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Chapter 4
Treatment BMPs
Table 4-1. General Overview of Treatment BMPs Included in Volume 3
Overview Grass Swale Grass Buffer
Bioretention
(Rain
Garden)
Extended
Green Roof 5 Detention
Basin
Sand Filter
Retention
Pond
Constructed
Wetland
Pond
Constructed
Wetland
Channel
Permeable
Pavement
Underground
BMPs
Functions
LID/Volume Red. Yes Yes Yes Yes Somewhat Yes Somewhat Somewhat Somewhat Yes Variable
WQCV Capture No No Yes Yes Yes Yes Yes Yes No Yes Variable
WQCV+Flood Control No No Yes No Yes Yes Yes Yes No Yes Variable
Fact Sheet Includes
EURV Guidance
Typical Effectiveness for Targeted Pollutants 3
No No No No Yes No Yes Yes No No No
Sediment/Solids Good Good Very Good 1 Unknown Good Very Good 1 Very Good Very Good Unknown Very Good 1 Variable
Nutrients Moderate Moderate Moderate Unknown Moderate Good Moderate Moderate Unknown Good Variable
Total Metals Good Good Good Unknown Moderate Good Moderate Good Unknown Good Variable
Bacteria Poor Poor Moderate Unknown Poor Moderate Moderate Poor Moderate Unknown Variable
Other Considerations
Life-cycle Costs 4 Low Low Moderate Unknown Moderate Moderate Moderate Moderate Low High 2 Moderate
1 Not recomended for watersheds with high sediment yields (unless pretreatment is provided).
2 Does not consider the life cycle cost of the conventional pavement that it replaces.
3 Based primarily on data from the International Stormwater BMP Database (www.bmpdatabase.org).
4 Based primarily on BMP-REALCOST available at www.udfcd.org. Analysis based on a single installation (not based on the maximum recommended watershed tributary to each BMP).
5
Water quality data for green roofs are not yet robust enough to provide meaningful conclusions about pollutant removal. By reducing volume, green roofs have the de facto capability to reduce pollutant loads;
however, on a concentration basis, more data is needed to better define effectiveness.
November 2010 Urban Drainage and Flood Control District 4-3
Urban Storm Drainage Criteria Manual Volume 3