An estimation model of farm field irrigation water demand is developed. The model is based on the lamped kinemtic wave model considering soil water balance. The lamped model approach reduces the computational load in rainfall-runoff analysis and allows application to large river basins. Evapotranspiration is estimated on hourly basis by the improvement of FAO's method. Not only water volume necessary for farm field irrigation but also the number of the water charge and its interval can be estimated by the combined use of the lamped runoff model and the hourly evapotranspiration model.
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