toni presnell, p.e. hannum, wagle & cline engineering terre haute, in developing an erosion...
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Toni Presnell, P.E.Hannum, Wagle & Cline Engineering
Terre Haute, IN
Developing an Erosion Control Plan
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OverviewRule 5 BackgroundPlan requirementsNarrative SpecificsPlan DevelopmentSummary
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Rule 5327 IAC 15
NPDES Permit Rule ProgramGoal
Reduce Sediment Loadings to Water Bodies
Applies to projects of one (1) acre or more
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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
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Section A- Basic Plan Elements -
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A5 – Legal Description of Project
Indiana GIS Atlashttp://129.79.145.7/arcims/statewide_
mxd/viewer.htmSection, Township/Range,
Latitude/Longitude Coordinates
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A7 – 14-Digit Hydrologic Unit Code
Indiana GIS AtlasLayers > Hydrology > Watersheds &
Quality > Watershed HUC14
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A8 – State or Federal Water Quality Permits
StateIndiana Permit Wizard
http://www.in.gov/ai/appfiles/permitwizard
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A10 – Wetlands, Lakes, Water Courses
Indiana GIS Atlasa) Layers > Hydrology > Hydrography
> Wetlandsb) Layers > Reference > Contours…>
Topo Map (USGS)
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A12 – Potential Discharge to Groundwater
Indiana GIS AtlasLayers > Hydrology > Hydrogeology >
Sinkhole Areas…
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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
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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
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A18 – Soils Map and Descriptions
MapsNRCS Website
http://websoilsurvey.nrcs.usda.gov/app/
DescriptionsProvide soil limitations for specific
type of construction activity
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Section B- Active Construction -
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Principles of Erosion & Sediment Control
1. Control erosion on site
2. Capture sediment on site
3. Control outlet energy to control
off-site erosion
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B4 – Sediment Control: Sheet Flow
Low Depth, Low VelocityLawns, roofs, driveways, parking
lots, etc.Acceptable Erosion Control
PracticesSilt FencesStraw Bale DamVegetative Filter StripEtc.
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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)
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B6 – Storm Sewer Inlet Protection
Curb & Paved Area InletsStone BagBlock & Gravel
Drop InletsGeotextile Fabric Block & GravelStraw BaleExcavatedEtc.
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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
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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.
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B9 – Grade StabilizationMay not be necessaryAcceptable Erosion Control Practices
Rock-lined chutesToe wallsDrop StructuresEtc.
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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
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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]
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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]
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Plan Development11. Concrete Work Required?
a) Design Concrete Washout Area
12. Other ‘Special’ Measures Requireda) Add Appropriate Measures
13. Finished