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Evaluation of the Kampili weir operations for irrigation using HEC-ResSim
Achmad M.
Aip Conference Proceedings
Abstract
Dam authority has managed the Kampili weir to irrigate around 4000 ha rice fields since 2004. Farmers frequently complain about the lack of water during the dry season, so it is necessary to evaluate water allocation for irrigation areas. One of the hydrological reservoir simulation models that can be used for reservoir operations is the HEC-ResSim model. This study aims to review the annual water management of the Kampili weir for irrigation using HEC-ResSim software. The evaluation was done by determining and comparing the water availability in dams and irrigation water needs. The simulation was carried out to compute water availability using the operating allocation pattern and water needs of paddy filed in 2018. It was found that rice fields need irrigation in the period of April till October. HEC-ResSim simulated water availability with the highest value in the first 15 days was 25.10 mm/day, and the highest water demand is in the last 15 days of September, with 15.82 mm/day. The minimum capacity of the weir, which can supply the irrigation water needs was about 72%. It means that the weir could not provide total water needs for farmers in the Kampili irrigation scheme.