stormwater capacity analysis for doctor’s branch watershed · 2015. 3. 18. · 16 n. quincy st....

Lee Hwy

Arlington Blvd

395

66

Palisades

PimmitRun

LittlePimmit Run,

Mainstem

Stohman'sRun

GulfBranch

DonaldsonRun

LittlePimmit Run,E. Branch

Pimmit RunTributary

LittlePimmit Run,W. Branch

RixeyBranch

WindyRun

SpoutRun

Four MileRun, UpperMainstem 1

ColonialVillageBranch

Rosslyn

CrossmanRun

WestoverBranch

LubberRun

TorreysonRun

RockyRun

Cemetery/PentagonFour Mile

Run, UpperMainstem 2

Lower LongBranch

Doctor'sBranch

UpperLong

Branch

NationalAirport

ArlingtonForestBranch

RoachesRun

Four MileRun, MiddleMainstem

ArlingtonBranch

VirginiaHighlandsBailey's

Branch

NauckBranch

Four MileRun, LowerMainstemLucky

Run

Fairlington/Bradlee

Potomac River

Stormwater Capacity Analysis for Doctor’s Branch Watershed

Prepared for Arlington County,

Virginia

January 29, 2013

15010 Conference Center Drive Suite 200

Chantilly, VA 20151

Stormwater Capacity Analysis for Doctor’s Branch Watershed: Contents This capacity analysis comprises the material below. Earlier technical memorandums—on GIS data gaps and stormwater capacity, for example—were presented as appendixes to subsequent memorandums; the outline below shows the relationship among the watershed-specific memorandums.

Design Iterations

Appendix A: Stormwater Capacity Analysis

Appendix A: GIS Data Gaps in the Storm Sewer System

Appendix B: Arlington County Soil Profile Assumptions Used in PCSWMM File

Appendix C: Hyetograph Data

Appendix B: GIS Updates from March 2012 and Rim Updates from September 2012

Design Iterations

1

T E C H N I C A L M E M O R A N D U M

Stormwater Capacity Analysis for Doctor’s Branch Watershed: Design Iterations, Arlington County, Virginia PREPARED FOR: Arlington County, Virginia

PREPARED BY: CH2M HILL

COPIES: Tara Ajello/CH2M HILL Rita Fordiani/CH2M HILL

DATE: January 29, 2013

PROJECT NUMBER: 240033.T5.DB.04.01

Contents Executive Summary ............................................................................................................................ 5 1 Introduction and Project Objectives ..................................................................................... 6 2 Background ................................................................................................................................ 6

2.1 Doctor’s Branch Outfall ................................................................................................... 6 2.2 Existing System Versus Modeled System ................................................................... 11 2.3 Data Sources and Review ............................................................................................. 12 2.4 Hydrologic and Hydraulic Modeling ......................................................................... 17

3 Technical Approach ............................................................................................................... 17 4 Results ....................................................................................................................................... 18

4.1 PCSWMM Terminology ................................................................................................ 18 1.2 Doctor’s Branch Culverts .............................................................................................. 19 4.3 June 2006 Event .............................................................................................................. 19 4.4 10yr-24hr SCS Type II Storm ........................................................................................ 53

5 Summary ................................................................................................................................ 109

Appendixes

A Stormwater Capacity Analysis for Doctor’s Branch Watershed, Arlington County, Virginia (Task 2)

B GIS Updates from March 2012 and Rim Updates from September 2012

Tables

1 Comparison of Existing Doctor’s Branch Stormwater System and Modeled System ... 11 2 June 2006 Storm Event: Final Iteration Results Summary ................................................. 21 3 10yr-24hr SCS Type II Storm Event: Final Iteration Results Summary ............................ 55

STORMWATER CAPACITY ANALYSIS FOR DOCTOR’S BRANCH WATERSHED: DESIGN ITERATIONS, ARLINGTON COUNTY, VIRGINIA

2

Figures

1 June 2006 Storm .......................................................................................................................... 7 2 10yr-24hr Storm .......................................................................................................................... 9 3 Existing Stormwater Collection System ................................................................................ 13 4 Modeled Stormwater Collection System .............................................................................. 15 5 Recommended Additional Capacity for the June 2006 Storm ........................................... 33 6 5th St. N. from N. Pollard St. to N. Oakland St. for the June 2006 Storm Event ............. 35 7 N. Oakland St. from 5th St. N. to 2nd St. N. (West Branch) for the June 2006 Storm

Event .......................................................................................................................................... 37 8 S. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. for the June 2006 Storm

Event .......................................................................................................................................... 39 9 N. Thomas St. North of Arlington Blvd. for the June 2006 Storm Event .......................... 41 10 5th Rd. S. from S. Jackson St. to S. Glebe Rd. for the June 2006 Storm Event .................. 43 11 S. Glebe Rd. from 6th St. S. to S. Oakland St. and 3rd St. S. for the June 2006 Storm

Event .......................................................................................................................................... 45 12 S. Old Glebe Rd. from 2nd St. S. to S. Glebe Rd. for the June 2006 Storm Event ............ 47 13 Columbia Pike to S. Quincy St. for the June 2006 Storm Event ......................................... 49 14 S. Quincy St. to S. George Mason Dr. and 12th Rd. S. for the June 2006 Storm Event ... 51 15 Recommended Additional Capacity for the 10yr-24hr Storm ........................................... 67 16 N. Quincy St. and 5th Rd. N. to 5th St. N. and N. Pollard St. for the 10yr-24hr Event .. 69 17 5th St. N. from N. Pollard St. to N. Oakland St. for the 10yr-24hr Storm Event ............. 71 18 N. Oakland St. from 5th St. N. to 2nd St. N. (West Branch) for the 10yr-24hr Storm

Event .......................................................................................................................................... 73 19 N. Oakland St. and N. Pershing Dr. to S. Glebe Rd. and 1st Rd. S. for the 10yr-24hr

Storm Event ............................................................................................................................... 75 20 S. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. for the 10yr-24hr Storm

Event .......................................................................................................................................... 77 21 N. Thomas St. North of Arlington Blvd. for the 10yr-24hr Storm Event .......................... 79 22 S. Glebe Rd. from 6th St. S. to S. Oakland St. and 3rd St. S. for the 10yr-24hr Storm

Event .......................................................................................................................................... 81 23 S. Oakland St. and 3rd St S. to South of National Foreign Affairs Training Center for

the 10yr-24hr Storm Event ...................................................................................................... 83 24 S. George Mason Dr. from Arlington Blvd. to 6th St S. for the 10yr-24hr Storm

Event .......................................................................................................................................... 85 25 S. George Mason Dr. from 4th St. S. to 6th St. S. for the 10yr-24hr Storm Event ............ 87 26 S. George Mason Dr. and 4th St. S. to South of National Foreign Affairs Training

Center for the 10yr-24hr Storm Event ................................................................................... 89 27 South of National Foreign Affairs Training Center to S. George Mason Dr. and 12th

Rd. S. for the 10yr-24hr Storm Event ..................................................................................... 91 28 8th St. S. from S. George Mason Dr. to Four Mile Run for the 10yr-24hr Storm

Event .......................................................................................................................................... 93 29 9th St. S. and S. Monroe St. to West of S. Oakland St. and Columbia Pike for the 10yr-

24hr Storm Event ...................................................................................................................... 95 30 Columbia Pike to S. Quincy St. for the 10yr-24hr Storm Event ......................................... 97 31 S. Quincy St. to S. George Mason Rd. and 12th Rd. S. for the 10yr-24hr Storm Event ... 99 32 S. Pollard St. and 14th St. S. to S. Quincy St. for the 10yr-24hr Storm Event ................. 101


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33 S. Quincy St. and 13th St. S. to S. Quebec St. Cul-de-Sac for the 10yr-24hr Storm Event ........................................................................................................................................ 103

34 S. George Mason Dr. from 12th Rd. S. to south of 13th Rd. S. for the 10yr-24hr Storm Event ........................................................................................................................................ 105

35 South of S. George Mason Dr. and 13th Rd. S. to Four Mile Run Outfall for the 10yr-24hr Storm Event ................................................................................................................... 107


5

Executive Summary The purpose of this project is to provide a program that will analyze storm sewer capacity issues, identify problem areas, develop and prioritize solutions, and provide support for public outreach and education. The project is being implemented in phases by watershed.

This technical memorandum (TM) focuses on the development of design solutions for the Doctor’s Branch watershed. It summarizes the County’s existing storm sewer system and the hydraulic model developed in Task 2, and describes the technical approach to and results from the design iteration model runs.

The hydraulic model developed in Task 2 of this project predicts that approximately 49 percent of the Doctor’s Branch watershed system is experiencing capacity limitations during the June 2006 storm event, and approximately 81 percent is experiencing capacity limitations during the 10-year, 24-hour (10yr-24hr) SCS Type II storm. Plan views of the conduits experiencing capacity limitations are provided in Figure 1 and Figure 2.The objective of this portion of the study is to identify design solutions to eliminate flooding in the model for these two storm events. This is accomplished by iteratively adjusting the capacity of the system as needed, including adding additional barrels of the same diameter alongside existing pipes, adding parallel pipe systems of differing sizes, increasing existing pipe diameters, and then running the hydraulic model. When a parallel pipe is added, all hydraulic parameters except for size match the existing pipe.

The solution identified to eliminate flooding during the June 2006 event requires adding additional capacity to 3,243 linear feet (LF) of pipe in Doctor’s Branch. This equates to approximately 9 percent of the modeled system. The changes required to eliminate flooding during the 10yr-24hr SCS Type II storm are more extensive. The final solution identified for the 10yr-24hr SCS Type II storm requires changes to approximately 13,783 LF of pipe. These changes affect over 40 percent of the modeled system in Doctor’s Branch.

The hydraulic modeling results presented in this TM should be reviewed with the understanding that flooding was alleviated by adding conveyance capacity as described above (see Figure 5 and Figure 15) and that the results presented are from a modeling perspective only. While flooding was eliminated from the model, practically, the risk of flooding is never completely eliminated. All of the assumptions should be verified and adjusted as necessary during the design phase. All other parameters (e.g., slope, inverts, losses, and storage nodes) were left unaltered from the hydraulic model developed in Task 2, except as described in Section 2.3.


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1 Introduction and Project Objectives The work described in this TM is one of the elements of a storm sewer capacity analysis project. In discussions with representatives from Arlington County, it is understood that the County is undertaking a larger effort to update and combine the 1996 Storm Water Master Plan and the 2001 Watershed Management Plan. This TM addresses the final task (Task 4) of suggesting design solutions to the capacity problems previously identified in the modeling in Task 2 of the overall project.

2 Background 2.1 Doctor’s Branch Outfall As discussed in the Task 2 TM, “Stormwater Capacity Analysis for Doctor’s Branch Watershed, Arlington County, Virginia,” the outfall for modeling purposes is considered the Doctor’s Branch natural stream channel southeast of the intersection of Four Mile Run Drive and S George Mason Drive. This is discussed in greater detail in the Task 2 TM (Appendix A).

FIGURE 1June 2006 StormDoctor's Branch WatershedArlington County Storm Capacity Analysis

H:\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE1_CONVEYANCE_CAP_JUNE_2006_STORM.MXD FCAIN 8/9/2012 3:53:30 PM

VICINITY MAP

N Fillmore St

N Pershing DrWilson Blvd

N George Mason

Dr

N Carlin Springs

Rd

S Cou rt House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S Geor

ge Maso

n Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendFloodedInsufficient FreeboardSurchargedSufficient Conveyance CapacityStreamsRoadsModeled (Revised) Watershed Boundary

0 1,200600

Feet

FIGURE 210-yr 24-hr StormDoctor's Branch WatershedArlington County Storm Capacity Analysis

\\ORION\PROJ\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE2_CONVEYANCE_CAP_10YR_24FR_STORM.MXD FCAIN 8/9/2012 4:23:06 PM

VICINITY MAP

N Fillmore St


N George Mason

Dr

N Carlin Springs

Rd

S Cou rt House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S Geor

ge Maso

n Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendFloodedInsufficient FreeboardSurchargedSufficient Conveyance CapcityStreamsRoadsModeled (Revised) Watershed Boundary

0 1,200600

Feet


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2.2 Existing System Versus Modeled System The stormwater collection system elements include the following:

Closed conduits, such as gravity sewers and culverts Stream channel segments and ditches (not modeled) Drainage inlets and junctions, such as roadside curb inlets, manholes, catchbasins, and

yard and grate inlets

Elements of the ArcGIS existing stormwater collection system and the corresponding stormwater model developed for the Doctor’s Branch watershed are summarized in Table 1. The modeling effort includes the storm sewer network of pipes 36 inches in diameter and larger. The table reflects updated GIS information provided by the County in March 2012. This is discussed in greater detail in Section 2.3.

TABLE 1 Comparison of Existing Doctor’s Branch Stormwater System and Modeled System

Stormwater System Element Existing Modeled

Drainage area (acres) 888 886

Number of conveyance segments in stormwater systema 1,391 286

Total length of conveyance segments in stormwater system (linear feet)b

115,926 34,630

Size range (in.)c 4–96 15–96

Number of circular pipe segments 1,312 228

Number of noncircular pipe segments 37 37

Number of stream channel and ditch segments 42 21

Total length of stream channel segments (linear feet) 5,040 4,134

Number of other segments 0 0

Total length of other segments (linear feet) 0 0

Total inlets/ junctions/ end points (model nodes) 1,382 268

Catchbasins 647 44

Manholes 411 159

Yard inlets 46 5

Grate inlets 106 13

End walls 37 12

Junction chambers 41 33


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TABLE 1 (CONTINUED) Comparison of Existing Doctor’s Branch Stormwater System and Modeled System

Stormwater System Element Existing Modeled

Detention outlets 34 0

Unknown types of nodes 60 2 aSegments include circular pipes, box culverts, elliptical pipes, ditches, and streams. bIncludes streams and ditches. For purposes of identifying design solutions, 338 feet of culvert was converted to stream, as described in Section 4.2. cModeling scope is limited to stormwater conveyance system pipes 36 inches in diameter and larger. Smaller-diameter pipes are included if they convey flows from pipes 36 inches in diameter and larger or if they are part of a multipipe system that has a combined effective diameter of 36 inches or larger Further review of the as-built drawings shows that the parallel pipe system between nodes 11468 and 11906 was abandoned. Therefore, it was removed from the modeled pipe network.

Figure 3 shows the existing stormwater collection system in the Doctor’s Branch watershed; Figure 4 shows the modeled system.

2.3 Data Sources and Review Arlington County provided storm drainage network data in ESRI ArcGIS format, as-built drawings, and initial base layers (GIS shapefiles); the final ArcGIS PGDB (personal geodatabase) was delivered to CH2M HILL in June 2011.

The final data for the Doctor’s Branch watershed model were evaluated for quality. CH2M HILL found 271 data gaps or anomalies. A data gaps TM detailing the suggested assumptions to fill in the gaps was prepared for the County in November 2011 and is included as an appendix to the Task 2 TM (which is itself included as Appendix A here). These data gaps were addressed prior to conducting the capacity analysis modeling.

Updated GIS information was provided by the County in March 2012. This information was incorporated into the design solutions modeling effort where appropriate and as documented in Appendix B.

Updated contour data were provided by the County in September 2012. An analysis was conducted to determine the differences between the rim elevations originally used in the model and new rim elevations based on the newly provided contour data. Rim elevations that differed by more than 2 feet were reviewed and revised as appropriate. This information is documented in Appendix B.

