Seite - 437 - in Book of Full Papers - Symposium Hydro Engineering

review (5). The result of the review is compared with the periodical data of the dam’s operation throughout the last 20 years and the regulation on Indonesian dam management [6]. Fig. 1 Dams in comparison: Wadaslintang (left) and Sempor (right) 2. NEXUS CONCEPTS AND METHODS 3.1. NEXUS CONCEPTS From the literature review in finding the balance of sedimentation, water conservation, and energy: the Nexus approach came as the highlight. This review is then followed up by a historical review of the approach. The Nexus approach 1st was launched at the 2011 Bonn Conference (6), which addresses the theme of “The Water, Energy, and Food Security (WEF) Nexus – Solutions for the Green Economy.” However, the need for ‘nexus’ has been identified in 2008 at the World Economic Forum annual meeting (7). This approach has been developed since then through serious attempts to make it a simplified tool. A literature review done by Bassel and Mohtar (2015) identified four main tools used commonly in to address the WEF nexus: WEAP (SEI, 2014), LEAP (SEI, 2013), MuSIASEM (FAO, 2013), and CLEWS (KTH, 2013). Out of which, this paper uses the simplified models of CLEWS and WEAP-LEAP to define the balance of dam management. This paper uses the following data as input: technical data of the reservoir: water for conservation (volume), water balance (discharge versus outcome), and sedimentation (upstream land use, sedimentation rate), while the outputs are categorized as: (1) water: drinking water need (2) energy: energy production, water for energy generation need (3) food: irrigated land, food production, irrigation water need 3.2. METHODS The methods in defining the balance of the input and output for the tool will be presented by percentage. If the water percentage for the input lower than the output, it shows that the water storage capacity of the dam should be on function, 437