ABSTRACT
Modelling and analysis methods for evaluating the water supply capabilities of reservoir/river systems are fundamental to the effective management of the highly variable water resources of a river basin. Recently mathematic programming based on genetic algorithms has been developed. Genetic algorithms are optimising algorithms, inspired by natural evolution. The genetic algorithms model gives better results when compared to the linear programming model on reservoir operation for known total irrigation demand and on the optimal allocation of water available to crops at the farm level. In this chapter, the simulations have been conducted based on the diversion by the weirs in the Yeh Ho River and on the storage in Telaga Tunjung Reservoir to supply the Subak irrigation schemes with the required amounts of irrigation water in a timely and efficient manner, based on the cropping patterns. The physical characteristics of the Subak irrigation schemes and their operation rules can be modified to adapt to the changing circumstances.
