TINJAUAN POTENSI TEKNIS DAN KELAYAKAN EKONOMI PLTA PADA PROYEK KERJA SAMA PEMERINTAH DENGAN BADAN USAHA BENDUNGAN MERANGIN

One of the utilizations of a multipurpose dam that has socio-economic value during its operation iselectricity generation. The addition of a hydropower component to a PPP project is quite a challenge due to substantial uncertainty related to hydrological aspects that will impact electricity production and revenue, as well as high initial investment costs for generating units. This study aims to map the technical potential of hydropower and evaluate the economic feasibility of hydropower in the Merangin Dam PPP Project. The potential for power and energy generation is obtained through simulations of the hydropower operation for 19 years using hydrological data, HEC-HMS model generated-data, and dam engineering design. According to the results, the technical potential of hydropower can produce, on average, power of Pp = 103.8 MW during peak load, Pb = 98.53 MW during base load, and total energy of 636.66 GWh/year. The economic potential is evaluated through social cost-benefits analysis (SCBA) by estimating the additional benefits obtained from the hydropower compared to the PPP structure of the Merangin Dam without hydropower. Through SCBA, the addition of hydropower to the Merangin Dam PPP structure has an EIRR value of 35.24%, NPV of Rp. 2.104.212.122.723,- and BCR = 3.06. Based on these indicators, the provision of hydropower plants is considered economically feasible because the benefits that will be generated and obtained by the community are higher than the economic costs incurred.Keywords: Technical potential, economic feasibility, hydropower plant, multipurpose dam, PPP

Reservoir Sediment Management Practices in Sudan: A Case Study of Khashm El-Girba Dam

The sedimentation problem is a hot issue currently affecting the operations of reservoirs and irrigation networks in Sudan. Most of the rivers that cross Sudanese borders come from the Eastern African Plateau, which acts as a sediment source for the Nile River and its tributaries. Khashm el-Girba Dam (KEGD), which crosses the Atbara River in Eastern Sudan, is a multipurpose dam that was constructed in 1964. The Atbara River is a branch of the Nile River system, and the river carries a large amount of sediment during the flood period. Seven years after construction, in 1970, the dam faced a critical problem that could have led to a disaster; it was discovered that, due to sediment deposition, the water storage was not enough to satisfy the downstream requirements. This study discusses the sediment management practices used in KEGD and their impacts on maintaining the reservoir capacity. Practices including operation policy (OP), trap efficiency (TE), sluicing, sediment sluicing, and flushing operation (FO) were discussed. The adopted management practices succeeded in removing a considerable amount of silt and maintaining the lifetime of the reservoir.

Pemanfaatan Waduk Gajah Mungkur untuk Meningkatkan Pertumbuhan Ekonomi Masyarakat Kabupaten Wonogiri

One of the famous icons of the Wonogiri Regency is a multipurpose dam called the Gajah Mungkur Reservoir and its existence until now has been a driving wheel for the economy, the benefits of which have already been felt by the people around Wonogiri Regency. Writing this article aims to explain the various forms of utilization of the existence of the reservoir and its impact on the economy of Wonogiri Regency. The research method used is descriptive qualitative with a literature study which contains various economic activities that have been running in Wonogiri Regency by utilizing the Gajah Mungkur Reservoir. The results of this study indicate that reservoir construction has succeeded in increasing the economy of Wonogiri Regency. This can be seen from various sectors such as increased agricultural output of the Wonogiri community due to the existence of good irrigation facilities, the development of inland aquaculture, and the advancement of the tourism sector. Basically, research on the use of the Gajah Mungkur Reservoir has proven to be a solution in helping to create a more developed and prosperous economy of the Wonogiri Regency community.

Dam Inflow Prediction by using Artificial Neural Network Reservoir Computing

A multipurpose dam serves multiple modalities like agriculture, hydropower, industry, daily usage. Generally dam water level and inflow are changing throughout the year. So, multipurpose dams require effective water management strategies in place for efficient utilization of water. Discrepancy in water management may lead to significant socio-economic losses and may have effect on agriculture patterns in surrounding areas. Inflow is one of the dynamic driving factors in water management. So accurate inflow forecasting is necessary for effective water management. For inflow forecasting various methods are used by researchers. Among them Auto Regressive Integrated Moving Average (ARIMA) and Artificial Neural Network (ANN) techniques are most popular. Both of these techniques have shown significant contribution in various domains in regards to forecasting. But they have a common drawback in handling non-stationary inflow patterns. To address this drawback, in this work neural Reservoir Computing technique is used. In this work, Context reverberation network, also known as reservoir computing approach, is applied for inflow forecasting. It comprises of a dynamic neural reservoir. As the nature of a neural reservoir is dynamic, it can easily model complex nonstationary patterns along with stationary ones. Proposed model is applied on daily inflow data of Srisailam Dam which is a multipurpose dam. Here ARIMA and ANN models are compared with Reservoir Computing model. On various evaluation parameters Reservoir computing is proved better than ARIMA and ANN.