Post-Construction Infiltration Practices Table 4b
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1 Post-Construction Infiltration Practices Table 4b Jay Dorsey, PE, PhD Ohio State University Stormwater Management Program Bowling Green, Ohio September 18, 2018
2 Table 4b Infiltration Post-Construction Practices with Maximum Drain Times Infiltration Practices Maximum Drain Time of WQv Bioretention Area/Cell 1,2 24 hours Infiltration Basin 2 24 hours Infiltration Trench 3 48 hours Permeable Pavement Infiltration 3 48 hours Underground Storage Infiltration 3,4 48 hours What did the Construction General Permit change? What changed in the Rainwater manual? Key design considerations Common issues/challenges
3 What did the permit change? Underground infiltration system added as preapproved post-construction WQv treatment practice Updated criteria for maximum WQv drain time Practices (bioretention, infiltration basin) with surface storage of WQv must drain within 24 hours Practices (infiltration trench, permeable pavement, underground infiltration system) with subsurface storage of WQv must drain within 48 hours
4 Rainwater Manual For brevity the Rainwater and Land Development Manual will be referred to as the Rainwater manual
5 WQv Compliance Spreadsheet Available for download at Summit SWCD website:
6 Infiltration Basin Source: Minnesota Pollution Control Agency Source: Selbig and Bannerman, 2008
7 Infiltration Basin What did the permit change? BMPs with WQv stored aboveground must fully drain within 24 hours (48 hours in previous permit) What is changing in the Rainwater manual? Practice will be added to Rainwater manual - provisional practice available
8 Infiltration Basin Key Design Considerations Soil infiltration rate (Ksat) > 0.50 in/hr Sites with gravelly soils or coarse sands (e.g., glacial outwash soils; typically Ksat > 4 in/hr) will not provide adequate runoff treatment to prevent groundwater contamination. These sites require placement of a 12 (minimum) bioretention media filter on the infiltration bed to provide the necessary water quality treatment.
9 Infiltration Basin Key Design Considerations Soil infiltration rate (Ksat) > 0.50 in/hr Minimum infiltration area (A infiltration > 0.05*A impervious )
10 Minimum Infiltration Area A infiltration > A impervious 0.05*A impervious A infiltration
11 Infiltration Basin Key Design Considerations Soil infiltration rate (Ksat) > 0.50 in/hr Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment
12 Infiltration Basin Key Design Considerations Soil infiltration rate (Ksat) > 0.50 in/hr Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment Vegetation selection
13 Vegetation Selection Source: Minnesota Pollution Control Agency Source: Selbig and Bannerman, 2008
14 Infiltration Basin Common Issues and Challenges Grading Clogging due to sediment Construction phasing
15 Clogging Due to Sediment Source: Brian Prunty, Summit SWCD
16 Infiltration Basin Common Issues and Challenges Grading Clogging due to sediment Maintenance Vegetation management
17 Maintenance
18 Vegetation Maintenance Source: Minnesota Pollution Control Agency Source: Hydro International
19 Source: Scott Sonnenberg Infiltration Trench
20 Infiltration Trench What did the permit change? Nothing What changed or will be changing in the Rainwater Manual? Established minimum infiltration area Ainf > 0.05*Aimp Adjusted Ksat range (0.5 in/hr to 4.0 in/hr)
21 Infiltration Trench Key Design Considerations Soil infiltration rate (Ksat) > 0.50 in/hr Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment
22 Pretreatment No Treatment Sheetflow Source: Scott Sonnenberg
23 Pretreatment
24 Infiltration Trench Common Issues and Challenges Installed in soils with low infiltration capacity trenches do not de-water and by-pass WQv
25 Infiltration Trench Common Issues and Challenges Installed in soils with low infiltration capacity trenches do not de-water and by-pass WQv Clogging due to sediment
26 Bioretention What did the permit change? BMPs with WQv stored aboveground must fully drain within 24 hours Set Ksat range of 1 4 in/hr assumed to be met if the bioretention soil media meets specifications in the Rainwater manual Underdrain required for most situations What changed or will be changing in the Rainwater manual? Will be minor tweaks to soil specification, outlet configurations
27 Bioretention Key Design Considerations Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment Stable discharge of runoff to bioretention cell surface Internal water storage Soil media specification Vegetation selection
