Evaluation of the Kampili Weir Operations for Irrigation using Hec-ResSim Mahmud Achmad (a*), Samsuar (a), Ahmad Munir (a), and Wahyuni (a)
(a) Department of Agricultural Technology, Universitas Hasanuddin
* m.achmad1970[at]gmail.com
Abstract
Dam authority has managed Kampili weir to irrigate around 4000 ha rice field since 2004. Farmers were frequently complaint the lacking of water during dry season, so it is necessary to evaluate water allocation for irrigation area. One of hydrological reservoir simulation models that can be used for reservoir operations is the HEC-ResSim model. This study aims to review 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. Simulation was carried out to compute the availability of water during using the operating allocation pattern and water needs of paddy filed in 2018. It was found that rice field need irrigation in the period of April till October. HEC-ResSim was able to simulate 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. During minimum capacity of the weir, it can only supply the irrigation water needs was about 72%. This proves that the weir could not provide total water needs for farmers in Kampili irrigation scheme throughout the year.
