ANALYSIS OF THE DROUGHT DISTRIBUTION OF THE PALMER DROUGHT SEVERITY INDEX (PDSI) METHOD IN THE IRRIGATION JURANG SATE ON LOMBOK RIVER BASIN

Abstract

The problem of drought during the long dry season becomes routine in Indonesia, but the handling of prevention and prevention is very slow so that it becomes a prolonged problem that is not resolved. Drought has a relationship with the balance between demand and water supply for various purposes. Irrigation area (DI) Jurang Sate is divided into two, namely: In the Upper Sate Jurang (4095 Ha) and Downstream Jurang Sate (6383 Ha). The availability of water in the Jurang Sate Irrigation Area (DI) can be obtained from Jangkok Weir, Sesaot Feeder Weir, Keru Feeder Weir, Jurang Sate Weir. The analysis conducted was: i) Thiessen Polygon Analysis, ii) Analysis of Regional Rainfall, iii) Analysis of Area Evaporation, and iv) Analysis of Drought in the PDSI Method. Based on the drought analysis, it was found that the drought index value in the Irrigation Area (DI) The satay gap occurred in August to October which needed further water regulation because the Jurang Sate Irrigation Area (DI) had water coming from water structures in the form of weirs namely Jangkok weir, Sesaot feeder Weir, Keru Feeder Weir and Jurang Sate Weir.