toni presnell, p.e. hannum, wagle & cline engineering terre haute, in developing an erosion...
TRANSCRIPT
Toni Presnell, P.E.Hannum, Wagle & Cline Engineering
Terre Haute, IN
Developing an Erosion Control Plan
OverviewRule 5 BackgroundPlan requirementsNarrative SpecificsPlan DevelopmentSummary
Rule 5327 IAC 15
NPDES Permit Rule ProgramGoal
Reduce Sediment Loadings to Water Bodies
Applies to projects of one (1) acre or more
Plan RequirementsTwo (2) Documents Required
1. Narrative2. Construction Drawings
Narrative 3 Sections
1. A – Basic Plan Elements2. B – Active Construction Component3. C – Post Construction Component
Section A- Basic Plan Elements -
A5 – Legal Description of Project
Indiana GIS Atlashttp://129.79.145.7/arcims/statewide_
mxd/viewer.htmSection, Township/Range,
Latitude/Longitude Coordinates
A7 – 14-Digit Hydrologic Unit Code
Indiana GIS AtlasLayers > Hydrology > Watersheds &
Quality > Watershed HUC14
A8 – State or Federal Water Quality Permits
StateIndiana Permit Wizard
http://www.in.gov/ai/appfiles/permitwizard
A10 – Wetlands, Lakes, Water Courses
Indiana GIS Atlasa) Layers > Hydrology > Hydrography
> Wetlandsb) Layers > Reference > Contours…>
Topo Map (USGS)
A12 – Potential Discharge to Groundwater
Indiana GIS AtlasLayers > Hydrology > Hydrogeology >
Sinkhole Areas…
A13 – 100 Year FloodplainsFIRM MapsFEMA
http://msc.fema.gov/webapp/wcs/stores/servlet/FemaWelcomeView?storeId=10001&catalogId=10001&langId=-1
FIRMettes > Map SearchFind Location of ProjectCollect FIRM Map #Go to Product Catalog & Create FIRMette as
A14 – Peak DischargePre/Post-ConstructionNo Proposed Detention, Single
WatershedRational Method: Q = C*I*A
No Proposed Detention, Multiple WatershedsTR-55 Method
Proposed Detention and/or Pipe SystemComputer Software
A18 – Soils Map and Descriptions
MapsNRCS Website
http://websoilsurvey.nrcs.usda.gov/app/
DescriptionsProvide soil limitations for specific
type of construction activity
Section B- Active Construction -
Principles of Erosion & Sediment Control
1. Control erosion on site
2. Capture sediment on site
3. Control outlet energy to control
off-site erosion
B4 – Sediment Control: Sheet Flow
Low Depth, Low VelocityLawns, roofs, driveways, parking
lots, etc.Acceptable Erosion Control
PracticesSilt FencesStraw Bale DamVegetative Filter StripEtc.
B5 – Sediment Control: Shallow Concentrated
Flow
Greater Depth, Greater VelocityDitches, swales, etc.Acceptable Erosion Control
PracticesErosion Control Blankets (Velocity< 5
fps|Slope<5%)Rip-rap Lining (Greater
velocities/slopes)
B6 – Storm Sewer Inlet Protection
Curb & Paved Area InletsStone BagBlock & Gravel
Drop InletsGeotextile Fabric Block & GravelStraw BaleExcavatedEtc.
B7 – Runoff Control Measures
Control Direction, Quantity/Velocity of water
Type of Practice Used dependent upon Need
NEED to Control…
USE…
Direction Diversion Dikes/Ridges, Temp. Slope Drain
Velocity Rock Check Dam, Grade Breaks, Water Bar
B8 – Stormwater Outlet Protection
Reduce outlet energy, reduce scour erosion
Acceptable Erosion Control PracticesEnergy Dissipater (Rip-rap)Rock-Lined Chute (Rip-rap)Concrete Block ChuteEtc.
B9 – Grade StabilizationMay not be necessaryAcceptable Erosion Control Practices
Rock-lined chutesToe wallsDrop StructuresEtc.
B11/12 – Surface Stabilization
Most Important EC MeasureControl Erosion On Site
Establish vegetation/Soil Cover on Unvegetated Areas
Acceptable Erosion Control PracticesSeeding (Temporary/Permanent)MulchingErosion Control Blankets (Steep Grades)Rip-Rap Slope Protection
Plan Development1. Obtain Proposed Topography2. Locate Boundary of Land Disturbance3. Add Construction Entrance (if Necessary) – [B3] 4. Map out Flow Directions for Entire Watershed5. For Each Flow Path:
a) Add Appropriate Sediment Control Device – [B4/5]
6. Identify Storm Sewer/Water Conveyance Inletsa) Determine if Sediment might go into inletb) Add Appropriate Inlet Protection Devices – [B6]
Plan Development7. Significant Off-Site Drainage Coming on-site?
a) Add Appropriate Diversion Devices – [B7]
8. Significant Drainage over Severely Grades Slopes?
a) Add Appropriate Grade Stabilization Structures – [B7/9]
9. Identify Stormwater Discharge Locationsa) Add Appropriate Outlet Protection Devices – [B8]
10. Identify Disturbed Areasa) Add Appropriate Surface Stabilization – [B11/12]
Plan Development11. Concrete Work Required?
a) Design Concrete Washout Area
12. Other ‘Special’ Measures Requireda) Add Appropriate Measures
13. Finished