FIGURE 3Existing Stormwater Collection SystemDoctor's Branch WatershedArlington County Storm Capacity Analysis

\\ORION\PROJ\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE3_EXISTING_STORMWATER_COLLECTION_SYSTEM.MXD FCAIN 8/9/2012 4:49:47 PM

VICINITY MAP

N Fillmore St


N George Mason

Dr

N Carlin Springs

Rd

S Court House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S George Mason Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendStormwater JunctionsStormwater Mains ≥ 36"Stormwater Mains < 36"StreamsRoadsOriginal Watershed Boundary

0 1,200600Feet

FIGURE 4Modeled Stormwater Collection SystemDoctor's Branch WatershedArlington County Storm Capacity Analysis

H:\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE4_MODELED_STORMWATER_COLLECTION_SYSTEM.MXD FCAIN 8/9/2012 3:56:30 PM

VICINITY MAP

N Fillmore St


N George Mason

Dr

N Carlin Springs

Rd

S Cou rt House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S Geor

ge Maso

n Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendModeled Stormwater JunctionsModeled Stormwater Mains ≥ 36"Modeled Stormwater Mains < 36"StreamsRoadsModeled (Revised) Watershed Boundary

0 1,200600Feet


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2.4 Hydrologic and Hydraulic Modeling The hydrologic modeling task includes several steps: defining subwatershed boundaries, identifying hydrologic node connections, estimating hydrologic parameters for each subwatershed, and identifying rainfall distributions to analyze. ArcHydro Tools 9.2 and HEC-GeoHMS were used to delineate the subwatersheds and determine hydrologic parameters. The County chose two events for these modeling activities: the June 2006 storm event and the 10yr-24hr SCS Type II distribution.

The hydraulic modeling task includes three steps: (1) importing the stormwater network and physical data into PCSWMM version 2011, the stormwater management model selected for this project; (2) defining the boundary conditions for each hydrologic scenario; and (3) evaluating the hydraulic performance of the stormwater drainage system for the two storm event scenarios. Figure 1 and Figure 2 identify the areas from the Task 2 capacity analysis TM (Appendix A) where there was flooding in the June 2006 storm and the SCS Type II 10yr-24hr storm, respectively.

3 Technical Approach The model developed during Task 2 using the methodology described in Section 2.4 served as the basis for the iterative design modeling described in this TM. Design iterations were run for the June 2006 and the 10yr-24hr SCS Type II storms. The goal of Task 4 is to eliminate all flooding and rim conditions in the existing conditions model, but not necessarily insufficient freeboard (less than 1 foot of separation between the ground elevation and the hydraulic grade line, or HGL) or surcharge conditions. The general objective is to strategically add additional barrels or parallel pipes to the existing system. For convention, adding an additional barrel is adding an identical conduit (identical for every parameter: size, slope, etc.); adding a parallel pipe is adding a conduit that differs from the existing system, typically by having a different size or other parameter, such as slope. The following approach was used to optimize the capacity needed to eliminate system flooding:

1. Start with the base model that includes storage in the most-upstream nodes as developed in the Task 2 capacity analysis. It is assumed that capacity issues in the minor systems will be addressed and that the flows entering the modeled system should remain as currently modeled.

2. Add pipe barrels (identical conduits). For reconstructing existing sewer systems, it is often easier to expand a system either vertically or horizontally. Arlington County has requested that we first consider horizontal expansion by adding an additional barrel or parallel pipe to increase conveyance of the existing system. Pipe barrels were added according to the following:

Connect additional barrels to existing manhole structures. Start with an equivalent diameter in the flooded area. Match existing inverts to ensure hydraulic continuity at the downstream end of each modified section. If multiple barrels already exist, the lowest invert should be used for any added barrels.

If too little or too much capacity is provided by the additional barrel, change the additional barrel to a parallel conduit and increase or decrease the diameter as


18

needed. Avoid altering the existing system. If the diameter of the parallel conduit required is 12 inches or smaller, then increasing the existing system diameter may be considered instead.

Do not add additional model nodes unless absolutely necessary.

3. Begin adding pipe barrels/parallel conduits immediately downstream of a flooded node or conduit and work upstream. Try not to exceed the diameter of the most downstream conduit. Try to minimize diameter changes and work only as far upstream as needed for the flooded segment.

4. Do not be concerned about minimum cover beyond a minimum of at least 3 inches. However, do check pipe daylighting; make a round pipe rectangular as needed. As pipe size is increased, examine any downstream stream cross sections to ensure no flow is lost; if it is, consider extending the cross-section geometry based on contours.

4 Results 4.1 PCSWMM Terminology PCSWMM displays some information on its profile graphics depending how much space is available on the profile. For example, the date and time will not always appear on longer lengths of network because there is more information that is needed to be displayed. The following list is terminology that PCSWMM uses to label the profiles seen below:

Number displayed at the top of the figure: conduit identification number (Conduit ID)

Number displayed at the bottom of the figure: junction identification number (Junction ID)

Date and time: an arbitrary number used for running the model over a specified length of time (sometimes displayed in model output

Red dot at junction rim: signifies flooding at a node in the existing model

Number directly below pipe segments: diameter in feet followed by number of barrels in parentheses

Vertical axis provided in feet based on NAVD88 datum

Horizontal axis provided in feet

Index map: blue highlighted pipe segment on index map is displayed in profile view

Sewer system profiles were generated as a result of the iterative modeling and include profiles of the existing system, the final model design solution, and in some cases a final model design parallel solution. Table 2 and Table 3 provide the final model flow rates. These flow rates sum the final and parallel systems.

The pipe flow depth information provided in Table 2 and Table 3 represents maximum flow depths reported by the model. The corresponding figures are graphical representations of approximate flow depths; therefore, refer to the tables for the most precise information.


19

4.2 Doctor’s Branch Culverts In Doctor’s Branch, two locations immediately upstream of culverts indicated flooding in the model which are not believed to flood during storm events. The culverts are shown on Figure 4 and are located at

8th St. S. east of S. George Mason Dr. (8th St. culvert) 16th St. S. west of S. Taylor St. (16th St. culvert)

The culverts were restricting the flow and causing the flooding. The culverts are short (less than 70 feet long); therefore, to continue the modeling effort and retain the flooded volumes in the stream, these two culverts were removed and replaced with stream sections.

With the additional flows conveyed through the upstream sewer network, this modification was not adequate to convey the 10-year storm event at the 8th St. culvert location, and a flood volume of 0.85 million gallons was noted. To contain this flood volume in the system, a storage node was added at this location.

These culverts should be analyzed separately for final pipe sizes and may require upsizing.

4.3 June 2006 Event For the June 2006 event, capacity was added to 31 pipes (3,243 LF of pipe in total). This equates to approximately 9 percent of the modeled pipe network in Doctor’s Branch.

Changes to diameter and the existing and resulting flows are summarized in Table 2. A map showing the June 2006 storm upgrade locations throughout the watershed is included in Figure 5. Profiles showing the existing conditions and final results are shown in Figure 6 through Figure 14. Profiles were displayed only for segments of the stormwater network where any of the following conditions were met:

Pipe size was increased An identical barrel was added to the system An additional pipe was added to the system

The existing model profile depicts the peak water surface elevation with solid blue fill and peak HGL with a dark blue line. The HGL represents the sum of the pressure head and the elevation head along the profile. Flooded nodes in the existing condition model are annotated with a red dot behind the junction rim. The final profile also displays the existing system HGL with a dark green line for reference.


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TABLE 2 June 2006 Storm Event: Final Iteration Results Summary

Conduit ID

Node ID Length

(ft)

Size (Diameter or H × W) (ft) No. of Barrels Additional Pipe

Equivalent Cross-Sectional Area (ft2) Existing HGL Final HGL Flow (cfs)

US DS Existing Final Existing Final Model ID Diameter (ft) Existing Final US (ft) DS (ft) US (ft) DS (ft) Existing Final

N. Quincy St. and 5th Rd. N. to 5th St. N. and N. Pollard St.

23813 23810 23811 40.2 3.17×2a 3.17×2a 1 1 5.0 5.0 3.5 4.1 2.6 3.0 15.7 9.2

23818 23811 23816 284.6 3.08×2a 3.08×2a 1 1 4.8 4.8 4.1 4.9 3.0 4.6 16.0 8.5

23820 23816 11278 17.3 2.25 2.25 1 1 4.0 4.0 4.9 4.2 4.6 2.5 33.5 36.5

10443 11278 11299 21.2 3 3 1 1 7.1 7.1 4.2 5.2 2.5 2.1 33.2 36.5

24909 11299 24672 124.4 3 3 1 1 7.1 7.1 5.2 5.6 2.1 2.8 33.2 36.0

24910 24672 11413 51.7 3 3 1 1 7.1 7.1 5.6 5.7 2.8 3.3 30.7 35.6

10445 11413 11480 89.6 3 3 1 1 7.1 7.1 5.7 5.0 3.3 2.9 30.8 35.8

10446 11480 11578 133.8 3 3 1 1 7.1 7.1 5.0 5.7 2.9 5.0 30.8 36.3

10447 11578 11595 28.7 3 3 1 1 7.1 7.1 5.7 6.2 5.0 5.1 47.1 56.6

25140 11595 24901 140.5 3 3 1 1 7.1 7.1 6.2 5.9 5.1 1.7 52.8 63.6

5th St. N. from N. Pollard St. to N. Oakland St. (Figure 6, profile continues on Figure 7)

25141 24901 11554 275.8 3 3 1 2 7.1 14.1 5.9 4.8 1.7 1.7 52.8 63.7

17426 11554 11549 30.9 3 3 1 2 7.1 14.1 4.8 5.2 1.7 1.6 66.1 78.9

17427 11549 11519 188.8 3 3 1 2 7.1 14.1 5.2 6.1 1.6 1.9 66.1 78.9

10460 11519 11457 241.1 3 3 1 2 7.1 14.1 6.1 4.8 1.9 3.9 66.1 78.9

10461 11457 11464 9.0 3 3 1 2 7.1 14.1 4.8 4.4 3.9 3.1 46.6 89.8

10462 11464 11471 43.6 3 3 1 2 7.1 14.1 4.4 5.3 3.1 4.8 64.9 115.5

17431 11471 11479 13.5 2 2 1 2 3.1 6.3 5.3 2.4 4.8 3.8 40.8 100.7

N. Oakland St. from 5th St. N. to 2nd St. N. (West Branch) (Figure 7)

10463 11471 11706 345.2 2.25 2.25 1 1 4.0 4.0 5.3 7.8 4.8 4.9 24.2 14.7

10464 11706 11881 291.8 2.5 2.5 1 1 4.9 4.9 7.8 6.5 4.9 4.4 36.4 31.7

10465 11881 11915 52.5 2.5 2.5 1 1 4.9 4.9 6.5 5.8 4.4 4.1 36.4 31.8

17510 11915 11951 39.8 2.5 2.5 1 1 4.9 4.9 5.8 5.4 4.1 3.9 36.4 31.8

17508 11951 11969 25.1 2.5 2.5 1 1 4.9 4.9 5.4 5.1 3.9 3.9 36.5 31.8

10598 11969 11979 19.1 2.5 2.5 1 1 4.9 4.9 5.1 4.7 3.9 3.9 36.6 31.8

10599 11979 11984 33.5 2.5 2.5 1 1 4.9 4.9 4.7 2.6 3.9 3.2 59.3 49.6

17516 11984 12089 142.3 4.5 4.5 1 1 15.9 15.9 2.6 3.2 3.2 3.5 133.1 174.0

17493 12089 12132 52.8 4.5 4.5 1 1 15.9 15.9 3.2 3.2 3.5 3.3 142.7 170.5


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TABLE 2 (CONTINUED) June 2006 Storm Event: Final Iteration Results Summary

Conduit ID

Node ID Length

(ft)




10600 12132 12269 213.8 4.5 4.5 1 1 15.9 15.9 3.2 3.6 3.3 3.8 143.0 170.5

17517 12269 12468 249.9 4.5 4.5 1 1 15.9 15.9 3.6 4.1 3.8 5.0 158.4 184.6

17506 12468 12547 134.6 4.5 4.5 1 2 15.9 31.8 4.1 4.2 5.0 5.9 157.7 183.4

17507 12547 12590 98.3 4.5 4.5 1 1 15.9 15.9 4.2 4.0 5.9 5.0 164.7 190.2

10601 12590 12610 54.7 4.5 4.5 1 1 15.9 15.9 4.0 4.1 5.0 4.5 164.7 190.2

N. Oakland St. from 5th Rd. N. to N. Pershing Dr. (East Branch)

10476 11465 11479 21.6 3.5 3.5 1 1 9.6 9.6 1.9 2.4 2.8 3.8 25.4 25.3

10477 11479 11701 335.5 4.5 4.5 1 1 15.9 15.9 2.4 2.2 3.8 3.1 65.9 125.1

10478 11701 11940 378.5 4.5 4.5 1 1 15.9 15.9 2.2 1.7 3.1 2.3 75.3 124.6

10613 11940 11984 64.2 3.67×6a 3.67×6a 1 1 17.3 17.3 1.7 2.6 2.3 3.2 75.4 124.6

10503 11706 11701 13.8 1.25 1.25 1 1 1.2 1.2 7.8 2.2 4.9 3.1 10.5 0.0

5th St. N. and N. Monroe St. to N. Oakland St. and N. Pershing Dr.

