ANALYSIS OF SURFACE WATER RESOURCES CARRYING CAPACITY WITH SPATIAL APPROACH (CASE STUDY : CITARUM UPSTREAM WATERSHED)

• Main Author: Puspa Eskawiyanti, Antari
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/66197
• Institution: Institut Teknologi Bandung

Determining the carrying capacity, especially the water carrying capacity of an area, is one approach in evaluating the use of regional space. Water carrying capacity is the ability of water resources to meet a need by reviewing the amount of water availability. The carrying capacity of water is calculated based on the calculation of water demand and water availability. The two variables are compared so that it can be seen that the available water can be sufficient for various needs. The upstream part of the Citarum watershed is a basin surrounded by the Tangkubanparahu Mountains complex in the north, the Patuha-Malabar mountain complex in the south, and the Krenceng Mountains and Mandalawangi Mountains in the south. The areas traversed by the Upper Citarum sub-watershed include Sumedang Regency, Bandung Regency, Bandung City and Cimahi City. To prevent problems that will arise due to limited water resources, it is necessary to carry out water resource management activities in an integrative, efficient manner, and strive for sustainable water use. The analysis was carried out in the Upper Citarum watershed using the integration of the SWAT hydroeconomic model and DSS-WEAP (Soil Water Assessment Tool and Water Evaluation and Planning) supported by arcGIS software. Based on the results of the SWAT model, the total water demand in the Upper Citarum watershed in 2020 for domestic, non-domestic, irrigation, respectively, is 35,273 m3/second, 2,085 m3/second, 20,776 m3/second. Meanwhile, the average environmental water demand is 3.34 m3/second. Meanwhile, the total water demand in the Upper Citarum Watershed in 2040 for domestic, non-domestic and irrigation are 38,902 m3/second, 2,516 m3/second, 54.57 m3/second. Meanwhile, the average environmental water requirement is 1.17 m3/second. WEAP operates on the basic principle of water balance and can be applied to urban or agricultural systems, single watersheds or cross-regional watersheds. The model simulation produces a deficit value in August with a total unmet demand of 18.82 m3/second or an average unmet demand in 2018 of 1,381 m3/second. From the simulation results, it is found that the best scenario to increase the carrying capacity of the Upper Citarum Watershed in order to meet the needs of the Regency and City of Bandung, Sumedang Regency and Cimahi City in the form of irrigation efficiency, Demand Save Management and domestic because it can reduce the overall value of unmet demand in 2040, which is 90.15% of the reference scenario. Thus, by implementing the management of domestic water needs, irrigation and fisheries with due observance of spatial conditions can be optimized to reduce the large water demand and therefore will make this scenario more effective in reducing water shortages for both domestic and irrigation in the upstream watershed.