Dynamics System Model for the Optimization of Irrigation Water Allocation

Abstract

This paper intends to build the optimization of irrigation water allocation. The research method uses a dynamics system that the methodology consists of building the causal loop diagram that amplifies (positive feedback loop) or negates (negative feedback loop) for a change in a system variable. Water balance is an important aspect of using the water resources. Its existence can provide an overview of the balance sheet conditions between water availability and water needs over a specific period. The water balance sheet can show the status of water availability conditions, whether the status is already in deficit or still excessive. Irrigation as part of water resource management is a system in society that is dynamic and depends on the environmental conditions, mainly because of the variety of actors, the variety of uses, across the different administrative areas and different cultures. This condition is further aggravated by the reduction in water sources that can be used as the main source of irrigation due to climate change, changes in land use and other uses such as domestic needs. Therefore, the complexity and limitations of the water resource are a challenge for irrigation development now and in the future. This research intends to optimize the irrigation water allocation by suing the dynamics system. By analyzing the causal relationships that affect the water availability, causal relationships that affect water demand, and formulating interventions with high leverage, the optimal condition is found. The results show that the limited amount of water availability with the increasing number of waters needs for various uses requires arranging the optimal water allocation in a fair, efficient and environmentally sound sense. However, the use of water for irrigation that can be allocated to fisheries will obtain maximum economic benefits if fisheries get top priority in water allocation.