The Analytical Stormwater Management Model (ASWMM)
This chapter outlines the methodology and procedures used in the development and verification of the Analytical Stormwater Management Model (ASWMM). ASWMM is a collection of analytical expressions relating the runoff characteristics and stormwater detention pond performance measures of urban catchments directly to the input rainfall statistics and system parameters. These analytical expressions are derived from the simplified mathematical representation of the hydrologic and hydraulic processes involved. The input rainfall event characteristics are treated as exponentially distributed random variables. Preliminary testing and verification indicate that the ASWMM results are generally in close agreement with those generated from the U.S. EPA SWMM model. The use of ASWMM is therefore proposed for the planning and design of urban stormwater management facilities.
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