20873 11274 11468 301.8 4 4 1 1 12.6 12.6 2.8 2.5 2.8 2.5 59.1 59.1

20874 11468 11620 234.9 4 4 1 1 12.6 12.6 2.5 2.8 2.5 2.8 58.4 58.4

10482 11620 11650 35.5 4 4 1 1 12.6 12.6 2.8 3.1 2.8 3.1 58.4 58.4

10484 11650 11739 218.6 4 4 1 1 12.6 12.6 3.1 1.8 3.1 1.8 71.1 71.1

25144 11739 24902 268.9 4 4 1 1 12.6 12.6 1.8 2.0 1.8 2.0 71.2 71.2

25145 24902 11906 234.3 4 4 1 1 12.6 12.6 2.0 3.8 2.0 3.8 71.3 71.3

17440 11906 11920 33.6 4 4 1 1 12.6 12.6 3.8 4.0 3.8 4.0 67.9 67.8

10485 11920 11929 13.0 4 4 1 1 12.6 12.6 4.0 4.0 4.0 4.0 67.9 67.8

10609 11929 11946 19.7 4 4 1 1 12.6 12.6 4.0 3.8 4.0 3.8 67.9 67.8

10610 11946 11978 52.0 4 4 1 1 12.6 12.6 3.8 1.9 3.8 1.9 67.9 67.8

N. Oakland St. and N. Pershing Dr. (Existing Parallel System)

17441 11906 11931 34.7 1.5 1.5 1 1 1.8 1.8 3.8 2.5 3.8 2.5 9.3 9.3

17442 11906 11931 33.9 1.75 1.75 1 1 2.4 2.4 3.8 2.5 3.8 2.5 13.1 13.1

17443 11931 11949 23.2 2.5 2.5 1 1 4.9 4.9 2.5 1.9 2.5 1.9 22.4 22.4

10611 11949 11978 50.1 2.5 2.5 1 1 4.9 4.9 1.9 1.9 1.9 1.9 22.4 22.4


23


Conduit ID

Node ID Length

(ft)




N. Oakland St. and N. Pershing Dr. to S. Glebe Rd. and 1st Rd. S.

10603 11978 12080 140.7 4 4 1 1 12.6 12.6 1.9 2.5 1.9 2.7 90.3 90.3

10604 12080 12262 261.1 4 4 1 1 12.6 12.6 2.5 2.8 2.7 3.0 104.2 116.6

17503 12262 12462 264.2 4 4 1 1 12.6 12.6 2.8 2.8 3.0 3.1 107.8 120.5

17504 12462 12610 275.2 4 4 1 1 12.6 12.6 2.8 4.1 3.1 4.5 113.8 126.2

10602 12610 12647 84.8 5.5 5.5 1 1 23.8 23.8 4.1 3.4 4.5 3.7 278.6 315.3

10663 12647 12756 253.0 5.5 5.5 1 1 23.8 23.8 3.4 5.1 3.7 5.1 301.5 333.3

10660 12756 12846 131.4 6 6 1 1 28.3 28.3 5.1 6.2 5.1 5.9 301.3 333.4

17614 12846 12940 112.9 6 6 1 1 28.3 28.3 6.2 4.6 5.9 4.9 301.3 333.3

17571 12940 12964 24.9 7 7 1 1 38.5 38.5 4.6 3.6 4.9 4.7 314.1 347.0

17617 12964 13154 257.9 7 7 1 1 38.5 38.5 3.6 8.1 4.7 11.7 368.9 397.6

22216 13154 13227 81.0 7 7 1 1 38.5 38.5 8.1 8.0 11.7 10.7 408.8 432.8

10670 13227 13497 292.4 7 7 1 1 38.5 38.5 8.0 8.7 10.7 10.3 400.9 432.8

25155 12080 12089 19.9 2.25 2.25 1 1 4.0 4.0 2.5 3.2 2.7 3.5 9.3 9.9

17501 12262 12269 13.5 2 2 1 1 3.1 3.1 2.8 3.6 3.0 3.8 3.6 4.2

S. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. (Figure 8)

17669 13785 13621 173.9 3 3 1 1 DB10 4 7.1 19.6 1.8 4.3 3.0 5.7 4.9 11.2

17671 13621 13497 178.7 3 3 1 1 7.1 7.1 4.3 8.7 5.7 10.3 7.9 21.4

17670 13497 13608 134.7 7 7 1 1 38.5 38.5 8.7 7.3 10.3 8.4 420.4 454.9

17672 13608 13742 124.1 7 7 1 1 38.5 38.5 7.3 6.9 8.4 7.8 420.8 454.9

10797 13742 13873 115.8 7 7 1 1 38.5 38.5 6.9 6.3 7.8 6.9 420.3 454.8

10730 13873 13909 56.3 7 7 1 1 38.5 38.5 6.3 4.3 6.9 4.6 420.3 454.3

10731 13909 14053 183.7 7 7 1 1 38.5 38.5 4.3 5.0 4.6 5.3 420.3 454.2

10732 14053 14247 273.1 7 7 1 1 38.5 38.5 5.0 10.3 5.3 10.2 420.1 454.7

10733 14247 14357 151.3 8 8 1 1 50.3 50.3 10.3 9.9 10.2 9.6 439.0 473.3

10734 14357 14377 24.5 8 8 1 1 50.3 50.3 9.9 9.3 9.6 9.3 439.0 473.4

N. Thomas St. North of Arlington Blvd. (Figure 9)

10637 13022 13035 15.6 3 3 1 1 7.1 7.1 3.3 2.8 3.1 2.6 63.6 64.7

20886 13035 13094 101.7 3 3 1 1 7.1 7.1 2.8 3.3 2.6 2.3 63.3 64.8


24


Conduit ID

Node ID Length

(ft)




10638 13094 13169 102.6 3 3 1 1 7.1 7.1 3.3 4.5 2.3 2.6 62.5 64.8

10639 13169 13240 122.1 3 3 1 1 7.1 7.1 4.5 4.0 2.6 2.6 62.5 64.7

10640 13240 13317 132.1 3.5 3.5 1 1 9.6 9.6 4.0 5.0 2.6 4.2 62.6 64.9

10641 13317 13323 13.3 3 3 1 1 7.1 7.1 5.0 6.7 4.2 6.1 62.6 65.0

10642 13323 13487 164.5 3 3 1 1 7.1 7.1 6.7 14.3 6.1 9.7 46.5 85.6

25443 13487 25169 62.4 3 3 1 2 7.1 14.1 14.3 14.5 9.7 8.4 46.5 85.6

25444 25169 13569 86.1 3 3 1 2 7.1 14.1 14.5 16.3 8.4 9.5 46.5 85.6

17654 13569 13616 41.5 3 3 1 2 7.1 14.1 16.3 14.5 9.5 9.4 83.4 140.2

North of National Foreign Affairs Training Center

17582 13394 13540 142.5 3 3 1 1 7.1 7.1 14.0 15.7 6.7 8.6 39.3 36.9

10727 13540 13569 30.4 3 3 1 1 7.1 7.1 15.7 16.3 8.6 9.5 39.3 36.9

South of National Foreign Affairs Training Center

11662 14607 14644 71.2 4 4 1 1 12.6 12.6 1.4 4.2 1.9 6.3 82.4 135.3

11665 14644 14677 51.5 4 4 1 1 12.6 12.6 4.2 5.0 6.3 5.5 82.2 135.2

6th St. S. from S. Irving St. to S. Glebe Rd.

25116 24883 24884 203.5 2×3.17 2×3.17 1 1 6.3 6.3 1.1 1.9 1.1 1.0 17.0 17.0

25117 24884 24885 332.1 2×3.17 2×3.17 1 1 6.3 6.3 1.9 4.6 1.0 1.5 17.5 16.6

25118 24885 24886 261.2 2.25×3.5 2.25×3.5 1 1 7.9 7.9 4.6 4.7 1.5 1.8 32.7 30.8

25119 24886 24887 81.2 2.25×3.5 2.25×3.5 1 1 7.9 7.9 4.7 4.8 1.8 2.1 32.5 30.4

25120 24887 24888 110.2 2.42×3.75 2.42×3.75 1 1 9.1 9.1 4.8 6.4 2.1 3.9 33.8 30.5

5th Rd. S. from S. Jackson St. to S. Glebe Rd. (Figure 10; profile connects to Figure 11)

24956 24759 24758 32.3 3 3 1 1 7.1 7.1 1.4 1.1 1.4 1.1 21.4 21.4

24955 24758 24757 127.0 3 3 1 1 7.1 7.1 1.1 2.4 1.1 2.1 21.5 21.5

24952 24757 24755 27.0 3 3 1 1 7.1 7.1 2.4 2.3 2.1 1.8 21.2 21.3

24953 24755 24756 193.4 3 3 1 1 7.1 7.1 2.3 2.8 1.8 1.2 20.6 21.1

24954 24756 14308 229.3 3 3 1 1 7.1 7.1 2.8 6.7 1.2 3.2 22.6 21.3

10787 14308 14313 21.6 3.5 3.5 1 2 9.6 19.2 6.7 6.8 3.2 3.7 22.6 27.9

10786 14313 14320 108.4 3.5 3.5 1 2 9.6 19.2 6.8 7.7 3.7 7.0 22.6 25.5


25


Conduit ID

Node ID Length

(ft)




S. Glebe Rd. from 6th St. S. to S. Oakland St. and 3rd St. S. (Figure 11)

25126 14587 24888 42.7 3.5 3.5 1 1 9.6 9.6 7.0 6.4 3.9 3.9 33.3 32.8

25127 24888 14540 41.5 3.5 3.5 1 1 9.6 9.6 6.4 6.7 3.9 3.9 64.3 67.0

11695 14540 14463 137.3 3.5 3.5 1 1 9.6 9.6 6.7 6.4 3.9 4.0 62.2 66.4

10780 14463 14320 255.4 3 3 1 1 7.1 7.1 6.4 7.7 4.0 7.0 59.2 65.0

24949 14320 24753 26.2 3.5 3.5 1 2 9.6 19.2 7.7 7.9 7.0 7.3 94.2 97.7

24950 24753 14202 229.0 3.5 3.5 1 2 9.6 19.2 7.9 7.8 7.3 8.8 94.2 97.0

10736 14202 14243 189.7 4.5 4.5 1 1 15.9 15.9 7.8 6.3 8.8 6.9 128.5 130.7

10791 14243 14267 107.2 4.5 4.5 1 1 15.9 15.9 6.3 5.9 6.9 6.3 128.5 130.7

10792 14267 14279 62.2 4.5 4.5 1 1 15.9 15.9 5.9 5.7 6.3 6.1 142.2 144.2

10737 14279 14318 165.4 4.5 4.5 1 1 15.9 15.9 5.7 4.0 6.1 4.1 142.2 144.2

10738 14318 14341 66.3 4.5 4.5 1 1 15.9 15.9 4.0 4.4 4.1 4.4 142.0 144.0

10739 14341 14364 35.9 4.5 4.5 1 1 15.9 15.9 4.4 6.0 4.4 5.9 141.8 143.9

17668 14364 14377 41.9 6 6 1 1 28.3 28.3 6.0 9.3 5.9 9.3 137.9 147.3

West of Arlington Blvd. and S. Hudson St. to 2nd St. S. and S. Old Glebe Rd.

17590 13026 13073 74.4 4 4 1 1 12.6 12.6 2.4 2.0 2.4 2.0 49.2 49.2

17591 13073 13287 268.7 4 4 1 1 12.6 12.6 2.0 2.4 2.0 2.4 49.1 49.1

17592 13287 13388 117.3 4.5 4.5 1 1 15.9 15.9 2.4 2.6 2.4 2.6 48.9 48.9

17593 13388 13472 70.3 4.5 4.5 1 1 15.9 15.9 2.6 2.6 2.6 2.6 48.8 48.8

17594 13472 13508 52.4 4.5 4.5 1 1 15.9 15.9 2.6 2.2 2.6 2.2 48.8 48.8

17662 13508 13600 129.6 4.5 4.5 1 1 15.9 15.9 2.2 2.2 2.2 2.2 48.8 48.8

25179 13600 24948 217.7 4.5 4.5 1 1 15.9 15.9 2.2 2.4 2.2 2.4 65.8 65.8

25180 24948 13750 155.3 4.5 4.5 1 1 15.9 15.9 2.4 3.7 2.4 3.7 65.8 65.8

10755 13750 13808 54.7 4.5 4.5 1 1 15.9 15.9 3.7 3.7 3.7 3.7 97.1 97.1

West of 2nd St. S. and S. Jackson St. to National Foreign Affairs Training Center Parking Lot

10766 13642 13789 368.4 3 3 1 1 7.1 7.1 1.5 1.6 1.5 1.6 23.5 23.5

10767 13789 13808 54.0 3 3 1 1 7.1 7.1 1.6 3.7 1.6 3.7 23.3 23.3

10756 13808 13911 108.7 4.5 4.5 1 1 15.9 15.9 3.7 2.0 3.7 2.0 106.6 106.5

10757 13911 14063 185.1 4.5 4.5 1 1 15.9 15.9 2.0 2.3 2.0 2.2 106.7 106.5


26


Conduit ID

Node ID Length

(ft)




24945 14063 14152 115.6 4.5 4.5 1 1 15.9 15.9 2.3 5.2 2.2 5.0 106.7 106.3

10760 14152 14212 103.0 5 5 1 1 19.6 19.6 5.2 5.9 5.0 5.7 106.8 106.1

10761 14212 14338 534.6 5 5 1 1 19.6 19.6 5.9 6.4 5.7 6.2 106.7 106.1

10762 14338 14362 41.2 5 5 1 1 19.6 19.6 6.4 6.3 6.2 6.1 106.7 106.1

10763 14362 14364 50.3 5 5 1 1 19.6 19.6 6.3 6.0 6.1 5.9 106.7 106.1

10764 14364 14397 47.0 4.5 4.5 1 1 15.9 15.9 6.0 2.9 5.9 2.8 116.7 110.2

21180 14397 14490 94.1 5 5 1 1 19.6 19.6 2.9 2.5 2.8 2.4 116.7 110.2

21177 14490 14668 316.4 5 5 1 1 19.6 19.6 2.5 1.7 2.4 1.7 121.6 115.0

S. Old Glebe Rd. from 2nd St. S. to S. Glebe Rd. (Figure 12; profile connects to Figure 11)

10770 13818 13808 27.9 3 3 1 1 7.1 7.1 1.5 3.7 1.5 3.7 13.5 13.6

10775 13818 13922 108.6 3 3 1 1 7.1 7.1 1.5 1.8 1.5 1.8 19.7 19.9

25035 13922 24787 77.0 3 3 1 1 7.1 7.1 1.8 2.5 1.8 2.6 19.5 19.4

25030 24787 14128 165.0 3 3 1 1 7.1 7.1 2.5 7.7 2.6 6.6 19.9 19.5

10778 14128 14138 27.0 3 3 1 1 7.1 7.1 7.7 7.9 6.6 7.4 19.9 19.5

10779 14138 14202 89.7 3 3 1 2 7.1 14.1 7.9 7.8 7.4 8.8 19.9 19.5

S. Oakland St. and 3rd St S. to South of National Foreign Affairs Training Center

11663 14377 14499 125.4 8 8 1 1 50.3 50.3 9.3 6.6 9.3 6.9 565.6 597.5

11661 14499 14542 81.5 8 8 1 1 50.3 50.3 6.6 5.5 6.9 5.8 565.6 597.5

11664 14542 14677 247.7 8 8 1 1 50.3 50.3 5.5 5.0 5.8 5.5 565.7 597.6

17728 14677 14904 451.9 8 8 1 1 50.3 50.3 5.0 6.9 5.5 7.6 641.1 715.2

21172 14904 15016 154.8 8 8 1 1 50.3 50.3 6.9 4.0 7.6 4.2 641.2 715.2

21168 15016 15031 13.9 Stream Stream 1 1 768.4 841.0

21169 15031 15479 663.5 Stream Stream 1 1 817.1 881.2

National Foreign Affairs Training Center Parking Lot to S. Quincy St. and 6th St S. (North Branch)

21179 14668 14688 37.3 5.5 5.5 1 1 23.8 23.8 1.7 1.6 1.7 1.6 63.2 59.8

21875 14688 14825 270.5 5.5 5.5 1 1 23.8 23.8 1.6 2.1 1.6 2.1 63.8 63.8

17730 14825 14916 158.2 5.5 5.5 1 1 23.8 23.8 2.1 2.2 2.1 2.2 66.2 66.2

17732 14677 14688 15.4 4 4 1 1 12.6 12.6 5.0 1.6 5.5 1.6 6.1 14.2


27


Conduit ID

Node ID Length

(ft)




National Foreign Affairs Training Center Parking Lot to S. Quincy St. and 6th St S. (South Branch)

21178 14668 14688 35.0 5 5 1 1 19.6 19.6 1.7 1.6 1.7 1.6 58.4 55.2

21874 14688 14825 269.1 5 5 1 1 19.6 19.6 1.6 2.1 1.6 2.1 64.2 64.2

17731 14825 14916 158.4 5 5 1 1 19.6 19.6 2.1 2.2 2.1 2.2 61.6 61.6

17717 14916 14991 112.9 6.9×6.7 6.9×6.7 1 1 46.2 46.2 2.2 2.1 2.2 2.2 127.7 127.8

