Gereb Bi'ati

Gereb Bi’ati
Gereb Bi’ati
	Gereb Bi’ati
Coordinates	13.44277614°N 39.4747198°E
Type	Freshwater artificial lake
Basin countries	Ethiopia
Surface area	0.17 km2 (0.066 sq mi)
Water volume	1.005841×106 m3 (815.449 acre⋅ft)
Surface elevation	2,140 m (7,020 ft)
Settlements	Mekelle

Gereb Bi’ati is a reservoir located near Mekelle in the Tigray Region in Ethiopia. The earthen dam that holds the reservoir was built in 2000 by SAERT.[1]

Dam characteristics

Dam height: 17 metres
Dam crest length: 578 metres
Spillway width: 40 metres

Capacity

Original capacity: 1005841 m³
Dead storage: 232728 m³
Reservoir area: 17 ha
Designed irrigated area: 88 ha

Environment

The catchment of the reservoir is 9.71 km² large, with a perimeter of 14.24 km and a length of 4960 metres. Due to the possibility to by-pass sediment-laden water, the reservoir suffers from less rapid siltation.[2][3] The lithology of the catchment is Agula Shale and Mekelle Dolerite.[1] Part of the water that could be used for irrigation is lost through seepage; the positive side-effect is that this contributes to groundwater recharge.[4]

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References

De Wit, Joke (2003). Stuwmeren in Tigray (Noord-Ethiopië): kenmerken, sedimentatie en sediment-bronnen. Unpub. M.Sc. thesis. Department of Geography, K.U.Leuven.
Nigussie Haregeweyn, and colleagues (2006). "Reservoirs in Tigray: characteristics and sediment deposition problems". Land Degradation and Development. 17: 211–230. doi:10.1002/ldr.698.
Vanmaercke, M. and colleagues (2019). Sediment Yield and Reservoir Siltation in Tigray. Cham (CH): Springer Nature. pp. 345–357.
Nigussie Haregeweyn, and colleagues (2008). "Sediment yield variability in Northern Ethiopia: A quantitative analysis of its controlling factors". Catena. 75: 65–76. doi:10.1016/j.catena.2008.04.011.

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[joke-1] De Wit, Joke (2003). Stuwmeren in Tigray (Noord-Ethiopië): kenmerken, sedimentatie en sediment-bronnen. Unpub. M.Sc. thesis. Department of Geography, K.U.Leuven.

[2] Nigussie Haregeweyn, and colleagues (2006). "Reservoirs in Tigray: characteristics and sediment deposition problems". Land Degradation and Development. 17: 211–230. doi:10.1002/ldr.698.

[3] Vanmaercke, M. and colleagues (2019). Sediment Yield and Reservoir Siltation in Tigray. Cham (CH): Springer Nature. pp. 345–357.

[4] Nigussie Haregeweyn, and colleagues (2008). "Sediment yield variability in Northern Ethiopia: A quantitative analysis of its controlling factors". Catena. 75: 65–76. doi:10.1016/j.catena.2008.04.011.