Integral system for nonpoint source pollution modeling in surface waters

This research describes an integrated system to mode1 nonpoint source pollution in surface waters. Two difise pollution models were implemented in a Spatial Decision Support System (SDSS) with common interfaces and Geographic Information System (GIS) capabilities. The system includes preand pt-processing tools, mode1 control and sensitivity analysis for the models. The construction of the interfaces for the AGNPS (Agiculniral Non-Point Source) mode1 and WATFLOOD (a flood forecast hydrological model) and their link with the decision support systern RAISON (Regional Analysis by Intelligent Systems On microcornputers) are presented. A water quaîity component was cieveloped for the WATFLOOD model in order to ded with sediment and nutrient transport. Using data for the Duffins Creek watershed, the AGNPS model is used to mess the results from the water quality component coupled into WATFLOOD. Hourly measured data for two separate events wen compared against both models. Sensitivity analysis and decision support tools provide a complete setup and the full integration of the system.