21898 14991 15016 39.6 6.9×6.7 6.9×6.7 1 1 46.2 46.2 2.1 4.0 2.2 4.2 127.7 127.8

S. George Mason Dr. from Arlington Blvd. to 6th St S.

6896 13687 13788 85.0 3 3 1 1 7.1 7.1 0.7 0.6 0.7 0.6 7.6 7.6

6897 13788 13940 150.2 3 3 1 1 7.1 7.1 0.6 0.9 0.6 0.9 7.6 7.6

6898 13940 14099 241.0 3 3 1 1 7.1 7.1 0.9 2.3 0.9 2.3 15.9 15.9

25189 14099 24934 34.3 4 4 1 1 12.6 12.6 2.3 1.5 2.3 1.5 78.7 78.7

25190 24934 24935 129.2 4.5 4.5 1 1 15.9 15.9 1.5 1.5 1.5 1.5 78.8 78.8

25191 24935 24936 165.8 4.5 4.5 1 1 15.9 15.9 1.5 2.2 1.5 2.2 78.8 78.8

25195 24936 14717 510.9 4.5 4.5 1 1 15.9 15.9 2.2 2.1 2.2 2.1 77.4 77.4

25197 14717 24941 132.6 4.5 4.5 1 1 15.9 15.9 2.1 2.5 2.1 2.5 88.5 88.5

25200 24941 24942 63.7 4.5 4.5 1 1 15.9 15.9 2.5 2.9 2.5 2.9 88.5 88.5

25201 24942 24944 54.8 4.5 4.5 1 1 15.9 15.9 2.9 2.8 2.9 2.8 88.5 88.5

25202 24944 24945 83.1 4.5 4.5 1 1 15.9 15.9 2.8 2.5 2.8 2.5 88.6 88.6

25214 24945 14939 147.5 4.5 4.5 1 1 15.9 15.9 2.5 2.5 2.5 2.5 119.7 119.7

11635 14939 15127 221.5 3.5 3.5 1 1 9.6 9.6 2.5 2.6 2.5 2.6 119.9 119.9

11636 15127 15236 153.4 3.5 3.5 1 1 9.6 9.6 2.6 3.1 2.6 3.1 120.1 120.1

S. George Mason Dr. from 4th St. S. to 6th St. S.

21166 15056 15066 13.3 1.75 1.75 1 1 2.4 2.4 2.9 0.6 2.9 0.6 6.9 6.9

11642 15066 15149 173.5 1.75 1.75 1 1 2.4 2.4 0.6 0.7 0.6 0.7 6.9 6.9

11643 15149 15276 244.3 1.75 1.75 1 1 2.4 2.4 0.7 0.5 0.7 0.5 6.8 6.8

11743 15276 15308 72.4 1.75 1.75 1 1 2.4 2.4 0.5 3.7 0.5 3.7 6.8 6.8

S. George Mason Dr. and 4th St. S. to South of National Foreign Affairs Training Center

11639 15056 15058 53.8 2.25 2.25 1 1 4.0 4.0 2.9 1.7 2.9 1.7 30.9 30.9

11640 15058 15229 317.9 2.25 2.25 1 1 4.0 4.0 1.7 2.7 1.7 2.7 38.7 38.7


28


Conduit ID

Node ID Length

(ft)




11641 15229 15236 16.2 2.25 2.25 1 1 4.0 4.0 2.7 3.1 2.7 3.1 38.7 38.7

11637 15236 15272 58.0 4 4 1 1 12.6 12.6 3.1 3.5 3.1 3.5 157.3 157.3

11742 15272 15308 70.2 4 4 1 1 12.6 12.6 3.5 3.7 3.5 3.7 157.4 157.4

11744 15308 15348 148.0 4.5 4.5 1 1 15.9 15.9 3.7 1.5 3.7 1.5 180.4 180.4

21173 15348 15479 438.5 Stream Stream 1 1 179.6 179.6

South of National Foreign Affairs Training Center to S. George Mason Dr. and 12th Rd. S.

11745 15479 15750 364.9 Stream Stream 1 1 1084.4 1141.8

17773 15750 15861 143.7 Stream Stream 1 1 1084.9 1138.6

17772a 15861 15921 69.1 6 Stream 1 1 28.3 9.4 5.0 8.5 9.2 458.3 1124.3

17774 15921 16050 179.5 Stream Stream 1 1 959.7 1187.8

17769 16050 16159 162.2 Stream Stream 1 1 983.2 1193.9

25283 16159 16475 457.0 Stream Stream 1 1 1004.2 1203.4

17816 16475 16723 324.2 6×6 6×6 2 2 72.0 72.0 9.8 7.8 16.8 12.0 1006.4 1208.4

17814 16723 16730 11.4 6×6 6×6 2 2 72.0 72.0 7.8 6.8 12.0 11.0 1028.5 1225.2

17815 16730 16818 67.2 6×6 6×6 2 2 72.0 72.0 6.8 5.8 11.0 10.5 1039.6 1234.6

17914 16818 16980 216.4 6×7 6×7 2 2 84.0 84.0 5.8 5.1 10.5 9.4 1039.5 1234.6

17909 16980 17097 121.4 6×7 6×7 2 2 84.0 84.0 5.1 3.7 9.4 5.3 1039.3 1234.5

17910 17097 17159 104.2 6×7 6×7 2 2 84.0 84.0 3.7 4.4 5.3 7.9 1039.0 1233.3

17911 17159 17190 49.6 6×7 6×7 2 2 84.0 84.0 4.4 6.4 7.9 10.2 1073.9 1264.3

8th St. S. from S. George Mason Dr. to Four Mile Run

11716 15965 15922 160.2 3 3 1 1 7.1 7.1 1.7 4.6 1.9 6.5 67.1 66.8

11717 15922 15928 24.0 3 3 1 1 7.1 7.1 4.6 2.8 6.5 7.0 67.1 66.8

17775 15928 15921 17.5 Stream Stream 1 1 117.6 118.0

9th St. S. and S. Monroe St. to West of S. Oakland St. and Columbia Pike

11778 15787 15803 25.9 3 3 1 1 7.1 7.1 3.6 4.7 2.9 3.9 29.3 28.7

11772 15803 15860 53.3 3 3 1 1 7.1 7.1 4.7 6.0 3.9 4.6 53.7 55.8

11773 15860 15963 129.4 3 3 1 1 7.1 7.1 6.0 8.3 4.6 5.4 53.2 54.8

11873 15963 15999 105.1 3 3 1 1 7.1 7.1 8.3 6.7 5.4 5.2 53.2 53.2

11872 15999 16057 109.7 3 3 1 1 7.1 7.1 6.7 5.9 5.2 5.4 53.3 53.3


29


Conduit ID

Node ID Length

(ft)




17854 16057 16108 93.7 3 3 1 1 7.1 7.1 5.9 7.7 5.4 5.3 53.3 53.3

23682 16108 23714 32.9 3 3 1 1 7.1 7.1 7.7 7.2 5.3 4.1 53.3 53.3

23683 23714 16110 46.6 3 3 1 1 7.1 7.1 7.2 6.7 4.1 2.4 63.7 69.0

17847 16110 16130 110.4 3 3 1 1 7.1 7.1 6.7 11.8 2.4 8.6 65.8 69.4

17848 16130 16150 32.8 3 3 1 1 7.1 7.1 11.8 11.7 8.6 7.9 65.8 69.4

21240 16150 16153 6.8 3 3 1 1 7.1 7.1 11.7 12.1 7.9 8.0 65.9 69.5

21241 16153 16169 26.1 3.5 3.5 1 1 9.6 9.6 12.1 12.4 8.0 8.4 66.0 69.5

17866 16169 16264 193.6 3.5 3.5 1 1 9.6 9.6 12.4 11.7 8.4 8.6 86.5 90.0

17868 16264 16378 138.2 3.5 3.5 1 1 9.6 9.6 11.7 10.7 8.6 8.4 99.4 103.3

Columbia Pike to S. Quincy St. (Figure 13; profile continues on Figure 14)

17859 16387 16430 53.8 4×4 4×4 1 1 16.0 16.0 10.0 9.3 6.5 6.9 120.5 133.3

17869 16378 16387 10.1 4×4 4×4 1 1 16.0 16.0 10.7 10.0 8.4 6.5 94.7 103.2

17860 16430 16441 18.4 4×4 4×4 1 1 16.0 16.0 9.3 9.0 6.9 6.6 120.6 133.3

17855 16441 16493 163.6 3.5 3.5 1 1 9.6 9.6 9.0 13.0 6.6 3.9 134.3 154.9

17856 16493 16535 92.8 3.5 3.5 1 1 9.6 9.6 13.0 11.0 3.9 3.0 134.4 153.8

17857 16535 16698 222.6 3.5 3.5 1 1 DB01 2 9.6 12.8 11.0 18.5 3.0 15.8 134.3 161.6

21242 16698 16855 227.3 4 4 1 1 DB02 2 12.6 15.7 18.5 12.0 15.8 9.1 134.3 151.2

S. Quincy St. to S. George Mason Rd. and 12th Rd. S. (Figure 14)

11852 16855 16861 11.9 4 4 1 1 DB03 2 12.6 15.7 12.0 11.8 9.1 9.7 134.4 151.0

11853 16861 16866 14.3 4 4 1 1 DB04 2 12.6 15.7 11.8 11.7 9.7 8.9 114.3 151.0

11854 16866 16869 15.8 4 4 1 1 DB05 2 12.6 15.7 11.7 11.2 8.9 7.9 138.8 182.3

17940 16869 16964 190.2 4 4 1 1 DB06 3 12.6 19.6 11.2 10.0 7.9 7.5 157.9 205.8

17937 16964 17022 70.5 4 4 1 1 DB07 3 12.6 19.6 10.0 9.6 7.5 6.0 149.4 205.8

21252 17022 17074 56.5 4 4 1 1 DB08 3 12.6 19.6 9.6 9.5 6.0 5.2 149.4 205.8

21253 17074 17099 42.0 4 4 1 1 DB09 3 12.6 19.6 9.5 10.0 5.2 4.2 149.4 205.8

17934 17099 17085 134.1 5 5 1 2 19.6 39.3 10.0 7.5 4.2 6.6 261.4 334.4

17935 17085 17096 23.0 5.5 5.5 1 2 23.8 47.5 7.5 6.1 6.6 6.4 269.4 341.6

17936 17096 17178 120.4 5.5 5.5 1 2 23.8 47.5 6.1 5.8 6.4 7.7 270.0 341.1

17941 17178 17190 83.1 5.5 5.5 1 2 23.8 47.5 5.8 6.4 7.7 10.2 269.1 337.8


30


Conduit ID

Node ID Length

(ft)




S. Pollard St. and 14th St. S. to S. Quincy St. and 13th St. S. (West Branch)

17923 17535 17436 162.4 2.25 2.25 1 1 4.0 4.0 1.2 1.4 1.2 1.4 23.4 23.4

17938 17436 17405 42.2 2 2 1 1 3.1 3.1 1.4 1.5 1.4 1.5 19.8 19.8

11950 17405 17429 81.0 2 2 1 1 3.1 3.1 1.5 1.2 1.5 1.2 23.1 23.1

11951 17429 17336 178.6 2 2 1 1 3.1 3.1 1.2 1.2 1.2 1.2 23.1 23.1

11952 17336 17259 113.5 2 2 1 1 3.1 3.1 1.2 1.4 1.2 1.4 23.1 23.1

25235 17259 17272 50.2 2 2 1 1 3.1 3.1 1.4 1.1 1.4 1.1 8.8 8.8

11953 17272 17249 38.6 2 2 1 1 3.1 3.1 1.1 2.5 1.1 2.5 8.8 8.8

S. Pollard St. and 14th St. S. to S. Quincy St. and 13th St. S. (East Branch)

11930 17535 17436 160.0 2.25 2.25 1 1 4.0 4.0 1.2 1.4 1.2 1.4 24.7 24.7

17918 17436 17412 29.5 2.25 2.25 1 1 4.0 4.0 1.4 1.7 1.4 1.7 28.3 28.3

17919 17412 17404 9.9 2.25 2.25 1 1 4.0 4.0 1.7 1.2 1.7 1.2 31.4 31.4

11931 17404 17250 223.2 2.25 2.25 1 1 4.0 4.0 1.2 2.1 1.2 2.1 28.1 28.1

11932 17250 17235 20.7 2.25 2.25 1 1 4.0 4.0 2.1 1.5 2.1 1.5 28.0 28.0

11933 17235 17223 42.0 2.25 2.25 1 1 4.0 4.0 1.5 1.6 1.5 1.6 28.0 28.0

11934 17223 17210 49.0 2.5 2.5 1 1 4.9 4.9 1.6 1.7 1.6 1.7 28.0 28.0

11935 17210 17219 51.2 2.5 2.5 1 1 4.9 4.9 1.7 2.1 1.7 2.1 28.0 28.0

11936 17219 17237 71.8 3 3 1 1 7.1 7.1 2.1 2.0 2.1 2.0 46.2 46.2

11937 17237 17249 37.9 3 3 1 1 7.1 7.1 2.0 2.5 2.0 2.5 65.3 65.3

17939 17404 17405 8.4 2 2 1 1 3.1 3.1 1.2 1.5 1.2 1.5 3.4 3.4

17924 17259 17237 42.1 2 2 1 1 3.1 3.1 1.4 2.0 1.4 2.0 19.1 19.1

S. Quincy St. and 13th St. S. to S. Quebec St. Cul-de-sac

11938 17249 17230 51.8 3 3 1 1 7.1 7.1 2.5 2.3 2.5 2.0 74.1 74.1

11939 17230 17184 110.2 3 3 1 1 7.1 7.1 2.3 5.6 2.0 5.3 74.0 74.1

11940 17184 17109 148.9 3 3 1 1 7.1 7.1 5.6 2.3 5.3 2.3 94.7 95.0

17932 17109 17054 214.7 4 4 1 1 12.6 12.6 2.3 4.5 2.3 2.9 121.8 122.4

17933 17054 17099 158.8 4 4 1 1 12.6 12.6 4.5 10.0 2.9 4.2 126.6 128.7


31


Conduit ID

Node ID Length

(ft)




S. George Mason Dr. from 12th Rd. S. to south of 13th Rd. S.

17915 17190 17198 9.7 6×10 6×10 2 2 120.0 120.0 6.4 5.2 10.2 8.7 1331.7 1544.4

17944 17198 17390 271.0 6×10 6×10 2 2 120.0 120.0 5.2 6.7 8.7 9.2 1331.6 1544.4

17928 17390 17403 17.5 6×10 6×10 2 2 120.0 120.0 6.7 6.6 9.2 8.9 1333.6 1544.4

17929 17403 17509 151.4 6×10 6×10 2 2 120.0 120.0 6.6 6.6 8.9 8.4 1346.2 1557.1

25129 17509 17562 57.7 6×10 6×10 2 2 120.0 120.0 6.6 6.4 8.4 7.9 1348.3 1557.1

17942 17562 17717 186.5 6×10 6×10 2 2 120.0 120.0 6.4 7.2 7.9 8.2 1374.9 1587.8

13551 17717 17761 55.2 6×10 6×10 2 2 120.0 120.0 7.2 7.0 8.2 7.6 1374.8 1587.8

21418 17761 18036 331.4 6×10 6×10 2 2 120.0 120.0 7.0 8.3 7.6 8.0 1374.9 1587.8

13511 18036 18080 55.5 6×10 6×10 2 2 120.0 120.0 8.3 8.0 8.0 7.4 1395.6 1609.9

13512 18080 18120 48.8 6×10 6×10 2 2 120.0 120.0 8.0 6.1 7.4 4.1 1407.3 1622.4

13524 18120 18246 224.4 Stream Stream 1 1 1407.2 1623.6

13526 18246 18327 92.8 Stream Stream 1 1 1413.8 1630.7

13528 18327 18351 21.3 Stream Stream 1 1 1414.4 1631.0

13530 18351 18411 44.8 Stream Stream 1 1 1414.7 1631.3

13532 18411 18502 106.8 Stream Stream 1 1 1422.5 1639.5

South of S. George Mason Dr. and 13th Rd. S. to Four Mile Run Outfall

13664 18502 18581 112.5 Stream Stream 1 1 1422.7 1639.6

13643a 18581 18628 65.4 6 Stream 1 1 28.3 10.3 4.4 7.9 5.0 448.6 1644.9

13674 18628 18641 12.9 Stream Stream 1 1 1368.1 1644.9

13675 18641 18679 57.8 Stream Stream 1 1 1388.2 1662.8

13660 18679 18758 110.9 Stream Stream 1 1 1388.2 1662.5

13661 18758 18792 30.3 Stream Stream 1 1 1388.2 1661.6

21412 18792 18925 160.4 Stream Stream 1 1 1388.1 1659.9

25289 18925 25018 62.5 8×10 8×10 2 2 160.0 160.0 8.2 8.1 10.0 9.5 1388.9 1658.5

25290 25018 18977 24.2 8×10 8×10 2 2 160.0 160.0 8.1 8.0 9.5 9.2 1398.7 1649.0

21415 18977 18990 22.9 8×10 8×10 2 2 160.0 160.0 8.0 7.9 9.2 9.0 1411.3 1677.6

21416 18990 19005 54.0 8×10 8×10 2 2 160.0 160.0 7.9 7.4 9.0 8.3 1431.9 1695.2

18419 19005 19024 27.3 8×10 8×10 2 2 160.0 160.0 7.4 7.2 8.3 8.0 1431.9 1695.2


32


Conduit ID

Node ID Length

(ft)




18420 19024 19043 30.2 8×10 8×10 2 2 160.0 160.0 7.2 6.9 8.0 7.6 1431.9 1695.2

13642 19043 19064 18.9 8×10 8×10 2 2 160.0 160.0 6.9 5.3 7.6 5.7 1431.9 1695.2

21431 19064 19532 718.2 Stream Stream 1 1 1453.1 1712.1

US, upstream; DS, downstream. Note that cross-sectional area and HGL are not calculated for natural stream sections. The existing and final HGL data represent maximum node depths. a Irregularly shaped pipe, such as arch, elliptical.

