Assessing Agricultural Water Reliability in Jetis Irrigation Area Using the F.J. Mock Hydrological Model

Abstract

Jetis Irrigation area is located in Sidohardjo Subdistrict, Sragen Regency, Central Java, and is known for its rice crop production. This study aimed to assess water availability, estimate water requirements, and analyze irrigation expansion in the area. Data on discharge, evapotranspiration, rainfall, and flow area were collected and analyzed using the F.J. Mock method. This method enabled monthly calculations of water balance analysis and discharge rates. The study found that the availability of water at Q80% and Q90% discharge rates was sufficient to meet the water needs of the Jetis irrigation area. By assessing agricultural water reliability, policymakers can incorporate these findings into land-use planning and water allocation decisions.