GUIDANCE AND EVALUATION OF IRRIGATION WATER AVAILABILITY IN THE KAROMAH FARMERS GROUP AREA, SUMBER ANYAR VILLAGE, MLANDINGAN DISTRICT, SITUBONDO SUBDISTRICT

Abstract

Limited irrigation water availability is one of the main factors contributing to the low Cropping Index (CI) in non-technical irrigated and rainfed paddy fields, particularly in areas with inadequate irrigation infrastructure. The Karomah Farmer Group in Sumberanyar Village, Mlandingan District, Situbondo Regency represents a potentially productive agricultural area facing similar challenges due to damaged irrigation networks and changes in river morphology following flood events. This community service activity aims to evaluate the balance between irrigation water demand and availability and to formulate appropriate irrigation infrastructure recommendations through a participatory approach. The method applied was a Survey, Investigation, and Design (SID), involving the collection of primary data through field observations, farmer group interviews, and surveys of existing conditions, as well as secondary data from climatological records. Water availability analysis was conducted using the F.J. Mock method to determine dependable discharge, while irrigation water demand was calculated using the Net Field Requirement (NFR) method. The results indicate a significant imbalance between water availability and demand during the dry season, which adversely affects the (CI). Based on topographic conditions and the potential risk of flash floods, the proposed infrastructure recommendation is the construction of a storage tank or infiltration control basin as an adaptive and safe solution. Participatory assistance and design are expected to support agricultural land optimization, increase the (CI), and ensure the sustainability of water resources management in the Karomah Farmer Group area.