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California Phase II LID Sizing Tool - v1.1

Welcome to the California Phase II Low Impact Development (LID) Sizing Tool. This is a web-based tool that assists stormwater practitioners in selecting and sizing LID Best Management Practices (BMPs) that meet the sizing requirements set forth in California’s National Pollutant Discharge Elimination System (NPDES) permit for stormwater discharges from small municipal separate storm sewer systems (MS4s).

Development of this tool was funded by the California State Water Resources Control Board’s (SWRCB) Proposition 84 Stormwater Grant Program (SWGP) and the California Department of Parks and Recreation

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