hy-8 version 7.2 build date january 17, 2012 · ... crc wants to replace the existing culvert with...
TRANSCRIPT
![Page 1: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/1.jpg)
• HY-8 Version 7.2 Build Date January 17, 2012
• Federal Highway Administration
http://www.fhwa.dot.gov/engineering/hydraulics/software/hy8/index.cfm
![Page 2: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/2.jpg)
SIMPLESimple to use
Use for simple culverts and bridges
Normally it would not be used for complicated projects, such as bridges with piers or when precise stream
profiles are needed. Also, it will not run with an open channel without a structure
![Page 3: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/3.jpg)
Sample Problem• Replace an existing culvert with a larger culvert
• Issue: CRC wants to replace the existing culvert with a longer culvert. The proposed design increases the size of the culvert as well. Will the larger culvert offset the fact that the culvert will be longer?
• Existing Culvert:– Length-- 32’.– CMP, 42” diameter– Low point of road: el 588.20– Width of road: 18 feet– Stream bottom sandy but stony– Stream banks weedy with small brush– Stream bottom elevation 579.00
• Proposed Culvert:– Length– 54’.– Concrete Elliptical, 60”x38”– Road elevations and width will remain the same
![Page 4: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/4.jpg)
Data Acquisition
Flood Discharge Information
Obtained from DEQ-WRD Hydrologic Studies and Dam Safety Unit
http://www.michigan.gov/deq/0,4561,7-135-3313_3684_3724-168812--,00.html
![Page 5: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/5.jpg)
![Page 6: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/6.jpg)
Data Acquisition
#
Channel SlopeObtained from survey data or topo mapsMeasure distance along stream between contoursChannel Slope = rise/run
![Page 7: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/7.jpg)
Data AcquisitionManning’s n (Channel)
• Several references for Manning’s n for various stream conditions• “Open Channel Hydraulics”, Chow 1959 contains an extensive compilations of n values• References typically provide color photo with tables of calibrated n values for a range of flows.
![Page 8: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/8.jpg)
Data AcquisitionProject Survey and Design DataStream Channel Shape and Streambed Invert Elevation
Culvert Inlet Conditions, Culvert dimensions & Type
Existing and Proposed Road Grade, Width, Crest Length
![Page 9: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/9.jpg)
Start Project
![Page 10: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/10.jpg)
Data Input
![Page 11: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/11.jpg)
Data Input
![Page 12: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/12.jpg)
Analyze CrossingAfter data entry is complete, click “Analyze Crossing”
Create Report
![Page 13: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/13.jpg)
Proposed Design
![Page 14: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/14.jpg)
Calculations & Output• Total flow through the Culverts
• Flow through individual culverts
• Weir flow
• Pressure and Weir Flow
• Tailwater Elevations (See HY-8 Help----Limitations)
• Headwater Elevations
• Outlet velocities (See HY-8 Help----Limitations)
• And More….
![Page 15: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/15.jpg)
Culvert Flow
• Cross-section of the culvert
• Slope of the culvert
• “N” value of the culvert
• Manning's equation
• Uses direct step method
![Page 16: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/16.jpg)
Inlet Control vs. Outlet Control
• Computes inlet control headwater elevation, flow passes through critical depth at the culvert entrance and is supercritical in the barrel. The headwater elevation is a function of the entrance size, shape, and inlet type.
• Computes outlet control headwater elevation, the flow in the barrel is subcritical, and the energy equation may be used to find the upstream headwater depth, including entrance & exist losses, and friction losses.
• Uses the higher answer of the two
![Page 17: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/17.jpg)
Weir Flow
• Coefficient of discharge
• Roadway width
• Roadway surface
• Defined roadway
![Page 18: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/18.jpg)
Pressure and Weir Flow• Calculates weir flow
• Uses a built-in submergence factor
• Balances weir and pressure flows at resulting the same headwater elevation.
![Page 19: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/19.jpg)
Analysis
Headwater• How does it compare to what you
expect?• How does it compare to existing high
water marks?• How does it compare to the tailwater?
Tailwater• How does it compare to what you
expect?• How does it compare to existing high
water marks?
Make sure it makes sense and data was input correctly!
![Page 20: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/20.jpg)
Analysis ContinuedCulverts• How much flow per culvert?• What are outlet velocities? • Is it reasonable?• Check inverts and lengths.
Weir Flow• How much water?• Can it really get there?
Compare• How does output compare between
existing and proposed?
![Page 21: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/21.jpg)
CompareProposed = equal or greater hydraulic capacity
![Page 22: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/22.jpg)
“Advanced” Options• Channel Shape and attributes
• Irregular Roadway Profiles
• Culvert Shapes
• Multiple Culverts
• Recessed Culverts
• Simple Bridges
![Page 23: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/23.jpg)
Channel Cross Section Shapes
![Page 24: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/24.jpg)
Standard ChannelCross-Section Shapes
• Trapezoidal
• Rectangular
• Triangular
• User defined
![Page 25: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/25.jpg)
User-defined Channel Cross Sections
• 15 coordinates only• Specify overbank and channel
areas• Mannings “n” values• Input stations and elevations• Channel slopes
![Page 26: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/26.jpg)
User Defined Channel Cross Sections
![Page 27: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/27.jpg)
Roadway Options
• Constant or User Defined Profile
• Roadway width
• Paved or gravel?
• Program calculates coefficient of discharge
![Page 28: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/28.jpg)
User-defined Roadway• Enter 3-15 points
• Station and elevation
• Cannot restrict flow areas
![Page 29: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/29.jpg)
Culvert Options
![Page 30: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/30.jpg)
More Culvert Options
![Page 31: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/31.jpg)
Multiple Culverts
• 99 Barrels
• Different sizes
• Individual inverts and inlet conditions
![Page 32: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/32.jpg)
Embedded Culverts• Typically recessed 6-12 inches
• Reduce total area by recessed area
• Do not change channel inverts
![Page 33: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/33.jpg)
Simple Bridges
• Simple shapes
• Does not handle piers
• Can specify top and bottom of opening
![Page 34: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/34.jpg)
Using User Defined Culvert Shape to Define a Bridge Opening
![Page 35: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/35.jpg)
HY-8 Help will answer many of your questions
![Page 36: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/36.jpg)
Questions?
![Page 37: HY-8 Version 7.2 Build Date January 17, 2012 · ... CRC wants to replace the existing culvert with a longer culvert. The proposed design](https://reader031.vdocuments.us/reader031/viewer/2022021901/5b7da4bd7f8b9ada6d8c9496/html5/thumbnails/37.jpg)
Transportation and the Environment Conference
ContactSheila Meier 906-346-8558Jim Watling 517-284-5508Minmin Shu 517-284-5506
Transportation and Flood Hazard UnitWater Resources Division
Department of Environment Quality
2014