Our approach involves quantitative and qualitative elements of conjunctive use programs.   Multivariate statistical techniques are used to establish the parameters critical to available surface water and groundwater flow volumes.  The results are applied to a water balance model of aquifers and rivers located in regions of high agricultural and municipal water demands along the Rio Grande/Río Bravo.  The model’s basis is focused simplicity of critical parameters.  This methodology allows flexibility and use of the model in other semiarid regions.  Water balance scenarios are tested via optimization and economic analysis using marginal values of optimal water flows and associated costs.

Qualitative factors are also crucial to viable water management policy.  A parametric and non-parametric survey of active conjunctive programs in semiarid regions allows realistic evaluation of the multivariate statistic and water balance model results.  Combining the qualitative and quantitative results will provide standards for conjunctive management planning.

Outcome of the research will provide key parameters and limits for conjunctive management, particularly when structured in a manner useful for water policy decisions.  Rather than spend funds on general planning, this approach will encourage focused, limited economics to realize the goal of water conservation and savings.