Analisis Pengaruh Debit Air Rancangan Terhadap Dimensi Saluran Berdasarkan Neraca Air DAS Lesti

This research focuses on several main analyses starting with rainfall analysis in the Lesti River watershed. The study location is near Sengguruh Dam, located near Kepanjen, where the mouth of Lesti River itself, which is a tributary of Brantas River, also flows toward Sengguruh Dam. The observation point is located in Cempokomulyo area in Kepanjen, which is passed by Lesti River. The calculation and analysis process is expected to provide several solutions that can help in the planning process, considering that recent periods in Kepanjen area have experienced water flooding at several rain moments. Therefore, this research is directed to analyze flood discharge up to channel dimensions, specifically in the Cempokomulyo area. The expectation from this research results is to provide an overview of channel conditions during the 2022 rainy season, especially if it can provide an overview of several calculation results obtained in the analysis process. In this research process, several methods were used in the calculation process such as Polygon Theissen, Gamma 1, and Log Person III. The results of this calculation process found that several channels have experienced overflow because the water discharge contained is greater than the capacity that can be accommodated by the channel.