Design procedures and concepts of optimization for an earth dam is investigated and a practical numerical method is suggested. The numerical problem is produced based on constrained nonlinear optimization formulation, in which variables are effective parameters required to specify dam. The goal function usually is constructed based on the price of materials and cost of contraction and constrains are some code requirements for material and geometry to reach a safe and economical structure and/or specify some limits to variables. Based on designer experience a conceptual model is defined. Polynomial functions are used in the mathematical model for estimating dam responses. These functions are constructed from results of analyzing a few number of selected dams. Nonlinear regression is used to calculate their coefficients. This mathematical model is optimized and an approximate optimum design attained. Accuracy is examined by analysis and comparison of results with approximate results obtained from mathematical model.
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