H:\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE5_RECOMMENDED_ADDITIONAL_CAPACITY_JUNE_2006_STORM.MXD FCAIN 12/13/2012 10:05:42 AM

VICINITY MAP

N Fillmore St


N George Mason

Dr

N Carlin Springs

Rd

S Cou rt House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S Geor

ge Maso

n Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendModeled Stormwater Mains withRecommended Additional CapacityModeled Stormwater Mainswith Sufficient Existing CapacityStreamsRoadsModeled (Revised) Watershed Boundary

0 1,200600

Feet

FIGURE 5Recommended Additional Capacityfor the June 2006 StormDoctor's Branch WatershedArlington County Storm Capacity Analysis

FIGURE 6 - Doctor’s Branch5th St. N. from N. Pollard St. to N. Oakland St. for the June 2006 Storm Event

Existing Grade

FinalModel HGL

WBG120412151936WDC_DB_F6_25141

NOTES: = Flooded Junction in Existing Model #’(#) = Diameter (No. barrels) from Existing Model or Unchanged in Final Model#’(#) = Diameter (No. barrels) Updated Information in Final Model

ExistingModel HGL

24901

25141 17426 17427 10460 10462 1743110461

11549 11519 11457 11464 114791147111554

3’(2)3’(2)

3’(2)

3’(2)

3’(2)3’(2)

2’(2)

FIGURE 7 - Doctor’s BranchN. Oakland St. From 5th St. N. to 2nd St. N. (West Branch) for the June 2006 Storm Event

2.25’(1)

2.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F7_10463


Existing Grade

10463 17508 10598 10599 17516 17493 10600 17507 106011750617517175101046510464

4.5’(2)

11471 11881 11915 11951 11969 11979 121321208911984 12468 12547 12610125901226911706

2.5’(1)

FIGURE 8 - Doctor’s BranchS. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. for the June 2006 Storm Event

3’(1)

7’(1)

7’(1)

7’(1)

8’(1)8’(1)

7’(1)

7’(1)7’(1)

3’(1)

Existing Model HGL

Final Model HGL

WBG120412151936WDC_DB_F8_17669


ExistingGrade

17670 10797 10731 10732 10733 1073410730176721767117669

1362113785 13497 13608 13742 13909 14053 14247 14357 1437713873

Additional PipingSystem

4’ Additional Pipe

4’(1)

justin this is old �gure 9 and the one that i expect to get a replacement pro�le jpg from antonio that doesn’t have the DB10 as the �rst section, so this one will be replaced

FIGURE 9 - Doctor’s BranchN. Thomas St. North of Arlington Blvd. for the June 2006 Storm Event

3’(1)

3’(1)

3.5’(1)

3’(1)

3’(1)

3’(1)

3’(1)

Existing Model HGL

FinalModelHGL

WBG120412151936WDC_DB_F9_10637


Existing Grade

10637 10638 10640 10642 25443 25444 17654106411063920886

3’(2)

3’(2)

3’(2)

13022 13094 13169 13240 13323 13487 25169 13569 136161331713035

FIGURE 10 - Doctor’s Branch5th Rd. S. from Jackson St. to S. Glebe Rd. for the June 2006 Storm Event

3’(1)

3’(1)

3’(1)

3’(1)

3’(1)

Existing Model HGL

Final Model HGL

WBG120412151936WDC_DB_F10_24956


Existing Grade

24956 24953 1078610787249542495224955

3.5’(2)3.5’(2)

24759 24758 24757 24756 14308 14313 1432024755

FIGURE 11 - Doctor’s BranchS. Glebe Rd. and 6th St. S. to S. Oakland St. and 3rd St. S. for the June 2006 Storm Event

3.5’(1)3.5’(1) 3.5’(1)

3’(1)

4.5’(1)4.5’(1)

4.5’(1)4.5’(1)

4.5’(1)

4.5’(1)

6’(1)

ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F11_25216


Existing Grade

25126 10780 10736 10739 176681073810737107921079124950249491169525127

3.5’(2)3.5’(2)

14587 24888 14243 14364143411431814279142671420224753143201446314540 14377

FIGURE 12 - Doctor’s Branch

3’(1)

3’(1)

3’(1)

3’(1)3’(1)

ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F12_10770


Existing Grade

3’(2)

S. Old Glebe Rd. from 2nd St. S. to S. Glebe Rd. for the June 2006 Storm Event

10770 10775 25035 25030 10779

13808 13818 13922 24787 1420214138 14128

10778


4’x4’(1) 4’x4’(1)4’x4’(1)

3.5’(1)

3.5’(1)

3.5’(1)

ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F13_17869


Existing Grade

Additional Piping System




2’(1)

4’(1)2’(1)

Columbia Pike to S. Quincy St. for the June 2006 Storm Event

17869 17859 17855 17856 212421785717860

16378 16441 16493 1685516698165351643016387


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F14_11852


Existing Grade

5.5’(2)5.5’(2)

5.5’(2)



AdditionalPipingSystem

4’(1)3’(1)

4’(1)2’(1)

4’(1)3’(1) 4’(1)

3’(1) 4’(1)3’(1)

5’(2)

S. Quincy St. to S. George Mason Dr. and 12th Rd. S. for the June 2006 Storm Event

11852 21252 21253 1794117936179351793417937179401185411853

16855 17099 17190171781709617085170741702216964168691686616861



53

4.4 10yr-24hr SCS Type II Storm For the 10yr-24hr SCS Type II storm, capacity was added to 130 conduits (13,783 LF of pipe in total). This equates to approximately 40 percent of the modeled pipe network in Doctor’s Branch.

Changes to diameter and the existing and resulting flows are summarized in Table 3. A map showing the 10yr-24hr storm upgrade locations throughout the watershed is included in Figure 15. Profiles showing the existing conditions and final results are shown in Figure 16 through Figure 34. Profiles were displayed only for segments of the stormwater network where any of the following conditions were met:

Pipe size was increased An identical barrel was added to the system An additional pipe was added to the system

The existing model profile depicts the peak water surface elevation with solid blue fill and peak HGL with a dark blue line. The HGL represents the sum of the pressure head and the elevation head along the profile. Flooded nodes in the existing conditions model are annotated with a red dot behind the junction rim. The final profile displays the existing system HGL with a dark green line for reference.


55

TABLE 3 10yr-24hr SCS Type II Storm Event: Final Iteration Results Summary

Conduit ID

Node ID Length

(ft)




N. Quincy St. and 5th Rd. N. to 5th St. N. and N. Pollard St. (Figure 16; profile continues on Figure 17)

23813 23810 23811 40.2 3.17×2a 3.17×2a 1 1 5.0 5.0 3.5 4.4 1.7 2.1 17.7 14.5

23818 23811 23816 284.6 3.08×2a 3.08×2a 1 1 4.8 4.8 4.4 4.9 2.1 3.6 18.0 13.6

23820 23816 11278 17.3 2.25 2.25 1 2 4.0 8.0 4.9 4.2 3.6 2.1 33.5 60.1

10443 11278 11299 21.2 3 3 1 2 7.1 14.1 4.2 5.3 2.1 1.8 33.1 60.0

24909 11299 24672 124.4 3 3 1 2 7.1 14.1 5.3 5.6 1.8 2.1 33.0 60.0

24910 24672 11413 51.7 3 3 1 2 7.1 14.1 5.6 5.7 2.1 2.5 31.1 59.0

10445 11413 11480 89.6 3 3 1 2 7.1 14.1 5.7 5.0 2.5 2.2 31.4 59.0

10446 11480 11578 133.8 3 3 1 2 7.1 14.1 5.0 5.7 2.2 3.7 32.1 60.3

10447 11578 11595 28.7 3 3 1 2 7.1 14.1 5.7 6.3 3.7 4.0 47.4 95.3

25140 11595 24901 140.5 3 3 1 2 7.1 14.1 6.3 5.9 4.0 2.7 52.6 107.1

5th St. N. from N. Pollard St. to N. Oakland St. (Figure 17; profile continues on Figure 18)

25141 24901 11554 275.8 3 3 1 2 7.1 14.1 5.9 4.8 2.7 2.5 52.6 107.2

17426 11554 11549 30.9 3 3 1 2 7.1 14.1 4.8 5.2 2.5 2.1 66.1 133.3

17427 11549 11519 188.8 3 3 1 1 DB20 4 7.1 19.6 5.2 6.1 2.1 2.8 66.1 133.2

10460 11519 11457 241.1 3 3 1 1 DB21 4 7.1 19.6 6.1 4.8 2.8 4.7 66.1 136.8

10461 11457 11464 9.0 3 3 1 1 DB22 4×6 7.1 31.1 4.8 4.8 4.7 4.4 47.4 153.3

10462 11464 11471 43.6 3 3 1 1 DB23 5 7.1 26.7 4.8 5.6 4.4 6.5 66.8 208.9

17431 11471 11479 13.5 2 2 1 1 DB24 6.5 3.1 36.3 5.6 2.9 6.5 11.5 42.3 178.4

N. Oakland St. from 5th Rd N. to 2nd St. N. (West Branch) (Figure 18; profile connects to Figure 19)

10463 11471 11706 345.2 2.25 2.25 1 1 4.0 4.0 5.6 10.0 6.5 8.5 24.5 37.1

10464 11706 11881 291.8 2.5 2.5 1 1 4.9 4.9 10.0 7.5 8.5 7.4 43.5 36.2

10465 11881 11915 52.5 2.5 2.5 1 1 4.9 4.9 7.5 7.6 7.4 6.7 37.5 36.2

17510 11915 11951 39.8 2.5 2.5 1 1 4.9 4.9 7.6 7.7 6.7 6.4 37.5 36.2

17508 11951 11969 25.1 2.5 2.5 1 1 4.9 4.9 7.7 7.7 6.4 6.2 37.5 36.3

10598 11969 11979 19.1 2.5 2.5 1 1 4.9 4.9 7.7 7.4 6.2 6.0 37.5 36.4

10599 11979 11984 33.5 2.5 2.5 1 1 4.9 4.9 7.4 7.2 6.0 2.8 69.4 69.5

17516 11984 12089 142.3 4.5 4.5 1 2 15.9 31.8 7.2 6.7 2.8 3.4 165.2 290.1

17493 12089 12132 52.8 4.5 4.5 1 2 15.9 31.8 6.7 7.3 3.4 3.2 165.1 319.0


56

TABLE 3 (CONTINUED) 10-yr, 24-hr SCS Type II Storm Event: Final Iteration Results Summary

Conduit ID

Node ID Length

(ft)




10600 12132 12269 213.8 4.5 4.5 1 2 15.9 31.8 7.3 7.6 3.2 4.2 165.1 318.7

17517 12269 12468 249.9 4.5 4.5 1 2 15.9 31.8 7.6 7.8 4.2 5.7 180.0 357.0

17506 12468 12547 134.6 4.5 4.5 1 2 15.9 31.8 7.8 7.5 5.7 6.3 180.0 357.0

17507 12547 12590 98.3 4.5 4.5 1 2 15.9 31.8 7.5 6.8 6.3 4.2 192.9 368.5

10601 12590 12610 54.7 4.5 4.5 1 2 15.9 31.8 6.8 6.6 4.2 3.9 192.9 368.4

N. Oakland St. from 5th Rd. N. to N. Pershing Dr. (East Branch)

10476 11465 11479 21.6 3.5 3.5 1 1 9.6 9.6 2.6 2.9 10.7 11.5 41.9 41.9

10477 11479 11701 335.5 4.5 4.5 1 1 15.9 15.9 2.9 2.7 11.5 7.9 83.8 197.0

10478 11701 11940 378.5 4.5 4.5 1 1 15.9 15.9 2.7 3.5 7.9 3.3 99.4 222.7

10613 11940 11984 64.2 3.67×6a 3.67×6a 1 1 17.3 17.3 3.5 7.2 3.3 2.8 100.0 222.8

10503b 11706 11701 13.8 1.25 1.25 1 1 DB25 3 1.2 8.3 10.0 2.7 8.5 7.9 15.5 36.0

5th St. N. and N. Monroe St. to N. Oakland St. and N. Pershing Dr.

