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Trees and Stormwater Calculator Tool

The Trees and Stormwater Calculator Tool is intended to simulate the impact of increasing or decreasing urban tree canopies upon stormwater runoff yield.

The tool integrates average rainfall event data from local weather stations with high-resolution spatial (GIS) data representing land cover and soils to approximate the complex interactions of tree canopies, land surface cover, soils and storm events. The curve number method developed by the US Department of Agriculture’s Natural Resources Conservation Service (NRCS) forms the basis of the model, with modifications suggested by recent studies conducted for the Chesapeake Bay Conservation program. The tool was tested in 12 communities across the south and the summary report as well as case studies for each community can be found at

Green Infrastructure Center

Trees and Stormwater Calculator Tool

Stormwater Management, Infrastructure (green), Hydrology, Water Quality/Quantity
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