ABSTRACT
This chapter discusses the feasibility of using an analytical method that uses the United States Environmental Protection Agency Stormwater Management Model (SWMM) for continuous simulation. The analysis includes an average annual mass balance and the evaluation of costs and relative benefits to identify project feasibility. The basic component s of the mass balance considered were rainfall, evapotranspiration, runoff, infiltration, groundwater recharge, baseflow, and direct surface discharge. SWMM was calibrated to an average rainfall year and to a month within the average rainfall year using the US Geological Survey (USGS) stage gage at Tiger Bay, results from St. Johns River Water Management District regional groundwater model, and published evaporation rates in a mass balance approach. The rainfall data review showed that 1992 most nearly represents a typical year for rainfall volume. Based on statistics from the USGS Tiger Bay stream gage from approximately 11 years of data, total flow from baseflow and direct surface runoff averages approximately 6.3 inches per year.