20873 11274 11468 301.8 4 4 1 1 12.6 12.6 5.2 4.6 5.2 4.6 86.4 86.6

20874 11468 11620 234.9 4 4 1 1 12.6 12.6 4.6 4.6 4.6 4.6 86.4 86.6

10482 11620 11650 35.5 4 4 1 1 12.6 12.6 4.6 4.9 4.6 4.9 86.4 86.6

10484 11650 11739 218.6 4 4 1 1 12.6 12.6 4.9 2.4 4.9 2.4 107.2 107.4

25144 11739 24902 268.9 4 4 1 1 12.6 12.6 2.4 3.7 2.4 3.3 107.0 107.4

25145 24902 11906 234.3 4 4 1 1 12.6 12.6 3.7 7.0 3.3 6.6 107.4 107.4

17440 11906 11920 33.6 4 4 1 1 12.6 12.6 7.0 6.6 6.6 6.2 106.2 106.4

10485 11920 11929 13.0 4 4 1 1 12.6 12.6 6.6 6.1 6.2 5.7 106.2 106.4

10609 11929 11946 19.7 4 4 1 1 12.6 12.6 6.1 5.5 5.7 5.1 106.2 106.4

10610 11946 11978 52.0 4 4 1 1 12.6 12.6 5.5 3.2 5.1 2.6 106.2 106.3

N. Oakland St. and N. Pershing Dr. (Existing Parallel System)

17441 11906 11931 34.7 1.5 1.5 1 1 1.8 1.8 7.0 4.6 6.6 4.1 13.6 13.9

17442 11906 11931 33.9 1.75 1.75 1 1 2.4 2.4 7.0 4.6 6.6 4.1 19.1 19.6

17443 11931 11949 23.2 2.5 2.5 1 1 4.9 4.9 4.6 3.5 4.1 2.9 32.7 33.5

10611 11949 11978 50.1 2.5 2.5 1 1 4.9 4.9 3.5 3.2 2.9 2.6 32.7 33.5


57


Conduit ID

Node ID Length

(ft)




N. Oakland St. and N. Pershing Dr. to S. Glebe Rd. and 1st Rd. S. (Figure 19; profile connects to Figure 20)

10603 11978 12080 140.7 4 4 1 1 12.6 12.6 3.2 5.4 2.6 3.4 138.8 139.8

10604 12080 12262 261.1 4 4 1 1 12.6 12.6 5.4 7.0 3.4 3.6 139.1 148.7

17503 12262 12462 264.2 4 4 1 1 12.6 12.6 7.0 7.0 3.6 3.6 144.8 139.0

17504 12462 12610 275.2 4 4 1 1 12.6 12.6 7.0 6.6 3.6 3.9 155.8 150.7

10602 12610 12647 84.8 5.5 5.5 1 2 23.8 47.5 6.6 6.1 3.9 3.2 351.1 519.0

10663 12647 12756 253.0 5.5 5.5 1 2 23.8 47.5 6.1 8.0 3.2 4.3 384.0 559.2

10660 12756 12846 131.4 6 6 1 2 28.3 56.5 8.0 8.1 4.3 4.9 384.0 559.2

17614 12846 12940 112.9 6 6 1 2 28.3 56.5 8.1 11.2 4.9 3.8 384.0 559.2

17571 12940 12964 24.9 7 7 1 2 38.5 77.0 11.2 10.6 3.8 3.4 413.8 585.0

17617 12964 13154 257.9 7 7 1 2 38.5 77.0 10.6 14.2 3.4 6.0 515.6 677.5

22216 13154 13227 81.0 7 7 1 2 38.5 77.0 14.2 14.6 6.0 6.1 591.7 738.8

10670 13227 13497 292.4 7 7 1 2 38.5 77.0 14.6 11.3 6.1 7.7 591.7 739.0

25155b 12080 12089 19.9 2.25 2.25 1 1 4.0 4.0 5.4 6.7 3.4 3.4 17.9 25.1

17501b 12262 12269 13.5 2 2 1 1 DB26 2 3.1 6.3 7.0 7.6 3.6 4.2 19.8 14.0

S. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. (Figure 20; profile continues on Figure 23)

17669 13785 13621 173.9 3 3 1 1 7.1 7.1 4.8 6.0 0.9 3.1 21.5 6.1

17671 13621 13497 178.7 3 3 1 1 7.1 7.1 6.0 11.3 3.1 7.7 32.4 5.8

17670 13497 13608 134.7 7 7 1 2 38.5 77.0 11.3 9.7 7.7 6.5 470.3 778.2

17672 13608 13742 124.1 7 7 1 2 38.5 77.0 9.7 8.6 6.5 6.4 470.3 778.1

10797 13742 13873 115.8 7 7 1 2 38.5 77.0 8.6 7.5 6.4 6.0 470.3 778.1

10730 13873 13909 56.3 7 7 1 2 38.5 77.0 7.5 5.0 6.0 4.0 470.6 778.1

10731 13909 14053 183.7 7 7 1 2 38.5 77.0 5.0 7.6 4.0 4.8 471.3 778.0

10732 14053 14247 273.1 7 7 1 2 38.5 77.0 7.6 11.5 4.8 10.4 471.2 781.8

10733 14247 14357 151.3 8 8 1 2 50.3 100.5 11.5 11.0 10.4 10.1 485.3 811.6

10734 14357 14377 24.5 8 8 1 2 50.3 100.5 11.0 10.3 10.1 10.1 485.3 811.8

N. Thomas St. North of Arlington Blvd. (Figure 21)

10637 13022 13035 15.6 3 3 1 1 7.1 7.1 5.0 4.4 4.6 3.8 68.8 73.9

20886 13035 13094 101.7 3 3 1 1 7.1 7.1 4.4 4.2 3.8 3.2 68.8 73.8


58


Conduit ID

Node ID Length

(ft)




10638 13094 13169 102.6 3 3 1 1 7.1 7.1 4.2 4.4 3.2 3.2 68.8 73.8

10639 13169 13240 122.1 3 3 1 1 7.1 7.1 4.4 4.2 3.2 2.6 68.8 73.8

10640 13240 13317 132.1 3.5 3.5 1 1 9.6 9.6 4.2 5.0 2.6 3.3 68.8 73.8

10641 13317 13323 13.3 3 3 1 1 7.1 7.1 5.0 6.7 3.3 3.4 66.0 73.8

10642 13323 13487 164.5 3 3 1 2 7.1 14.1 6.7 13.5 3.4 10.0 61.6 107.5

25443 13487 25169 62.4 3 3 1 2 7.1 14.1 13.5 14.7 10.0 8.5 61.6 107.5

25444 25169 13569 86.1 3 3 1 2 7.1 14.1 14.7 16.4 8.5 9.2 61.6 107.5

17654 13569 13616 41.5 3 3 1 2 7.1 14.1 16.4 14.7 9.2 8.4 83.6 167.9

North of National Foreign Affairs Training Center

17582 13394 13540 142.5 3 3 1 1 7.1 7.1 14.1 15.7 6.9 8.4 42.4 54.4

10727 13540 13569 30.4 3 3 1 1 7.1 7.1 15.7 16.4 8.4 9.2 42.4 54.4

South of National Foreign Affairs Training Center

11662 14607 14644 71.2 4 4 1 1 12.6 12.6 1.4 5.1 3.5 12.3 83.3 167.9

11665 14644 14677 51.5 4 4 1 1 12.6 12.6 5.1 5.3 12.3 10.0 83.3 167.9

6th St. S. from S. Irving St. to S. Glebe Rd.

25116 24883 24884 203.5 2×3.17 2×3.17 1 1 6.3 6.3 3.6 4.6 1.5 1.5 25.9 27.5

25117 24884 24885 332.1 2×3.17 2×3.17 1 1 6.3 6.3 4.6 4.6 1.5 2.2 25.9 27.1

25118 24885 24886 261.2 2.25×3.5 2.25×3.5 1 1 7.9 7.9 4.6 4.7 2.2 2.2 41.7 50.8

25119 24886 24887 81.2 2.25×3.5 2.25×3.5 1 1 7.9 7.9 4.7 4.8 2.2 2.0 37.9 50.7

25120 24887 24888 110.2 2.42×3.75 2.42×3.75 1 1 9.1 9.1 4.8 6.4 2.0 2.6 39.7 50.7

5th Rd. S. from S. Jackson St. to S. Glebe Rd.

24956 24759 24758 32.3 3 3 1 1 7.1 7.1 2.4 2.6 1.9 1.6 35.1 35.3

24955 24758 24757 127.0 3 3 1 1 7.1 7.1 2.6 4.2 1.6 3.0 34.5 35.3

24952 24757 24755 27.0 3 3 1 1 7.1 7.1 4.2 3.9 3.0 2.6 34.5 35.1

24953 24755 24756 193.4 3 3 1 1 7.1 7.1 3.9 6.6 2.6 1.6 34.5 34.8

24954 24756 14308 229.3 3 3 1 1 7.1 7.1 6.6 6.7 1.6 3.8 34.5 36.4

10787 14308 14313 21.6 3.5 3.5 1 1 9.6 9.6 6.7 6.8 3.8 3.9 34.5 36.0

10786 14313 14320 108.4 3.5 3.5 1 1 9.6 9.6 6.8 7.7 3.9 5.3 34.5 36.2


59


Conduit ID

Node ID Length

(ft)




S. Glebe Rd. and 6th St. S. to S. Oakland St. and 3rd St. S. (Figure 22; profile continues on Figure 23)

25126 14587 24888 42.7 3.5 3.5 1 2 9.6 19.2 7.0 6.4 2.7 2.6 53.9 53.8

25127 24888 14540 41.5 3.5 3.5 1 2 9.6 19.2 6.4 6.7 2.6 2.5 65.1 114.9

11695 14540 14463 137.3 3.5 3.5 1 2 9.6 19.2 6.7 6.4 2.5 2.0 62.7 115.3

10780 14463 14320 255.4 3 3 1 1 DB27 4.5 7.1 23.0 6.4 7.7 2.0 5.3 61.9 120.3

24949 14320 24753 26.2 3.5 3.5 1 1 DB28 4.5 9.6 25.5 7.7 7.9 5.3 5.5 94.8 189.0

24950 24753 14202 229.0 3.5 3.5 1 1 DB29 4.5 9.6 25.5 7.9 9.5 5.5 7.3 94.8 180.0

10736 14202 14243 189.7 4.5 4.5 1 2 15.9 31.8 9.5 7.9 7.3 6.1 131.4 249.6

10791 14243 14267 107.2 4.5 4.5 1 2 15.9 31.8 7.9 7.3 6.1 5.4 131.4 249.6

10792 14267 14279 62.2 4.5 4.5 1 2 15.9 31.8 7.3 6.9 5.4 5.4 159.8 275.0

10737 14279 14318 165.4 4.5 4.5 1 2 15.9 31.8 6.9 4.8 5.4 4.1 159.8 275.0

10738 14318 14341 66.3 4.5 4.5 1 2 15.9 31.8 4.8 5.6 4.1 5.3 159.8 272.8

10739 14341 14364 35.9 4.5 4.5 1 2 15.9 31.8 5.6 7.1 5.3 7.2 159.8 271.9

17668 14364 14377 41.9 6 6 1 1 28.3 28.3 7.1 10.3 7.2 10.1 152.2 284.6

West of Arlington Blvd. and S. Hudson St. to 2nd St. S. and S. Old Glebe Rd.

17590 13026 13073 74.4 4 4 1 1 12.6 12.6 3.1 2.5 3.1 2.5 68.9 68.9

17591 13073 13287 268.7 4 4 1 1 12.6 12.6 2.5 3.3 2.5 3.2 68.5 68.5

17592 13287 13388 117.3 4.5 4.5 1 1 15.9 15.9 3.3 3.7 3.2 3.5 65.7 67.2

17593 13388 13472 70.3 4.5 4.5 1 1 15.9 15.9 3.7 3.8 3.5 3.5 63.8 65.8

17594 13472 13508 52.4 4.5 4.5 1 1 15.9 15.9 3.8 3.7 3.5 3.4 63.9 64.7

17662 13508 13600 129.6 4.5 4.5 1 1 15.9 15.9 3.7 4.5 3.4 4.1 65.1 64.4

25179 13600 24948 217.7 4.5 4.5 1 1 15.9 15.9 4.5 5.6 4.1 5.4 92.9 92.7

25180 24948 13750 155.3 4.5 4.5 1 1 15.9 15.9 5.6 6.5 5.4 6.3 92.9 92.8

10755 13750 13808 54.7 4.5 4.5 1 1 15.9 15.9 6.5 5.9 6.3 5.8 147.6 147.3

West of 2nd St. S. and S. Jackson St. to National Foreign Affairs Training Center Parking Lot

10766 13642 13789 368.4 3 3 1 1 7.1 7.1 2.2 6.5 1.9 3.8 33.6 34.8

10767 13789 13808 54.0 3 3 1 1 7.1 7.1 6.5 5.9 3.8 5.8 33.6 34.9

10756 13808 13911 108.7 4.5 4.5 1 1 15.9 15.9 5.9 3.8 5.8 3.1 165.5 155.1

10757 13911 14063 185.1 4.5 4.5 1 1 15.9 15.9 3.8 11.4 3.1 9.5 165.4 154.9


60


Conduit ID

Node ID Length

(ft)




24945 14063 14152 115.6 4.5 4.5 1 1 15.9 15.9 11.4 13.0 9.5 11.1 165.4 154.9

10760 14152 14212 103.0 5 5 1 1 19.6 19.6 13.0 12.3 11.1 10.7 165.4 154.9

10761 14212 14338 534.6 5 5 1 1 19.6 19.6 12.3 8.7 10.7 8.4 165.4 154.9

10762 14338 14362 41.2 5 5 1 1 19.6 19.6 8.7 8.1 8.4 8.0 165.4 154.9

10763 14362 14364 50.3 5 5 1 1 19.6 19.6 8.1 7.1 8.0 7.2 165.4 154.9

10764 14364 14397 47.0 4.5 4.5 1 1 15.9 15.9 7.1 3.8 7.2 3.9 170.6 177.0

21180 14397 14490 94.1 5 5 1 1 19.6 19.6 3.8 3.2 3.9 3.3 170.7 176.9

21177 14490 14668 316.4 5 5 1 1 19.6 19.6 3.2 2.2 3.3 3.3 182.9 187.3

S. Old Glebe Rd. from 2nd St. S. to S. Glebe Rd.

10770 13818 13808 27.9 3 3 1 1 7.1 7.1 4.0 5.9 4.3 5.8 20.3 34.1

10775 13818 13922 108.6 3 3 1 1 7.1 7.1 4.0 4.6 4.3 5.6 28.0 45.4

25035 13922 24787 77.0 3 3 1 1 7.1 7.1 4.6 7.1 5.6 6.8 28.0 41.9

25030 24787 14128 165.0 3 3 1 1 7.1 7.1 7.1 7.9 6.8 6.8 28.0 40.3

10778 14128 14138 27.0 3 3 1 1 7.1 7.1 7.9 7.9 6.8 5.8 28.0 40.3

10779 14138 14202 89.7 3 3 1 1 7.1 7.1 7.9 9.5 5.8 7.3 28.0 40.3

S. Oakland St. and 3rd St S. to South of National Foreign Affairs Training Center (Figure 23; profile continues on Figure 27)

11663 14377 14499 125.4 8 8 1 2 50.3 100.5 10.3 7.2 10.1 8.7 619.7 1040.5

11661 14499 14542 81.5 8 8 1 2 50.3 100.5 7.2 5.8 8.7 9.0 619.6 1040.5

11664 14542 14677 247.7 8 8 1 2 50.3 100.5 5.8 5.3 9.0 10.0 619.7 1040.2

17728 14677 14904 451.9 8 8 1 1 50.3 50.3 5.3 7.3 10.0 10.7 689.3 929.7

21172 14904 15016 154.8 8 8 1 1 50.3 50.3 7.3 4.4 10.7 5.5 689.3 929.7

21168 15016 15031 13.9 Stream Stream 1 1 882.1 1393.1

21169 15031 15479 663.5 Stream Stream 1 1 962.2 1468.6

National Foreign Affairs Training Center Parking Lot to S. Quincy St. and 6th St S. (North Branch)

21179 14668 14688 37.3 5.5 5.5 1 1 23.8 23.8 2.2 1.9 3.3 4.1 95.3 99.8

21875 14688 14825 270.5 5.5 5.5 1 1 23.8 23.8 1.9 2.7 4.1 6.9 98.0 254.7

17730 14825 14916 158.2 5.5 5.5 1 1 23.8 23.8 2.7 3.1 6.9 6.3 100.6 257.4

17732b 14677 14688 15.4 4 4 1 2 12.6 25.1 5.3 1.9 10.0 4.1 10.8 276.4


61


Conduit ID

Node ID Length

(ft)




