Abstract

The problem of water availability is an important issue in the development of a residential area, because the availability of water resources is the supporting capacity for the development of a residential area. Adequate water availability for now and predictions of future water availability are very important to know for ensuring an area that is feasible for development. The purpose of this study is to determine the amount of water availability through the method of calculating the water balance and calculating the mainstay discharge to find out whether the water needs are fulfilled or not. Household water consumption is one of the biggest contributors to the water crisis in residential areas. For this reason, it is necessary to have information that has high accuracy regarding the existence of water sources and the amount of water reserves owned by a location. The water balance is one way to determine the availability of water in an area so that it can be calculated whether the location will experience a water crisis or not. Calculation of water balance using the FJ Mock method can provide the information needed whether an area has a surplus of water or not and can be used to calculate the mainstay discharge which is useful for distributing water to residents. Making reservoirs or tendons is an alternative to overcome the occurrence of a water crisis when the dry season comes because often residential areas experience water shortage problems. For this reason, a calculation is made regarding the amount of water debit produced by the water reservoir made by the manager and the amount of surplus water is based on the monthly average method. The results of the calculation of the FJ Mock discharge can be seen that the resulting maximum discharge is 0.504 m³/second and the minimum discharge is 0.069 m³/sec. The results of the reliable discharge calculation show that the water discharge is still acceptable or meets the criteria because even though in August the water discharge that was achieved was only 0.069 m³/sec, this amount still meets the requirements at a reliability value of 99% and at an error value of 1%. These results provide evidence that the discharge generated by the two residential tendons of Taman Argo Subur still meets the requirements.