Surface Water Hydrology
River Basin Modeling
River basin modeling for water supply projections are carried out on gaged and un-gaged streams utilizing the latest in computer modeling techniques. Historical, present or natural flow studies can be completed, with annual and monthly flow projections, sediment analysis and flood flow analysis. We have extensive experience using Riverware. RiverWare is a generic hydrological modeling tool that allows the user to develop data-driven models of river basin systems. RiverWare was developed by the Center for Advanced Decision Support (CADSWES) at the University of Colorado and represents the state of the art in river basin modeling tools.
While our experience with other models is not as extensive, we have worked with MODSIM (a widely used simulation and optimization package for river basin network flow modeling) and have evaluated HEC-RAS, OPDM, Waters, IRAS, QUAL2E, SWMM, and BASINS. We have also created an irrigation development simulation model “IRRISIM” that includes river basin operation components including multiple reservoir operation, conjunctive use features and priority deliveries.
Operation Studies
Operation studies are conducted to determine the impact of irrigation system changes (additional acreage, improved efficiency, etc.), or development of new projects on the hydrologic system in which they operate. The studies utilize experience in on-farm irrigation system management and return flow analysis as well as river basin modeling expertise.
Hydrographic Surveys
Surveys are conducted within water basins to inventory manmade diversions and uses of water that alter the natural hydrology. Such hydrographic surveys are often components of water rights claims and appropriations. Hydrographic surveys are also used as input to river basin operations studies and simulations.
Instream Flow Studies
Analysis of river reaches to determine impact of flows on habitat for aquatic species are conducted. Both high flow impacts on development and maintenance of aquatic habitat features and base flow relationships between flow, wetted area and habitat are completed. Studies include both hydrologic and geomorphologic elements. Studies are developed in collaboration with aquatic biologists.