The MODSIM general purpose decision support system is presented for integrating hydrological and institutional/administrative modeling capabilities in river basin management. MODSIM incluses a powerul graphical user interface allowing interactive placement of river basin network objects on-screen in any configuration. Data import and editing is accomplished through familiar spreadsheet-style tools, with cross-platform implementation on Unix workstations and Windows-based PC's. MODSIM and the GUI development ttake advantage of C++ modularity and integration for future feature capability and maintenance. Capability is provided to distinguish between natural flow water rights and various storage contract arrangements for water entitlement acocunting, exchanges, storage ownerships, water service contracts, and rent pool/water banking. MODSIM is also suitable for conjunctive use studies through an in-built stream-aquifer interfaction model, or linkage with more realistic groundwater models such as MODFLOW through use of unit response functions.
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