Kearney Post-Construction Stormwater Program
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1 Kearney Post-Construction Stormwater Program Stormwater Treatment Facilities (STFs) Kearney Public Works Office August 10 and 17, 2017
2 Stormwater Treatment Facility (STF) Session Goals Understand STF Function Understand Types of STFs and Applicability Overview of STFs 2
3 Filtration Vegetative Soils Artificial Sedimentation Basins Traps Chemical Natural Additive Biological Plants Soil Treatment Mechanisms
4 Pollutant Removal Example
5 Root Systems
6 Landscaping Vegetation is critical Improve infiltration over time Filter sediment Remove pollutants Considerations Salt and Chemicals Aesthetics Plant Types Basin vs. Side Slopes Density Bunch vs. Turf Type Maintenance
7 STF Design Considerations Space Available Topography Drainage Basin Size Infiltration Rates Groundwater Bedrock
8 More BMP Design Considerations Online vs. Offline Major Storm Events Runon Types of Pollutants Cost Capital Maintenance Phasing and Conversions
9 STF Suitability STF Residential Commercial Block Neighborhood Bioretention Area x x x Bioswale/Grass Swale x x x x Dry Retention/Dry Detention x x x Filter Strip x x x x Infiltration Trench x x x Rain Garden x x x Underground Storage Wet Detention x x x Roof Drain Filters x x *The City of Kearney may be amenable to other forms of STF s if properly presented
10 Design Guidance By Community Many Similarities A Few Differences Community Omaha Design Document Omaha Regional Stormwater Design Manual Ch. 8 Stormwater Best Management Practices Lincoln Lincoln Drainage Criteria Manual - Ch. 8 Stormwater Best Management Practices NDOT UDFCD Drainage Design and Erosion Control Manual Ch. 3 Stormwater Treatment within MS4 Communities Urban Storm Drainage Criteria Manual Vol. 3 Best Management Practices 10
11 Design Guidance By Community * UDFCD includes guidance on Constructed Wetland Pond & Constructed Wetland Channel Treatment BMPs Omaha Lincoln NDOT UDFCD Vegetated Filter Strip Grass Swale Infiltration Trench Infiltration Basin Bioretention Basin Media Filter Sand Filter Extended Dry Detention Wet Detention Ponds Stormwater Wetland * Underground Detention Pervious Pavement Proprietary Structural Treatment Controls Green Roofs Soil Conditioning X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 11
12 Treatment BMP Suitability Matrix From NDOT s Chapter 3
13 Vegetated Filter Strip
14 Grass Swale
15 Infiltration Trench
16 Infiltration Basin
17 Bioretention
18 Extended Dry Detention
19 Wet Detention
20 Underground Storage & Roof Drain Filters
21 Design Preferences Based on STF Function Infiltration Rates (for infiltrating STFs) Min Rate 0.5 in/hr Max Rate 12 in/hr Infiltration Cells (when soils don t drain well) Drain Time (24 hrs use valve with infiltration cells to help control rate) Cleanouts (with all underdrains) Pretreatment Grass buffers Barriers Forebays 21
22 Grass Swale
23 Grass Swale
24 QUESTIONS? 24
25 References: City of Kearney, City of Kearney City Code-Chapter 9, Article 16: Construction and Post-Construction Stormwater Code City of Omaha, Omaha Regional Stormwater Design Manual- Chapter 8: Stormwater Best Management Practices City of Lincoln, Drainage Criteria Manual- Chapter 8: Stormwater Best Management Practices NDOR, Drainage and Erosion Control Manual- Chapter 3: Stormwater Treatment within MS4 Communities Urban Drainage and Flood Control District (UDFCD), Urban Storm Drainage Criteria Manual, Volume 3: Stormwater Quality * Post-Construction Stormwater Management Program Supplement will soon be online as a resource for design standards.
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