A new approach for a Windows-based watershed modeling system based on a database-supporting architecture

A stand-alone Windows-based watershed modeling system, Loading Simulation Program in C++ (LSPC) is introduced to support simulation of watershed processes and address both point and nonpoint source concerns. The system integrates GIS tools, data management capabilities, a postprocessor, and a dynamic watershed model within a common Windows environment. Great flexibility for user manipulation and customization is offered due to the system's underlying database-supporting architecture. The database, as the backbone of the system, builds a linkage among users' inputs, model data management, and the numerical model by implementing a set of dynamic database queries. This open architecture provides an efficient way for a modeler to customize the system without modifying user interface software. The simulation algorithms of hydrology and water quality are based on the Hydrological Simulation Program - FORTRAN (HSPF). Due to its architecture, the system has proven successful in large-scale watershed modeling efforts that require a high level of resolution, record keeping, and technical transfer.