Open AccessAssessment of Water Balance at Mayang Watershed, East Java
Author(s) -
Ariska Mia Christiwarda Sihombing,
Indarto Indarto,
Sri Wahyuningsih
Publication year - 2021
Publication title -
geosfera indonesia
Language(s) - English
Resource type - Journals
eISSN - 2614-8528
pISSN - 2598-9723
DOI - 10.19184/geosi.v6i1.23111
Subject(s) - water balance , environmental science , wet season , watershed , dry season , water resource management , water supply , water resources , demand management , hydrology (agriculture) , geography , environmental engineering , engineering , ecology , economics , computer science , geotechnical engineering , cartography , machine learning , biology , macroeconomics
Mayang Watersheds frequently hit by floods during the rainy season and drought during the dry season. This study aims to assess the water balance by calculating water resource availability and water demand in the Mayang watershed. The Water Evaluation and Planning (WEAP) model was used as the primary tool for the analysis. The supply of water comes only from precipitation. Demand was calculated based on the water demand for irrigation, domestic, urban, industrial, and livestock uses. The unit of time to calculate the water balance is ten days. It means that each month is divided into three-time steps. Analysis of the WEAP is based on the water demand from 2002 to 2019. The results showed that from 3rd December to 1st May, the Mayang river and its tributaries could supply all demand sites up to 100%. However, unmet demand occurs from 2nd May to 2nd December. The highest first unmet demand occurred in October, with 0.67 million m3. The management of water resources, especially in terms of distribution during the rainy season and dry season, must be considered.
Keywords: Water balance; Water supply; Water demand; Mayang; Watershed; WEAP
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