StateMod, the State of Colorado's Water Resource Planning Model, is a water allocation and accounting model that uses the Prior Appropriation Doctrine for comparative analyses of historic and future river basin water management policies. Suitable for water rights and water allocation modeling, especially in the Western United Sates, StateMod has been applied successfully to the Colorado, Gunnison, Yampa, White, San Juan and Rio Grande River Basins for endangered species and interstate compact evaluations. The model's operations are defined by hydrology, water rights, and associated structures and operating rules. The model recognizes, ranks, and locates in the basin system five types of water rights: direct flow, instream flow, reservoir storage, well, and operational rights, and then simulates operation of the water rights using the Prior Appropriation Doctrine (first in time, first in right).

StateMod Interface Displaying Gunnison Basin Data

RTi developed the standard tools used and distributed by the State for automating the preparation of StateMod model files from the State's HydroBase database and other data sources. RTi also developed the StateMod graphical user interface (GUI). As part of the Colorado River Decision Support System (CRDSS), RTi developed StateMod data sets for the Colorado, Gunnison, San Juan, Yampa, and White River Basins. For accurate basin system representations in the model data sets, RTi's CRDSS work involved extensive research into the operations of the water projects in each basin. Each basin model was calibrated for historical conditions and then extended to develop a baseline for analysis of current conditions and potential alternative scenarios. RTi implements StateMod as well as other solutions for water supply and allocation modeling, and also provides as-needed services, including review of model data sets, training, and tool development to streamline data set preparation and the evaluation of results.

StateMod Diversion Graph Illustrating
Monthly and Daily Data