SWMM Application in Indian River County, Florida

by William C. H. Wang, Williams, Hatfield & Stoner Inc, United States,
Stephen D. Willams, Williams, Hatfield & Stoner Inc, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The EPA's Storm Water Management Model (SWMM) was used to simulate drainage canal system network within Indian River County, Florida. Runoff and Extran module of the PCSWMM 3.3 was used to provide flows and elevation data for design storm drainage conditions. Extran was chosen because of its ability to simulate branched or looped system with the ability to handle tailwater control. It performs a dynamic routing of storm water flows using an explicit solution technique to solve the full dynamic equation for gradually varied flow. A physical system compaction method was developed to improv model run time without sacrificing accuracy. Calibration of both Runoff and Extran module resulted in error within satisfactory levels.

Subject Headings: Runoff | Rivers and streams | Gradually varied flow | Water flow | Model accuracy | Flow simulation | Channel flow | Rain water | Florida | United States

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