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Toni Presnell, P.E. Hannum, Wagle & Cline Engineering Terre Haute, IN Developing an Erosion Control Plan.

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Presentation on theme: "Toni Presnell, P.E. Hannum, Wagle & Cline Engineering Terre Haute, IN Developing an Erosion Control Plan."— Presentation transcript:

1 Toni Presnell, P.E. Hannum, Wagle & Cline Engineering Terre Haute, IN Developing an Erosion Control Plan

2 Overview Rule 5 Background Plan requirements Narrative Specifics Plan Development Summary

3 Rule 5 327 IAC 15 NPDES Permit Rule Program Goal Reduce Sediment Loadings to Water Bodies Applies to projects of one (1) acre or more

4 Plan Requirements Two (2) Documents Required 1. Narrative 2. Construction Drawings Narrative 3 Sections 1. A – Basic Plan Elements 2. B – Active Construction Component 3. C – Post Construction Component

5 Section A - Basic Plan Elements -

6 A5 – Legal Description of Project Indiana GIS Atlas htm htm Section, Township/Range, Latitude/Longitude Coordinates

7 A7 – 14-Digit Hydrologic Unit Code Indiana GIS Atlas Layers > Hydrology > Watersheds & Quality > Watershed HUC14

8 A8 – State or Federal Water Quality Permits State Indiana Permit Wizard

9 A10 – Wetlands, Lakes, Water Courses Indiana GIS Atlas a) Layers > Hydrology > Hydrography > Wetlands b) Layers > Reference > Contours…> Topo Map (USGS)

10 A12 – Potential Discharge to Groundwater Indiana GIS Atlas Layers > Hydrology > Hydrogeology > Sinkhole Areas…

11 A13 – 100 Year Floodplains FIRM Maps FEMA emaWelcomeView?storeId=10001&catalogId=10001 &langId=-1 emaWelcomeView?storeId=10001&catalogId=10001 &langId=-1 FIRMettes > Map Search Find Location of Project Collect FIRM Map # Go to Product Catalog & Create FIRMette as *.pdf

12 A14 – Peak Discharge Pre/Post-Construction No Proposed Detention, Single Watershed Rational Method: Q = C*I*A No Proposed Detention, Multiple Watersheds TR-55 Method Proposed Detention and/or Pipe System Computer Software

13 A18 – Soils Map and Descriptions Maps NRCS Website Descriptions Provide soil limitations for specific type of construction activity

14 Section B - Active Construction -

15 Principles of Erosion & Sediment Control 1. Control erosion on site 2. Capture sediment on site 3. Control outlet energy to control off-site erosion

16 B4 – Sediment Control: Sheet Flow Low Depth, Low Velocity Lawns, roofs, driveways, parking lots, etc. Acceptable Erosion Control Practices Silt Fences Straw Bale Dam Vegetative Filter Strip Etc.

17 B5 – Sediment Control: Shallow Concentrated Flow Greater Depth, Greater Velocity Ditches, swales, etc. Acceptable Erosion Control Practices Erosion Control Blankets (Velocity< 5 fps|Slope<5%) Rip-rap Lining (Greater velocities/slopes)

18 B6 – Storm Sewer Inlet Protection Curb & Paved Area Inlets Stone Bag Block & Gravel Drop Inlets Geotextile Fabric Block & Gravel Straw Bale Excavated Etc.

19 B7 – Runoff Control Measures Control Direction, Quantity/Velocity of water Type of Practice Used dependent upon Need NEED to Control…USE… DirectionDiversion Dikes/Ridges, Temp. Slope Drain VelocityRock Check Dam, Grade Breaks, Water Bar

20 B8 – Stormwater Outlet Protection Reduce outlet energy, reduce scour erosion Acceptable Erosion Control Practices Energy Dissipater (Rip-rap) Rock-Lined Chute (Rip-rap) Concrete Block Chute Etc.

21 B9 – Grade Stabilization May not be necessary Acceptable Erosion Control Practices Rock-lined chutes Toe walls Drop Structures Etc.

22 B11/12 – Surface Stabilization Most Important EC Measure Control Erosion On Site Establish vegetation/Soil Cover on Unvegetated Areas Acceptable Erosion Control Practices Seeding (Temporary/Permanent) Mulching Erosion Control Blankets (Steep Grades) Rip-Rap Slope Protection

23 Plan Development 1. Obtain Proposed Topography 2. Locate Boundary of Land Disturbance 3. Add Construction Entrance (if Necessary) – [B3] 4. Map out Flow Directions for Entire Watershed 5. For Each Flow Path: a) Add Appropriate Sediment Control Device – [B4/5] 6. Identify Storm Sewer/Water Conveyance Inlets a) Determine if Sediment might go into inlet b) Add Appropriate Inlet Protection Devices – [B6]

24 Plan Development 7. 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 Locations a) Add Appropriate Outlet Protection Devices – [B8] 10. Identify Disturbed Areas a) Add Appropriate Surface Stabilization – [B11/12]

25 Plan Development 11. Concrete Work Required? a) Design Concrete Washout Area 12. Other Special Measures Required a) Add Appropriate Measures 13. Finished

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