Analisis tingkat keandalan Bendungan Bendo Ponorogo

Abstract

Population growth which increases every year affects water demand, resulting in an imbalance between water availability and water demand. With the construction of the Bendo Dam, it is hoped that it will be able to accommodate river flow and rainwater that falls on the dam so that it can be used to meet the irrigation water needs of rice fields and the community's raw water needs throughout the year.This calculation includes hydrological analysis, dam characteristics analysis, water availability analysis using the F.J. Mock, water demand analysis and reliability analysis. Dam reliability analysis is obtained from water balance simulations and the dam's level of reliability to serve the community's water needs.The dam storage capacity is 43,114,234.00 m3 with live storage of 33,938,148.00 m3 and dead storage of 9,176,086.00 m3.The level of reliability of the Bendo Dam to meet raw water needs with 10 years projection until 2031 and irrigation water needs with a rice field area of 3299 ha obtained an average level of reliability of 26.69%.. The average level of reliability is still very low, only part of it can be served, so optimization needs to be done to get a reliability level of 100%. The optimization level of reliability is obtained if the water requirement is only to serve the projected raw water needs for 2031 with a population of 230,154 people in 3 sub-districts (namely Sawoo Subdistrict, Mlarak Subdistrict, and Badegan Subdistrict), and serving irrigation needs with a rice field area of 600 ha