National Foreign Affairs Training Center Parking Lot to S. Quincy St. and 6th St S. (South Branch)

21178 14668 14688 35.0 5 5 1 1 19.6 19.6 2.2 1.9 3.3 4.1 87.7 87.5

21874 14688 14825 269.1 5 5 1 1 19.6 19.6 1.9 2.7 4.1 6.9 95.7 208.5

17731 14825 14916 158.4 5 5 1 1 19.6 19.6 2.7 3.1 6.9 6.3 93.0 205.9

17717 14916 14991 112.9 6.9×6.7 6.9×6.7 1 1 46.2 46.2 3.1 2.9 6.3 5.5 193.6 463.3

21898 14991 15016 39.6 6.9×6.7 6.9×6.7 1 1 46.2 46.2 2.9 4.4 5.5 5.5 193.6 463.3

S. George Mason Dr. from Arlington Blvd. to 6th St S. (Figure 24; profile connects to Figure 26)

6896 13687 13788 85.0 3 3 1 1 7.1 7.1 0.9 0.8 0.9 0.8 12.3 12.3

6897 13788 13940 150.2 3 3 1 1 7.1 7.1 0.8 1.1 0.8 1.1 12.3 12.3

6898 13940 14099 241.0 3 3 1 1 7.1 7.1 1.1 3.2 1.1 3.2 25.6 25.6

25189 14099 24934 34.3 4 4 1 1 12.6 12.6 3.2 2.1 3.2 2.1 129.1 129.1

25190 24934 24935 129.2 4.5 4.5 1 1 15.9 15.9 2.1 2.1 2.1 2.1 129.2 129.2

25191 24935 24936 165.8 4.5 4.5 1 1 15.9 15.9 2.1 3.0 2.1 3.0 129.2 129.2

25195 24936 14717 510.9 4.5 4.5 1 1 15.9 15.9 3.0 4.6 3.0 3.2 129.0 127.7

25197 14717 24941 132.6 4.5 4.5 1 1 15.9 15.9 4.6 6.6 3.2 4.6 144.3 146.8

25200 24941 24942 63.7 4.5 4.5 1 1 15.9 15.9 6.6 7.0 4.6 5.1 144.3 146.6

25201 24942 24944 54.8 4.5 4.5 1 1 15.9 15.9 7.0 6.9 5.1 4.6 144.3 146.6

25202 24944 24945 83.1 4.5 4.5 1 1 15.9 15.9 6.9 6.4 4.6 3.6 144.3 146.8

25214 24945 14939 147.5 4.5 4.5 1 1 15.9 15.9 6.4 6.1 3.6 2.2 197.6 198.4

11635 14939 15127 221.5 3.5 3.5 1 2 9.6 19.2 6.1 7.2 2.2 2.2 146.0 198.7

11636 15127 15236 153.4 3.5 3.5 1 2 9.6 19.2 7.2 6.8 2.2 2.6 146.0 198.9

S. George Mason Dr. from 4th St. S. to 6th St. S. (Figure 25; profile connects to Figure 26)

21166 15056 15066 13.3 1.75 1.75 1 1 2.4 2.4 6.4 2.7 6.0 2.4 25.9 26.2

11642 15066 15149 173.5 1.75 1.75 1 1 2.4 2.4 2.7 5.7 2.4 0.9 25.1 24.9

11643 15149 15276 244.3 1.75 1.75 1 2 2.4 4.8 5.7 1.7 0.9 0.6 24.2 24.7

11743 15276 15308 72.4 1.75 1.75 1 2 2.4 4.8 1.7 6.9 0.6 2.9 24.3 24.7

S. George Mason Dr. and 4th St. S. to South of National Foreign Affairs Training Center (Figure 26; profile continues on Figure 27)

11639 15056 15058 53.8 2.25 2.25 1 1 4.0 4.0 6.4 5.3 6.0 4.9 33.2 33.3

11640 15058 15229 317.9 2.25 2.25 1 1 4.0 4.0 5.3 3.8 4.9 3.2 46.5 47.0


62


Conduit ID

Node ID Length

(ft)




11641 15229 15236 16.2 2.25 2.25 1 1 4.0 0.0 3.8 6.8 3.2 2.6 46.5 47.0

11637 15236 15272 58.0 4 4 1 2 12.6 25.1 6.8 7.4 2.6 2.8 188.8 245.9

11742 15272 15308 70.2 4 4 1 2 12.6 25.1 7.4 6.9 2.8 2.9 188.8 246.0

11744 15308 15348 148.0 4.5 4.5 1 2 15.9 31.8 6.9 1.7 2.9 1.9 242.7 301.0

21173 15348 15479 438.5 Stream Stream 1 1 242.3 300.5

South of National Foreign Affairs Training Center to S. George Mason Dr. and 12th Rd. S. (Figure 27; profile continues on Figure 34)

11745 15479 15750 364.9 Stream Stream 1 1 1385.2 1916.1

17773 15750 15861 143.7 Stream Stream 1 1 1385.8 1914.8

17772a 15861 15921 69.1 6 Stream 1 1 28.3 9.4 5.3 8.8 9.7 457.5 1908.2

17774 15921 16050 179.5 Stream Stream 1 1 1011.1 2012.3

17769 16050 16159 162.2 Stream Stream 1 1 1050.4 1965.4

25283 16159 16475 457.0 Stream Stream 1 1 1093.8 1837.7

17816 16475 16723 324.2 6×6 6×6 2 2 DB31 7 72.0 110.5 11.6 9.3 16.6 12.3 1053.0 1844.2

17814 16723 16730 11.4 6×6 6×6 2 2 DB32 7 72.0 110.5 9.3 8.4 12.3 11.1 1082.5 1856.6

17815 16730 16818 67.2 6×6 6×6 2 2 DB33 7 72.0 110.5 8.4 7.4 11.1 9.6 1102.5 1864.4

17914 16818 16980 216.4 6×7 6×7 2 2 DB34 7 84.0 122.5 7.4 5.4 9.6 7.6 1102.7 1867.1

17909 16980 17097 121.4 6×7 6×7 2 2 DB35 7 84.0 122.5 5.4 4.1 7.6 5.8 1101.3 1880.7

17910 17097 17159 104.2 6×7 6×7 2 2 DB36 7 84.0 122.5 4.1 5.6 5.8 8.9 1102.9 1883.8

17911 17159 17190 49.6 6×7 6×7 2 2 DB37 7 84.0 122.5 5.6 8.1 8.9 11.1 1165.5 1937.4

8th St. S. from S. George Mason Dr. to Four Mile Run (Figure 28)

11716 15965 15922 160.2 3 3 1 1 7.1 7.1 7.4 7.5 2.5 5.8 105.3 105.1

11717 15922 15928 24.0 3 3 1 2 7.1 14.1 7.5 3.1 5.8 7.4 103.1 105.1

17775 15928 15921 17.5 Stream Stream 1 1 120.0 119.6

9th St. S. and S. Monroe St. to West of S. Oakland St. and Columbia Pike (Figure 29; profile continues on Figure 30)

11778 15787 15803 25.9 3 3 1 1 7.1 7.1 5.9 6.6 2.5 2.6 37.9 43.4

11772 15803 15860 53.3 3 3 1 2 7.1 14.1 6.6 6.1 2.6 2.2 58.1 89.7

11773 15860 15963 129.4 3 3 1 2 7.1 14.1 6.1 8.3 2.2 2.2 58.1 89.5

11873 15963 15999 105.1 3 3 1 2 7.1 14.1 8.3 6.7 2.2 2.1 58.1 89.5

11872 15999 16057 109.7 3 3 1 2 7.1 14.1 6.7 5.9 2.1 2.7 58.1 89.6


63


Conduit ID

Node ID Length

(ft)




17854 16057 16108 93.7 3 3 1 2 7.1 14.1 5.9 7.4 2.7 3.6 58.1 89.4

23682 16108 23714 32.9 3 3 1 2 7.1 14.1 7.4 7.0 3.6 2.9 58.1 89.4

23683 23714 16110 46.6 3 3 1 2 7.1 14.1 7.0 6.2 2.9 1.9 67.1 114.0

17847 16110 16130 110.4 3 3 1 2 7.1 14.1 6.2 12.3 1.9 7.8 69.5 115.4

17848 16130 16150 32.8 3 3 1 2 7.1 14.1 12.3 11.8 7.8 7.6 69.6 115.4

21240 16150 16153 6.8 3 3 1 2 7.1 14.1 11.8 12.3 7.6 8.0 69.6 115.5

21241 16153 16169 26.1 3.5 3.5 1 2 9.6 19.2 12.3 12.8 8.0 8.5 69.7 115.5

17866 16169 16264 193.6 3.5 3.5 1 2 9.6 19.2 12.8 12.4 8.5 9.3 92.5 150.7

17868 16264 16378 138.2 3.5 3.5 1 2 9.6 19.2 12.4 10.7 9.3 9.9 113.8 171.2

Columbia Pike to S. Quincy St. (Figure 30; profile continues on Figure 31)

17859 16387 16430 53.8 4×4 4×4 1 1 16.0 16.0 10.0 9.3 6.4 5.0 127.1 218.9

17869 16378 16387 10.1 4×4 4×4 1 1 16.0 16.0 10.7 10.0 9.9 6.4 95.0 171.3

17860 16430 16441 18.4 4×4 4×4 1 1 16.0 16.0 9.3 9.0 5.0 3.0 127.1 218.9

17855 16441 16493 163.6 3.5 3.5 1 2 9.6 19.2 9.0 13.2 3.0 3.1 134.3 254.0

17856 16493 16535 92.8 3.5 3.5 1 2 9.6 19.2 13.2 11.0 3.1 4.3 134.4 252.7

17857 16535 16698 222.6 3.5 3.5 1 2 9.6 19.2 11.0 18.5 4.3 11.3 134.3 248.9

21242 16698 16855 227.3 4 4 1 2 12.6 25.1 18.5 12.0 11.3 8.6 134.4 248.9

S. Quincy St. to S. George Mason Rd. and 12th Rd. S. (Figure 31; profile continues on Figure 34)

11852 16855 16861 11.9 4 4 1 2 12.6 25.1 12.0 11.8 8.6 8.8 134.4 249.0

11853 16861 16866 14.3 4 4 1 2 12.6 25.1 11.8 11.8 8.8 7.9 114.9 249.0

11854 16866 16869 15.8 4 4 1 2 12.6 25.1 11.8 11.2 7.9 6.8 139.3 302.4

17940 16869 16964 190.2 4 4 1 1 DB38 5 12.6 32.2 11.2 10.0 6.8 7.9 166.6 342.2

17937 16964 17022 70.5 4 4 1 1 DB39 5 12.6 32.2 10.0 9.6 7.9 6.9 148.4 342.2

21252 17022 17074 56.5 4 4 1 1 DB40 5 12.6 32.2 9.6 9.5 6.9 7.1 148.4 342.2

21253 17074 17099 42.0 4 4 1 1 DB41 5 12.6 32.2 9.5 9.6 7.1 7.0 148.4 344.3

17934 17099 17085 134.1 5 5 1 1 DB47 6 19.6 47.9 9.6 9.3 7.0 8.6 276.9 549.6

17935 17085 17096 23.0 5.5 5.5 1 1 DB48 6 23.8 52.0 9.3 7.8 8.6 7.8 288.9 561.9

17936 17096 17178 120.4 5.5 5.5 1 1 DB49 7 23.8 62.2 7.8 7.3 7.8 8.8 288.9 562.4

17941 17178 17190 83.1 5.5 5.5 1 1 DB50 7 23.8 62.2 7.3 8.1 8.8 11.1 288.2 563.4


64


Conduit ID

Node ID Length

(ft)




S. Pollard St. and 14th St. S. to S. Quincy St. and 13th St. S. (West Branch) (Figure 32; profile continues on Figure 33)

17923 17535 17436 162.4 2.25 2.25 1 1 4.0 4.0 7.5 4.3 1.8 3.0 39.7 39.3

17938 17436 17405 42.2 2 2 1 1 3.1 3.1 4.3 4.6 3.0 1.4 29.6 32.9

11950 17405 17429 81.0 2 2 1 2 3.1 6.3 4.6 5.2 1.4 1.2 35.5 44.0

11951 17429 17336 178.6 2 2 1 2 3.1 6.3 5.2 7.0 1.2 1.2 33.4 44.0

11952 17336 17259 113.5 2 2 1 2 3.1 6.3 7.0 4.4 1.2 2.4 33.3 43.7

25235 17259 17272 50.2 2 2 1 1 3.1 3.1 4.4 4.7 2.4 1.9 19.2 17.3

11953 17272 17249 38.6 2 2 1 1 3.1 3.1 4.7 6.8 1.9 2.9 19.2 17.2

S. Pollard St. and 14th St. S. to S. Quincy St. and 13th St. S. (East Branch)

11930 17535 17436 160.0 2.25 2.25 1 1 4.0 4.0 7.5 4.3 1.8 3.0 39.9 40.0

17918 17436 17412 29.5 2.25 2.25 1 1 4.0 4.0 4.3 4.6 3.0 2.9 41.8 46.4

17919 17412 17404 9.9 2.25 2.25 1 1 4.0 4.0 4.6 4.1 2.9 1.9 47.0 52.1

11931 17404 17250 223.2 2.25 2.25 1 1 4.0 4.0 4.1 5.7 1.9 3.7 41.4 40.7

11932 17250 17235 20.7 2.25 2.25 1 1 4.0 4.0 5.7 4.6 3.7 2.2 41.5 40.7

11933 17235 17223 42.0 2.25 2.25 1 1 4.0 4.0 4.6 5.2 2.2 3.2 41.5 40.7

11934 17223 17210 49.0 2.5 2.5 1 1 4.9 4.9 5.2 5.5 3.2 3.9 41.5 40.8

11935 17210 17219 51.2 2.5 2.5 1 1 4.9 4.9 5.5 5.1 3.9 4.0 41.5 40.8

11936 17219 17237 71.8 3 3 1 1 7.1 7.1 5.1 5.9 4.0 3.3 61.1 72.8

11937 17237 17249 37.9 3 3 1 1 7.1 7.1 5.9 6.8 3.3 2.9 82.7 108.0

17939 17404 17405 8.4 2 2 1 1 3.1 3.1 4.1 4.6 1.9 1.4 5.9 11.2

17924 17259 17237 42.1 2 2 1 1 3.1 3.1 4.4 5.9 2.4 3.3 23.9 36.1

S. Quincy St. and 13th St. S. to S. Quebec St. Cul-de-sac (Figure 33; profile connects to Figure 31)

11938 17249 17230 51.8 3 3 1 1 DB42 2 7.1 10.2 6.8 6.2 2.9 2.3 96.2 124.1

11939 17230 17184 110.2 3 3 1 1 DB43 2 7.1 10.2 6.2 10.6 2.3 7.5 96.2 126.1

11940 17184 17109 148.9 3 3 1 1 DB44 2 7.1 10.2 10.6 5.8 7.5 2.9 126.3 157.4

17932 17109 17054 214.7 4 4 1 1 DB45 2 12.6 15.7 5.8 7.8 2.9 2.9 172.8 202.5

17933 17054 17099 158.8 4 4 1 1 DB46 3.5 12.6 22.2 7.8 9.6 2.9 7.0 155.8 210.7


65


Conduit ID

Node ID Length

(ft)