28 Bioretention Key Design Considerations Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment Stable discharge of runoff to bioretention cell surface Internal water storage Soil media specification Vegetation selection
29 Concentrated Flow Inlets
30 Bioretention Key Design Considerations Minimum infiltration area (A infiltration > 0.05*A impervious ) Pretreatment Stable discharge of runoff to bioretention cell surface Internal water storage Soil media specification Vegetation selection
31 Base Bioretention Configuration 24 Planting Soil above Invert 6 (min) Planting Soil in IWS with Internal Water Storage
32 Bioretention Decision Framework Base Design depth; IWS Layer HSG A Soils Temperature Nitrogen Treatment Depth Limitations (e.g., Shallow Outlet, High Water Table) HSG D Soils (depending on limitations) High Water Table, Karst, Shallow Bedrock or High Pollution Loads If Kfs > 1 in/hr, may not require underdrain, aggregate, filter 36+ media depth; IWS Layer (>18 ); 48 depth to drain 36 media depth; IWS layer (>18 ), outlet raised >6 into planting media 24 media depth Underdrain w/ 3 of cover & 3 of bedding Impermeable liner
33 Bioretention Common Issues and Challenges Construction contractor unfamiliarity with purpose/key components Construction oversight helps!
34 Bioretention Common Issues and Challenges Construction contractor unfamiliarity with purpose/key components Bioretention soil doesn t meet specifications Clogging due to sediment Maintenance Unfamiliarity with bioretention plants Overmulching
35 Bioretention in Peak Control Basin Oak Grove Subdivision, Columbus, Ohio Engineer: Casey Elliot, Conservation Technologies
36 Bioretention in Peak Control Basin Oak Grove Subdivision, Columbus, Ohio Engineer: Casey Elliot, Conservation Technologies
37 Underground Infiltration System Source: Philadelphia Water Department
38 Underground Infiltration System What did the permit change? Underground stormwater management systems (USMS) both infiltrating and extended detention systems - are a standard practice pre-approved for general use Pretreatment required that is certified to provide 80% TSS removal for infiltrating USMS What will be changing in the Rainwater manual? Practice will be added to Rainwater manual - provisional practice available
39 Underground Infiltration System Open System Pre-T 80% WQF d IWS No Sediment Storage Flood Control Volume Verified Infl. Rate Flood Control Outlet
40 Underground Infiltration System Pretreatment Chamber w/ Open System Pretreatment Chamber WQF & 20% Sediment Storage WQf Diversion Flood Control Vol. d IWS No Sediment Storage Verified Infl. Rate Flood Control & Overflow Outlets
41 Underground Infiltration System Key Design Considerations Pretreatment
42 Pretreatment Pretreatment certified to achieve 80% TSS removal must be provided Certification of acceptable technologies can be found at MTD #1 MTD #2 MTD #3
43 Infiltrating Extended Detention System Pre-T 50% WQF Wet Sump (20% Sediment) WQv above IWS Infiltration Flood Control Volume Outlets
44 Infiltrating Extended Detention System
45 Underground Infiltration System Key Design Considerations Pretreatment Access for inspection and maintenance Access must be provided at inlet and outlet Design/access must allow sediment removal from entire system without flushing to MS4
46 Inspection & Maintenance Access Access manholes at inlet, outlet and within storage as necessary for cleaning Observation wells
47 Should I consider an infiltration practice? What advantage or benefit to the project (or the developer) is provided by using a infiltration practice to meet the post-construction WQv requirement? Cost reduction? Reduce area or depth of practice? Can it help address other site conditions or design challenges? Infiltration practices, by design, should rarely have standing water Infiltration practices may be viable edge of property BMPs
48 Which infiltration practice(s) to consider Soil infiltration capacity (saturated hydraulic conductivity) Site imperviousness Available surface area for basin(s) Distributed or concentrated open space Pretreatment requirement and options Ability to reduce footprint of infiltration BMP by using runoff reduction credit provided by pretreatment practices Peak discharge control
49 Justin Reinhart Ohio EPA Storm Water Technical Assistance Jay Dorsey Ohio State University Stormwater Management Program
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