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2	Strategy for coping with polluted runoff improved water quality flood control more stable watershed can be aesthetically pleasing
3	Best Management Practices & Remediation Strategies for Coping With Polluted Runoff
4	What is a Best Management Practice? SC DHEC says a BMP is… a storm water management and conservation practice that has been demonstrated to effectively control movement of pollutants, prevent degradation of soil and water resources, and are compatible with the land use
5	An Easier Way to Understand BMPs….
6	Traditional Drainage Systems collect, concentrate, convey
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9	Types of Urban Structural BMPs
10	Types of BMPs Stormwater Wetlands shallow marsh ED shallow wetland pond/wetland system Infiltration bio-retention areas sand filters permeable pavers Filtration riparian buffers level spreaders open channel/swale Stormwater Ponds wet pond wet ED pond multiple pond system “pocket pond”
11	Riparian Buffers
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15	Financial Benefits Minimizes property damage from flooding and storm surge Decreased public investment needs Increased property values Burby, 1998 Schueler, 1995 Reduced maintenance costs
16	All Buffers Are Not the Same... Slope Vegetation Soil type Width Design Management
17	Filtration/Riparian Buffers Advantages trap sediment remove nutrients suspend pollutants control temperature provide flood protection Disadvantages limited land use within the buffer
18	Open Channels/Swales
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27	Open Channels/Reinforced Swales Advantages can carry high flows of water aesthetically pleasing easy to maintain cheaper than rip-rap alternatives promotes infiltration Disadvantages no long term testing highly variable pollutant removal
28	Stormwater Ponds
29	Wet Detention Pond Schematic
30	Wet Detention Pond Cross Section
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36	Stormwater Pond Costs
37	Stormwater Ponds Advantages traditional…everybody’s doing it can double as recreational facility good at removing TSS, FC Disadvantages relatively land intensive safety issues poor removal of N, TP
38	Stormwater Wetlands
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40	Stormwater Wetland Features
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48	Wetland Construction Costs
49	Stormwater Wetlands Advantages highest pollutant removal option TSS, FC, N, TP good educational sites Disadvantages most land intensive public opinion can be negative difficulty with permitting
50	Bioretention
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54	Bio-Retention Schematic
55	Bio-Retention Water Table
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62	Change from Traditional Grading
63	Bioretention Construction Costs
64	Bioretention Advantages aesthetically pleasing can meet landscape and WQ requirements TSS, TN removal is high Disadvantages new practice, not a lot of data plants must be removed if soil clogs
65	Sand Filters
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69	Sand Filters Advantages can fit in high cost land situations removes pollutants found in parking lots TSS, heavy metal removal high Disadvantages most expensive per square foot of device maintenance can be cumbersome
70	Permeable Pavers
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77	Permeable Pavement CHECKLIST Low Traffic Volume Sandy or Sandy-Loam Soil Water Table at Least 4 Feet from Soil Surface Little “Upstream” Disturbance Proper Design Proper Construction Proper Maintenance
78	Permeable Pavers Advantages low design and construction costs introduces surface water to ground water Disadvantages limited application (sandy soils) high potential for clogging little to no N, P removal
79	Best Management Practices & Remediation Strategies for Coping With Polluted Runoff
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