Maryland's Approach to SB 227 and Flooding Management

46 46 SWM Quantity Management Questions What precipitation data should we be using for SWM design storm? Existing precipitation or future climate change projections Maryland Department of the Environment Shorter duration storm events (e.g., 3 hour or 6 hour), or continue using 24 hour storm data, or both What type of quantity management design criteria should we be considering? . Statewide quantity mandates for all new development, redevelopment Additional requirements for watersheds with known flooding events New watershed studies and flood management plans be mandated jurisdiction-wide How do we ensure that new criteria do not make flooding worse?

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