Calibration of SWMM-EXTRAN using short-term Continuous Simulation.
As part of the City of Jacksonville Master Stormwater Management Plan (MSMP), a short-term continuous water quantity model calibration was performed for three primary stormwater management systems (PSWMSS) to verify that design storm models accurately simulated a wide range of hydrologic and hydraulic characteristics. This chapter presents a summary of the water quantity methodology used for the Little Sixmile Creek calibration, the calibration results at the stream gage on Little Sixmile Creek, and the impact on the MSMP results. The nine basin plans in the MSMP were completed from 1991 to 1993. This calibration was performed for the month of January 1991. Prior to calibrating the model parameters used in the MSMP to the Little Sixmile Creek gage, the peak stages computed by Camp Dresser & McKee Inc.'s (CDM's) Version of the United States Environmental Protection Agency (EPA) Storm Water Management Model (SWMM) MSMP RUNOFF and EXTRAN blocks were within 0.5 ft (150 mm) of the measured peak stages for all of the events during the calibration period, and most peak stages were within 0.2 ft (60 mm). The calibration was used to make small adjustments in runoff volume, timing, and peak. Changes from the MSMP results based on the calibrated parameters were less than 0.5 ft (150 mm) at all locations along the PSWMS.
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