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Jatiluhur Estate is an area located in Purwakarta Regency and was developed for residential, industrial, and commercial areas. Therefore, it is important to determine the availability of water that will meet water needs, and to evaluate the water reliability in future. This study aimed to model the river discharge in determination of water availability of Jatiluhur Estate. The methods used in this study include observational discharge data, evapotranspiration, rainfall, and area of flow. To analyze the availability of water, F.J. Mock method was used, where the F.J. Mock method can show water balance analysis for monthly discharge. The results showed that the availability of water with mainstay discharge Q80% and Q90% met the water needs of the Jatiluhur Estate or showed a surplus condition for 30 years (2020-2050).

Abstract.The Indonesian Regulation which refers to the ICOLD Regulation (International Committee on Large Dam required have the Emergency Action Plan (EAP) guidelines because of the dams have potential failure. In EAP guidelines there is a management of evacuation where the determination of the inundation map based on flood modeling. The purpose of the EAP is to minimize the risk of loss of life and property in downstream which caused by dam failure. This paper will describe about develop flood modeling and inundation map in Krisak dam using numerical methods through dam break analysis (DBA) using hydraulic model Zhong Xing HY-21. The approaches of dam failure simulation are overtopping and piping. Overtopping simulation based on quadrangular, triangular and trapezium fracture. Piping simulation based on cracks of orifice. Using results of DBA, hazard classification of Krisak dam is very high. The nearest village affected dam failure is Singodutan village (distance is 1.45 kilometer from dam) with inundation depth is 1.85 meter. This result can be used by stakeholders such as emergency responders and the community at risk in formulating evacuation procedure.

In Purwakarta Regency there is a new area designated as a residential, commercial and industrial area, namely the Jatiluhur Estate Area. With the new area, it is necessary to know whether the availability of water can meet its water needs (water reliability) for the next 50 years. This research also carried out the water reliability mapping. Based on the analysis, both water availability with dependable discharge Q80% and Q90% overall and monthly, can fulfil the water needs of Jatiluhur Estate until 2070. However, with the regulation of water intake in the river, a ground tank is needed which takes into account the water loss of 19%, so that Q90% dependable discharge can fulfil the need while carrying out the regulation. From the results of monthly water reliability mapping, water reliability with Q80% and Q90% (overall) generate one color, four colors with Q80% (monthly), and three colors with Q90% (monthly). Whilst, the annual water reliability map generates one color for water reliability with Q80% and Q90% both overall and monthly.

This paper is a review of the development of simulation model for water-energy nexus in achieving sustainable water management in Indonesia. It is important to understand complex interconnection of water and energy to create strategy since Indonesia is facing the decrease of resources and increase of demand. A system dynamic simulation model is a reliable tool to simulate the relationship between water and energy. This study objective is to develop a conceptual model that can determine the amount of demand, supply, or import of water and energy. The method used is a Vensim (Ventana Simulation Environment) program. This conceptual water-energy nexus framework could further being tested to calculate the balance of water and energy element and creating sustainable resource management plans.