Document Type

Conference Paper

Journal/Book Title/Conference

National Conference on Irrigation and Drainage Engineering


American Society of Civil Engineers

Publication Date


First Page


Last Page



Long-term water management planning models frequently use large time steps and must employ fairly crude assumptions (such as average climatic conditions, etc.). Managing stream aquifer systems during a dry season requires using finer discretization in time and space. Presented is a computer model, US/REMAX, developed by Utah State University personnel for aiding best management of stream-aquifer systems for both long and short eras. The model computes strategies for optimally allocating surface and ground water resources in time and space. For a water supply problem the model can maximize the sum of delivered surface and ground water. For an environmental protection problem the model can minimize total groundwater pumping (extraction plus injection) needed to capture contaminant plume. The model can provide optimal steady-state or time variant solutions. Weighting coefficients can be used in the objective function: (1) to emphasize substitution of surface water diversion for groundwater pumping or vice-versa, (2) or to achieve linear economic optimization.