Chini is a small

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

located in Melfa (

Dogu’a Tembien Dogu'a Tembien (, "Upper Tembien", sometimes transliterated as Degua Tembien or Dägʿa Tämben) is a districts of Ethiopia, woreda in Tigray Region, Ethiopia. It is named in part after the former province of Tembien Province, Tembien. Nowadays, ...

''woreda'',

Tigray Region The Tigray Region (or simply Tigray; officially the Tigray National Regional State) is the northernmost Regions of Ethiopia, regional state in Ethiopia. The Tigray Region is the homeland of the Tigrayan, Irob people, Irob and Kunama people. I ...

Ethiopia Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...

). The 151-metres long

earthen dam An embankment dam is a large artificial dam. It is typically created by the placement and compaction of a complex semi-plastic mound of various compositions of soil or rock. It has a semi-pervious waterproof natural covering for its surface ...

that holds the reservoir was built in 1993 by the

Relief Society of Tigray The Relief Society of Tigray (abbreviated REST; or ማረት, ''Maret'') is an NGO based in Tigray Region, Tigray, northern Ethiopia. REST was founded in 1978 as an organisation providing relief (humanitarian), relief efforts to civilians. As ...

. It was mainly constructed for purpose of livestock watering. The

catchment A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, th ...

of the reservoir is 1.86 km² large, with a perimeter of 5.15 km and a length of 1800 metres. The reservoir suffers from rapid

siltation Siltation is water pollution caused by particulate terrestrial clastic material, with a particle size dominated by silt or clay. It refers both to the increased concentration of suspended sediments and to the increased accumulation (temporary o ...

. The lithology of the catchment is composed of

Ashangi Basalts The Ashangi Basalts are the earliest Tertiary volcanic rocks in north Ethiopia, hence they are in the lowest position. These dark porphyritic basalts are separated from the Mesozoic formations below it by basal conglomerates. The basalts hold phe ...

. Part of the water that could be used for irrigation is lost through

seepage In soil mechanics, seepage is the movement of water through soil. If fluid pressures in a soil deposit are uniformly increasing with depth according to u = \rho_w g z_w, where z_w is the depth below the water table, then hydrostatic conditions wi ...

; the positive side-effect is that this contributes to

groundwater recharge Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in ...

. Actually, in the wider surrounding of the reservoir, both upstream and downstream the level of the watertable has strongly raised, and the area has become remarkably greener.

References

{{reflist Reservoirs in Ethiopia 1993 establishments in Ethiopia Tigray Region Dogu'a Tembien