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Aqushela

Freshwater artificial lake in Ethiopia From Wikipedia, the free encyclopedia

Aqushela
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Aqushela is a typical over-dimensioned reservoir located in the Tanqwa-Abergele woreda of the Tigray Region in Ethiopia. The earthen dam that holds the reservoir was built in 1999 by the Relief Society of Tigray.[1]

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Dam characteristics

  • Dam height: 11.5 metres
  • Dam crest length: 456 metres
  • Spillway width: 16 metres

Capacity

  • Original capacity: 810,000 m3
  • Dead storage: 121,500 m3
  • Reservoir area: 20.5 ha

These are the design values. In practice, the runoff from the catchment is largely insufficient to fill the reservoir, which serves only as shallow drinking pond for livestock.[1]

Irrigation

  • Designed irrigated area: 50 ha
  • Actual irrigated area in 2002: 0 ha

Environment

The catchment of the reservoir is 13.5 km2 large. The lithology of the catchment is Precambrian metamorphic rock.[1] Land use is strongly dependent on lithology: soils on metamorphic black limestone are used for cropping, while those on the schist and slate formations are under savannah woodland. Lands on the green-reddish-gray metamorphic banded marl formation are used for settlements. Most common soil types are:[2]

  • in the metamorphic black limestone formation: Endoleptic Calcisol at the upper slope (plateau); Endoleptic Cambisol and Vertic Leptosol at the middle slope; Hypercalcic Calcisol at the footslopes and Grumic Vertisol at the lower slopes
  • in the schist and slate formations: Leptosol both at the upper slope and at the foot slope positions; Regosol (Calcaric) over Hypercalcic Calcisol at the mid slope position and Fluvisol at the valley bottom
  • in the green-reddish-gray metamorphosed banded marl: Leptic Calcisol at the upper slope, Haplic Calcisol at the foot slope, and Fluvisol at the valley bottom
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References

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