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

*.pdf

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