Addi Hilo

Addi Hilo
Addi Hilo
Coordinates	13.44277616°N 39.56654435°E / 13.44277616; 39.56654435
Type	Freshwater artificial lake
Basin countries	Ethiopia
Surface area	0.025 km^2 (0.0097 sq mi)
Water volume	0.108806×10^^6 m^3 (88.210 acre⋅ft)
Surface elevation	2,310 m (7,580 ft)
Settlements	Kwiha

Addi Hilo is a reservoir located in the Inderta woreda of the Tigray Region in Ethiopia. The earthen dam that holds the reservoir was built in 1998 by SAERT.^[1]

Dam characteristics

• Dam height: 11.4 metres
• Dam crest length: 171 metres
• Spillway width: 1 metre

Capacity

• Original capacity: 108 806 m³
• Dead storage: 4328 m³
• Reservoir area: 2.5 ha

In 2002, the life expectancy of the reservoir (the duration before it is filled with sediment) was estimated at 9 years.^[1]

Irrigation

• Designed irrigated area: 9 ha
• Actual irrigated area in 2002: 9 ha

Environment

The catchment of the reservoir is 0.72 km² large, with a perimeter of 3.34 km and a length of 1210 metres. The reservoir suffers from rapid siltation.^[2] The lithology of the catchment is dominantly Agula shale and little 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.^[3]

References

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. S2CID 129834993.
3. Nigussie Haregeweyn, and colleagues (2008). "Sediment yield variability in Northern Ethiopia: A quantitative analysis of its controlling factors". Catena. 75 (1): 65–76. Bibcode:2008Caten..75...65H. doi:10.1016/j.catena.2008.04.011.