In 2006, MSD established performance requirements for post-construction BMP requirements in its Rules and Regulations and adopted Chapters 3 and 5 of the 2000 Maryland Stormwater Design Manual (Maryland Manual). The Maryland Manual provides the methodology for designing many kinds of post-construction stormwater BMPs, including stormwater ponds, infiltration BMPs, filtering systems, open channel systems, stormwater wetlands, and stormwater credits (e.g., natural area conservation and impervious area disconnection). MSD anticipated that it would be necessary to adapt its rules and the Maryland Manual to local conditions and requirements. A primary goal of the BMP toolkit is to share these adaptions. Click on the technology names below to find design, construction, and maintenance information on the technologies most commonly used in MSD.
|Volume Reduction||Water Quality Treatment||Channel Protection Storage||Peak Flood Detention Storage|
|Permeable Pavement||Yes||Yes||Yes||Qpv Reduction Only*|
|Amended Soils Disconnection||Yes||Yes||CPv Reduction Only*||Qpv Reduction Only*|
|Rainwater Harvesting||Yes||WQv Reduction Only||CPv Reduction Only*||Qpv Reduction Only*|
|Green Roof||Yes||WQv Reduction Only||CPv Reduction Only*||Qpv Reduction Only*|
|Sheet Flow to Buffer (Credit)||Yes||Yes||CPv Reduction Only*||Qpv Reduction Only*|
|Stormwater Ponds and Wetlands||No||Yes||Yes||Yes|
|Proprietary BMPs||No||Technology Dependent||Technology Dependent||Technology Dependent|
|Open Channel Use (Credit)||No||Yes||No||No|
|Dry Detention Basin||No||No||Yes||Yes|
*By curve number modification. See calculation tools.
Selection of post-construction stormwater BMPs for a site depends in part on regulations. The technology matrix indicates the function that MSD typically recognizes for the most commonly used BMPs. Examples of how BMP technologies are used to meet stormwater management requirements are below.
Click here for: Artificial Playing Field Performance and Design Criteria