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Transactions of the ASAE





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An interactive decision support program is presented for the rapid modification of optimal regional multiobjective groundwater planning strategies. This capability is important for water managers seeking to select the most satisfactory groundwater management strategies for their areas. The program guides decision maker(s) in refining numerically optimal regional strategies into strategies that may be socially or politically more acceptable. Strategy refinements are made by informed modification of constraining conditions on regional objectives or local variables. Application is illustrated by. modifying a bi criterion, sustained groundwater Withdrawal strategy for minimizing the cost of meeting regional water demand on the Arkansas Grand Prairie, an important irrigated area. The strategy was developed using a model in which the finite difference form of the two-dimensional groundwater flow equation is embedded in an optimization process. Results from the formal optimization process are submitted to the interactive program for evaluation and modification. This algorithm applies the constraint method and constrained derivatives to develop noninferior solutions and tradeoff functions and to determine the influence on the regional objectives caused by repeated changes in several local decision variables. Although its application is demonstrated with only a single optimization model. the interactive program can be utilized to modify optimal strategies resulting from other models as well.