The RDBMS retrieves spatial data from the GIS data base including watershed parameters, network
topology, topography, channel geometry, soil data, land use data, and water quality data. Time series data
were available from a field data station and computed external FORTRAN programs. The results were
stored as relational tables and joined to the network data base as attributes associated with spatial features.
The entire system was integrated through a user friendly, menu-driven interface within the GIS
environment allowing interactive spatial feature display and updating.