AN INTEGRATED STORMWATER MANAGEMENT GIS SOFTWARE SYSTEM

Computing pollutant loadings are increasingly important for master pla nning flood control and environmental systems. In this paper, a stormw ater pollutant estimation analog is coupled to a flood control master planning procedure linked to a GIS capability. The GIS functions devel op land use versus area tabulations that readily input into pollutant loading equations. Because the linkage between the master plan of drai nage databases and the pollutant loading equations is direct, an impor tant advancement can be made in stormwater quantity and quality evalua tion by a modest integration effort between software applications. For application in urban storm runoff management, a simple rainfall-runof f volumetric model can be linked to the stormwater pollutant model to estimate pollutant loadings on a storm event basis. Calibration of the model is achieved by matching mean annual loadings to NURP estimates. (C) 1997 Elsevier Science Ltd.