S. George Mason Dr. from 12th Rd. S. to south of 13th Rd. S. (Figure 34; profile continues on Figure 35)

17915 17190 17198 9.7 6×10 6×10 2 3 120.0 180.0 8.1 6.8 11.1 9.6 1432.6 2327.4

17944 17198 17390 271.0 6×10 6×10 2 3 120.0 180.0 6.8 7.8 9.6 10.1 1433.4 2327.2

17928 17390 17403 17.5 6×10 6×10 2 3 120.0 180.0 7.8 7.6 10.1 9.8 1433.8 2327.5

17929 17403 17509 151.4 6×10 6×10 2 3 120.0 180.0 7.6 7.3 9.8 9.2 1455.5 2347.2

25129 17509 17562 57.7 6×10 6×10 2 3 120.0 180.0 7.3 7.0 9.2 8.7 1455.7 2347.4

17942 17562 17717 186.5 6×10 6×10 2 3 120.0 180.0 7.0 7.4 8.7 8.9 1507.9 2390.5

13551 17717 17761 55.2 6×10 6×10 2 3 120.0 180.0 7.4 7.0 8.9 8.3 1507.9 2390.5

21418 17761 18036 331.4 6×10 6×10 2 3 120.0 180.0 7.0 7.8 8.3 8.7 1508.3 2390.4

13511 18036 18080 55.5 6×10 6×10 2 3 120.0 180.0 7.8 7.2 8.7 8.1 1549.5 2423.0

13512 18080 18120 48.8 6×10 6×10 2 3 120.0 180.0 7.2 4.3 8.1 5.3 1570.7 2440.7

13524 18120 18246 224.4 Stream Stream 1 1 1576.5 2445.2

13526 18246 18327 92.8 Stream Stream 1 1 1600.7 2453.4

13528 18327 18351 21.3 Stream Stream 1 1 1604.8 2453.1

13530 18351 18411 44.8 Stream Stream 1 1 1607.0 2453.4

13532 18411 18502 106.8 Stream Stream 1 1 1627.5 2464.2

South of S. George Mason Dr. and 13th Rd. S. to Four Mile Run Outfall (Figure 35)

13664 18502 18581 112.5 Stream Stream 1 1 1631.7 2464.6

13643a 18581 18628 65.4 6 Stream 1 1 28.3 10.3 4.5 9.7 6.6 448.6 2470.8

13674 18628 18641 12.9 Stream Stream 1 1 1368.6 2470.8

13675 18641 18679 57.8 Stream Stream 1 1 1407.2 2493.6

13660 18679 18758 110.9 Stream Stream 1 1 1409.3 2493.5

13661 18758 18792 30.3 Stream Stream 1 1 1406.8 2491.8

21412 18792 18925 160.4 Stream Stream 1 1 1405.4 2490.7

25289 18925 25018 62.5 8×10 8×10 2 3 160.0 240.0 8.5 8.4 10.7 10.2 1407.0 2491.2

25290 25018 18977 24.2 8×10 8×10 2 3 160.0 240.0 8.4 8.3 10.2 10.0 1428.5 2501.8

21415 18977 18990 22.9 8×10 8×10 2 3 160.0 240.0 8.3 8.2 10.0 9.7 1453.4 2515.5

21416 18990 19005 54.0 8×10 8×10 2 3 160.0 240.0 8.2 7.6 9.7 9.0 1493.1 2537.1

18419 19005 19024 27.3 8×10 8×10 2 3 160.0 240.0 7.6 7.4 9.0 8.7 1493.1 2537.6


66


Conduit ID

Node ID Length

(ft)




18420 19024 19043 30.2 8×10 8×10 2 3 160.0 240.0 7.4 7.1 8.7 8.4 1493.2 2537.1

13642 19043 19064 18.9 8×10 8×10 2 3 160.0 240.0 7.1 5.4 8.4 6.9 1493.3 2537.1

21431 19064 19532 718.2 Stream Stream 1 1 1532.5 2561.5

US, upstream; DS, downstream. Note that cross-sectional area and HGL are not calculated for natural stream sections. The existing and final HGL data represent maximum node depths. a Irregularly shaped pipe, such as arch, elliptical. b Equalizer pipe not shown on profile.

H:\ARLINGTONVACOUNTYOF\392309STORMWATERCAP\WSDOCTORSBRANCH\WORKINGGIS\LAYOUT\DESIGN_ITERATIONS\FIGURE15_RECOMMENDED_ADDITIONAL_CAPACITY_10YR24HR.MXD FCAIN 12/18/2012 3:20:50 PM

VICINITY MAP

N Fillmore St


N George Mason

Dr

N Carlin Springs

Rd

S Cou rt House Rd

S Columbus St

7th Rd S

7th St S

S Four Mile Run Dr

Washington Blvd

2nd St S

S Quincy St

S Geor

ge Maso

n Dr

S Pe

rshing

Dr

S Walt

er Re

ed

Dr

Columbia Pike

N Glebe Rd

S Glebe Rd

Arlington Blvd

Arlington Blvd

LegendModeled Stormwater Mains withRecommended Additional CapacityModeled Stormwater Mainswith Sufficient Existing CapacityStreamsRoadsModeled (Revised) Watershed Boundary

0 1,200600

Feet

FIGURE 15Recommended Additional Capacityfor the 10-yr, 24-hr StormDoctor's Branch WatershedArlington County Storm Capacity Analysis


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F16_23813


Existing Grade

N. Quincy St. and 5th Rd. N. to 5th St. N. and N. Pollard Rd. for the 10yr-24hr Storm Event

23813 10445 10446 25140104472491024909104432382023818

23810 11413 249011159511578114802467211299112782381623811

2’x3.17’(1)

2’x3.08’(1)

2.25’(2)3’(2)

3’(2)

3’(2)

3’(2)3’(2)

3’(2)

3’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F17_25141


Existing Grade


Additional Pipe

4’(1)

5th St. N. from N. Pollard St. to N. Oakland St. for the 10yr-24hr Storm Event

25141 10461 1743110462104601742717426

24901 11519 114791147111464114571154911554

3’(1)

4’(1)3’(1)

5’(1)3’(1)

6.5’(1)2’(1)

4x6’(1)3’(1)

3’(2)3’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F18_10463


Existing Grade

N. Oakland St. and 5th St. N. to 2nd St. N. (West Branch) for the 10yr-24hr Storm Event

10463 17516 106011750717506175171060017493105991059817508175101046510464

11471 12089 12610125901254712468122691213211984119791196911951119151188111706

2.25’(1)

2.5’(1)

4.5’(2)

4.5’(2)4.5’(2)

4.5’(2)

4.5’(2)

4.5’(2)4.5’(2)

2.5’(1)

2.5’(1)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F19_10603


ExistingGrade

5.5’(2)

5.5’(2)

6’(2)

4’(1)

4’(1)

4’(1)

4’(1)

N. Oakland St. and N. Pershing Dr. to S. Glebe Rd. and 1st Rd. S. for the 10yr-24hr Storm Event

10603 10660 10670222161761717571176141066310602105041750310604

11978 12846 1349713227131541296412940127561264712610124621226212080

6’(2)

7’(2)

7’(2)

7’(2)7’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F20_17669


Existing Grade

7’(2)

8’(2)8’(2)

7’(2)

7’(2)7’(2)

7’(2)7’(2)

S. Glebe Rd. and 1st Rd. S. to S. Oakland St. and 3rd Rd. S. for the 10yr-24hr Storm Event

17669 10732 1073410733107311073010797176721767017671

13785 13742 14357 1437714247140531390913873136081349713621

3’(1)

3’(1)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F22_10637


Existing Grade

N. Thomas St. North of Arlington Blvd. for the 10yr-24hr Storm Event

10637 10642 1765425444254431064110640106391063820886

13022 13323 136161356925169134871331713240131691309413035

3’(1)

3’(1)

3’(1)

3.5’(1)

3’(1)

3’(1)

3’(2)

3’(2)

3’(2)

3’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F22_25126


ExistingGrade

6’(1)

4.5’(2)

4.5’(2)4.5’(2)4.5’(2)

4.5’(2)4.5’(2)Additional Piping System

4.5’ Additional Pipe


S. Glebe Rd. and 6th St. S. to S. Oakland St. and 3rd St. S. for the 10yr-24hr Storm Event

25126 1079117668

10739 17668107381073710792107362495024949107801169525127

14587 14243 14364 1437714341143181427914267142022475314320144631454024888

3’(1)

4.5’(1)

3.5’(1)4.5’(1)

3.5’(1)

4.5’(1)

3.5’(2)3.5’(2) 3.5’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F23_11663


ExistingGrade

8’(2)

8’(2)

8’(2)

S. Oakland St. and 3rd St. S. to South of National Foreign Affairs Training Center for the 10yr-24hr Storm Event

11663 21172 2116921168177281166411661

14377 15016 154791503114904146771454214499

8’(1)

8’(1)

Stream

Stream


ExistingModel HGL

WBG120412151936WDC_DB_F24_6896


ExistingGrade3’(1)

4’(1)

4.5’(1)

4.5’(1)

4.5’(1)4.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

4.5’(1)

3’(1)

3’(1)

S. George Mason Dr. from Arlington Blvd. to 6th St. S. for the 10yr-24hr Storm Event

6896 25191 11635 11636252142520225201252002519725195251902518968986897

13687 24941 24945 152361512714939249442494214717249362493524934140991394013788

3.5’(2)

3.5’(2)

FinalModel HGL


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F25_21166


Existing Grade

1.75’(1)

1.75’(1)

1.75’(2)

1.75’(2)

S. George Mason Dr. from 4th St. S. to 6th St. S. for the 10yr-24hr Storm Event

21166 11642 11643 11743

15056 15308152761514915066


Existing Model HGL

FinalModel HGL

WBG120412151936WDC_DB_F26_11639


Existing Grade

2.25’(1)

2.25’(1)

2.25’(1)

S. George Mason Dr. and 4th St. S. to South of National Foreign Affairs Training Center for the 10yr-24hr Storm Event

15056 15058 1522915229 15272 15348 154791530815236

4’(2)

4’(2)

4.5’(2)

Stream

11744 211731174211637116411164011639


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F27_11745


ExistingGrade


Stream

Stream

Stream

Stream

StreamCulvert

Convertedto Stream

South of National Foreign Affairs Training Center to S. George Mason Dr. and 12th Rd. S. for the 10yr-24hr Storm Event

11745 17774 17816 17814 17909 17911179101791417815252831776917772a17773

15479 16475 17159 1719017097169801681816730167231615916050159211586115750


7’(1)6’x6’(2)

7’(1)6’x6’(2)

7’(1)6’x6’(2) 7’(1)

7’(1)

7’(1)

7’(1)

6’x6’(2)6’x7’(2)

6’x7’(2)

6’x7’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F28_11716


ExistingGrade

3’(1)

Stream

8th St. S. from S. George Mason Dr. to Four Mile Run for the 10yr-24hr Storm Event

11716 11717 17775

15965 15922 15928 15921

3’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F28_11778


ExistingGrade

3’(2)

9th St. S. and S. Monroe St. to West of S. Oakland St. and Columbia Pike for the 10yr-24hr Storm Event

11778 11872 23683 178681786621240 2124117848178472368217854118731177311772

15787 16057 16130 163781626416169161531615016110237141610815999159631586015803

3’(1)3’(2)

3.5’(2)3.5’(2)

3.5’(2)

3.5’(2)

3’(2)

3’(2) 3’(2)3’(2)

3’(2)

3’(2)

3’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F29_17869


ExistingGrade

4’x4’(1)

Columbia Pike to S. Quincy St. for the 10yr-24hr Storm Event

17869 17855 2124217857178561786017859

16378 16441 16535 1685516698164931643016387

3.5’(2)

3.5’(2)

4’(2)

3.5’(2)


ExistingModel HGL

ExistingGrade

FinalModel HGL

WBG120412151936WDC_DB_F31_11852




7’ Additional Pipe4’(1)4’(1)

4’(1)

4’(2)

S. Quincy St. to S. George Mason Dr. and 12th Rd. S. for the 10yr-24hr Storm Event

11852 21253 17936 1794117935179342125217937179401185411853

16855 16869 17074 171901717817096170851709917022169641686616861


5’(1)

4’(1)

5’(1)

6’(1)

6’(1)7’(1)

7’(1)

5’(1)5’(1)

5’(1)

5.5’(1)

5.5’(1)

5.5’(1)Additional Piping System


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F32_11930


ExistingGrade

2.25’(1)

2’(1)

2’(1)

2’(1)

S. Pollard St. and 14th St. S. to S. Quincy St. and 13th St. S. (West Branch) for the 10yr-24hr Storm Event

17923 17938 11950 11952 2523511953

11951

17535 1724917405 17429 17272172591733617436

2’(2)2’(2)

2’(2)

2’(2)


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F33_11938


ExistingGrade





3’(1)

4’x4’(1)

S. Quincy St. and 13th St. S. to S. Quebec St. Cul-de-sac for the 10yr-24hr Storm Event

17249 170991705417184 1710917230


2’(1)

3’(1)

2’(1)

3’(1)

2’(1)

4’(1)

2’(1)

4’(1)

3.5’(1)

11938 17932 179331194011939


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F34_17915


ExistingGrade

S. George Mason Dr. from 12th Rd. S. to South of 13th Rd. S. for the 10yr-24hr Storm Event

17915 25129 13511 13526 1353213530135281352413512214181355117942179291792817944

17190 17509 18036 18246 185021841118351183271812018080177611771717562174301739017198

6’x10’(3)6’x10’(3)

6’x10’(3)6’x10’(3)

6’x10’(3)6’x10’(3)

6’x10’(3)

6’x10’(3)6’x10’(3)

6’x10’(3)

Stream


ExistingModel HGL

FinalModel HGL

WBG120412151936WDC_DB_F35_13664


ExistingGrade

8’x10’(3)

Stream

Stream

CulvertConvertedto Stream

South of S. George Mason Dr. and 13th Rd. S. to S. Four Mile Run Outfall for the 10yr-24hr Storm Event

13664 13660 25289 1364218420184192141621415252902141213661136751367413643a

18502 18679 25018 19005 1906419043190241899018977189251879218758186411862818581


109

5 Summary The focus of this task was to develop solutions that eliminate flooding in the model during two selected storm events: the June 2006 storm event and the 10yr-24hr SCS Type II storm. Though specific model solutions were developed, the goal of the task was to understand what design capacity may be necessary to minimize the risk of flooding during similar rainfall events.

The hydraulic modeling results presented in this TM should be reviewed with the understanding that several assumptions were made to fill data gaps, primarily assumptions about pipe inverts, rim elevations, and inlet conditions. Additionally, when solutions were developed, the number of barrels and/or pipe sizes was the primary parameter adjusted. Implementation of these or similar solutions will not guarantee the elimination of flooding in the watershed.

Because of the assumptions applied to the model, it is important to note that all results are presented from a modeling perspective, not a design perspective. Assumptions should be verified and may need adjusting during the design stage of all improvement projects. Moreover, there are many factors related to scoping and implementing a project that will need to be taken into account with the model results when improvement projects are considered. Additionally, even after completion of the improvement projects, the risk of flooding is never completely eliminated.

Results of the design iterations show that flooding in the model during the June 2006 storm event may be eliminated by adding capacity to about 9 percent of the modeled network. Eliminating flooding in the model during the10yr-24hr SCS Type II storm requires changes throughout the network. The solution identified in the TM requires adding capacity to approximately 40 percent of the modeled pipe network.

Capacity Analysis

stormwater capacity analysis for doctor’s branch watershed · 2015. 3. 18. · 16 n. quincy st....

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