epa greenscapes: building sustainable sites from the ... · title: epa greenscapes: building...
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Stormwater Landscaping
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Water Quality Compost
• Impaired Waters, Total Maximum Daily Loading
• Storm Water Pollution Prevention Plan– No increase of heavy metal, nutrients,
bacterial, sediments from existing predevelopment
– Contingency planning• Chemical trapping
– Post construction monitoring and maintenance plan
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Storm water
compost gabion living wall
system
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Water Quality Volume
0.5 inch of runoff of new impervious area created
Emergency Spillway
Stabilized Access
2c. Filter-berm Basins
Forebay
Heavy Soils, low permeability
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Table 2. Example Compost Blanket Depths for Various Rainfall Rates
Annual Rainfall/
Flow Rate
Total Precipitation
(Rainfall Erosivity Index)
Compost Blanket Depth
(Vegetated Surface)
Compost Blanket Depth (Unvegetated
Surface)
Low 1 – 25 in. (20 – 90)
½ – ¾ in. (12.5 –19 mm)
1 in. – 1½ in. (25 – 37.5 mm)
Average 26 – 50 in. (91 – 200)
¾ – 1 in. (19 – 25 mm)
1½ in – 2 in. (37 –50 mm)
High >51 in. (>201)
1 – 2 in. (25 – 50 mm)
2 – 4 in. (50 –100 mm)
Alexander, 2003
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Erosion Control Compost
S-xxx.3 MEASUREMENT AND PAYMENTCompost erosion control blanket will be measured by the area furnished and acceptably installed. Payment will be made under Item 2575.604 (Compost, Grade 2 Special) at the Contract bid price per square meter [square yard], which shall be compensation in full for all labor, materials, equipment and other incidentals necessary to complete the work as specified, including the cost of maintenance if specified in the plan. The provisions of Mn/DOT 1903 are modified to the extent that the Department will not make a price adjustment in the event of increased or decreased quantities.
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