| This research identifies suburban simulation features in an existing hydrochemical model, the Windows Hydrologic Simulation Program in Fortran (WinHSPF). Simulation occurs in the 2.8 houses ha-1 "B28" subbasin of 55.5 ha, subbasin of the 969 km 2 Croton watershed supplying New York City with 10% of its drinking water. Monitoring of B28 from 2001--2002 revealed that storm sewers and septic systems affected runoff timing and magnitude. Adjustments to WinHSPF included defining sub-basin delineation by storm sewer catch basin watersheds rather than surface streams, refining the default simulation time step from daily to 10 minute, and programming inter-basin transfers of water from deep aquifers to the septic leach field. Parameterization of WinHSPF enabled more accurate simulation of suburban runoff timing and magnitudes. This research provides watershed managers a guide to simulate Low Impact Development scale Best Management Practices processes internal to a suburban watershed, such as bioretention facilities. |
