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The problem of allocation of a limited water supply for irrigation of several crops grown in the same season is addressed. Both seasonal and intraseasonal competition for water between crops are considered. Since intraseasonal irrigation decisions are not independent, the allocation problem is solved in a dynamic framework by decomposition to two levels, seasonal and intraseasonal competition for water. A single crop irrigation scheduling model provides the input to the models at both levels. The optimization models at the two levels and the single crop model are solved by dynamic programming. Economic coefficients, crop areas, and crop growth stage stress effects are included in the mathematical formulation at both levels. The final output is an implementable set of weekly irrigation programmes of individual crops. Results of model application to a two crop situation are presented.

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