Optimization of Surface Water Allocation in the Upper Ayeyarwady River Basin

Ei Ei Tun, Nilar Aye

Abstract


This study investigates the optimization of surface water allocation for hydropower irrigation and navigation sectors in the Upper Ayeyarwady River Basin. AQUARIUS (a modelling system for river basin development planning model) software is used. In this study, Kinda, Sedawgyi, Yeywa, Thaphanzeik, Zawgyi, Shweli, Dapein and Chibwenge hydropower plant are considered as demand sites for hydropower sector. Moreover, Kinda, Sedawgyi and Thaphanzeik irrigated areas are considered as demand sites for agricultural sector. The Ayeyarwady river and these above eight reservoirs are considered as supply sources. The required data for this study are collected from the department of meteorological, the electric power, agricultural and irrigation and inland water transport. Monthly discharges are collected from five stations. CROPWAT 8.0 model is used to calculate crop water requirement (ETc) and net irrigation water requirement (IWR). For computation of crop evapotranspiration (ETc), cropping pattern and crop data are required as input data into CROPWAT 8.0 and irrigation water requirement are calculated. Parameter relating water uses for reservoir, hydropower and irrigation water requirement in water system components are calculated. And then, the calculated irrigation water requirement, hydropower data, the reservoir data and economic data are inputted in AQUARIUS model. A flow network is created in the network worksheet screen (NWS) using AQUARIUS model. Flow network is used to determine water allocation for hydropower, irrigation and navigation in the Upper Ayeyarwady river basin. These reservoirs are supplied water to their respective hydropowers and irrigated areas. Based on the year 2014 water supply and demand condition, six future scenarios are simulated. According to model results, the overall allocated flows are about 90340 MCM and the values of State income are $11.42 million per year in the scenario 6.

As the main purpose of water allocation is balancing supply and demand and, promoting the efficient use of water, this scenario 6 should be selected for irrigation, navigation and hydropower sectors and for maximum State income of the Upper Ayeyarwady River Basin.


Keywords


AQUARIUS model; irrigation water requirement; water allocation; flow network; future scenario; State income.

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References


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