The view from a small corner of Anglesey...
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The Begasheka catchment is some 90 km west of Mekelle, 10km west of Adi Abi. It is an area where REST have conducted many activities, including building large water harvesting dams for irrigation.

The catchment is confusing and awkward to define from the ground, since it is made up a close series of hills a result of river erosion of a peniplain. There is no view point from which to get an overall view of the catchment.

Land use
The total area of the watershed is 1035 ha. Of the total watershed area, 52% is farmland the rest of the land is 29% area enclosure, 13% open grazing land and 13% homestead. There is extensive terracing throughout the area and some places are enclosed to prevent grazing.

Topography and Geology
The catchment is a high plateau surrounded by lower ground and within the catchment there are a close series of hills of similar height. The elevation of the watershed varies from 1750m at the outlet to 1891m at the upper most of the watershed. The underlying geology is a grey shaly metamorphosed limestone, perhaps turbidite, interbedded with sandstone; sands and gravels fill the valleys.

This watershed is classified as Dry Weina Dega agro climatic zone. According to the 5 years rainfall data measured at the nursery site in the watershed (Figure 10), the mean annual rainfall of the watershed is 741 mm. Similarly, the mean annual temperature and the mean annual potential evapo-transpiration are 22.90C and 1837mm respectively.

Monthly rainfall for the nursery raingauge in Begasheka

Hydrological features
There are many surface water features, dry gulleys cut through the river valleys and at the exit of the catchment there is permanent surface water which is used by the local population for drinking and washing. Numerous check dams have been constructed as well as water harvesting ponds in the largest tributaries. Groundwater is present in the valleys, 3-4 m below ground level, which is collected from hand dug wells, and sealed wells with India mark 2 handpumps donated by UNICEF.


Rainfall 2004-2005

The rainfall in Begasheka ranged from 680-700mm for the period June 2004 -Feb 2005. Farmers had been recording rainfall until the rains stopped in Nov 2004. Most of the rain fell in the 2 months July and August. An early rainfall event of 30mm caused a flood which demolished a water harvesting pond which had just been completed by REST.

Copyright © Martin Hollingham