Potential Water Resources Carrying Capacity based on Analysis of Irrigation Water Supply and Demand in the Cihea Cisokan irrigation area Cianjur Regency
Land use change that occurs in the upstream of the Cisokan watershed causes the value of water availability to be disrupted. The result of land conversion is a high erosion rate and a high sedimentation rate, which
affects the availability of water entering the Cisokan primary network in the Cihea Irrigation Area. This study aims to determine the status of water carrying capacity based on a comparison of water demand and availability in the Cihea Irrigation Area. The method used to determine water supply is the reliable discharge method with Weibull probability and water demand is analyzed using the KP-01 approach. The Thiessen Polygon method is used to determine regional rainfall and the Thornthwaite-Mather method is used in climate data analysis to determine the actual evapotranspiration value. Water demand is also influenced by the cropping pattern system used, the cropping pattern used in the Cihea Irrigation Area is Rice-Rice-Secondary foodcrop. The results of the study show that the value of the water balance in the Cihea Irrigation Area in 2023 is a surplus with a total water availability of 139,624,992 m3/year and a water demand of 121,565,295 m3/year. The value of the water balance experienced a deficit from August to October. This was due to the dry season from August to October.