Future lake management requires detailed knowledge of the water balance of Lake Tana. Lake Tana sub basin Evaporation is one of the most important components of the water balance of Lakes all over the world. Comparisons between in-situ measurements and water volume variations estimated from using GRLM, RLH, Hydroweb and ICESat-GLAS water levels for Lake Tana. Lake Tana water shade has a drainage area of over 16,500km² (7). The 3000 km2 Lake Tana in the headwaters of the Blue Nile in Ethiopia is one of these lakes. (AESS Interdisciplinary Environmental Studies and Sciences Series). While the Chara Chara wier was constructed around 1995, at the mouth of the lake, to regulate its volume for downstream hydropower generation; the Tana Beles hydropower project was completed in 2010, and relies on water diverted from the lake through underground tunnels. In this thesis water balance terms are calculated on a daily base while simulated daily lake levels are compared to observed levels for the period 1995 to 2001. The fish resource potential of the Lake Tana itself is over 10,000 metric tons per year. of Lake Tana water balance is obtained by runoff from ungauged catchments that cover a large part of the Lake Tana basin. In addition to its ecological services, it serves for local transport, electric power generation, fishing, recreational purposes, and source of dry season irrigation water supply. The largest city on the lake shore, Bahir Dar, has a population of over 200,000, and at least 15,000 people are said to live on the islands in the lake. 2.3. Sample Size Determination According to United Nation Environmental Program (UNEP) Water Quality Monitoring, a practical guide to the In Stave K, Goshu G, Aynalem S, editors, Social and Ecological System Dynamics. Water Quality of Lake Tana Basin, Upper Blue Nile, Ethiopia: A Review of Available Data. Safeguarding these in a changing environment is a major challenge. Lakes hold most of the freshwater resources in the world. The city of Bahir Dar is situated on the southern shore of Lake Tana at latitude of 11035’N and longitude of 37023’E. Lake Tana is the largest fresh water body situated in the north‐western highlands of Ethiopia. 3 of 32.27 km3 at elevation 1787m (amsl), Maximum Surface area is 2900Km2 and Mean depth 8m (Daniel, 2007). The lake is also a natural reservoir for the eighty-megawatt runoff power station at Tis Abay. It is situated in a zone destined for rapid development including hydropower and irrigation. Fig.2. Springer. Lake Tana is the water body receiving most of the urban runoff and sanitary effluents drained from this city. 2017. p. 127-141. The water volume of Lake Tana is estimated to be 49.3 billion m 3. 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