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Table 4 compares the recommended drilling depths from the GWA model with the actual drilling depths achieved in phase 3 of the test drilling.

Table 4

Recommended drilling depths from GWA model

 Location
DescriptionDobe 1Dobe 2Suula 1
Recommended water strike depth (from GWA) 110 m a.s.l. 110 m a.s.l. 88 m a.s.l. 
Actual water level after drilling 113 m a.s.l. 116 m a.s.l. 98 m a.s.l. 
Recommended water quality (from GWA) 1,900 μS/cm 1,800 μS/cm 1,000 μS/cm 
Actual water quality (after drilling) 7,000 μS/cm 3,000 μS/cm 1,900 μS/cm 
SWL (m b.g.l) 2.5 207 
DD (m b.g.l)   112.4 
DWL (m b.g.l)   219.4 
Yield (L/s) 10 3.9 
Water quality Not acceptable Acceptable Acceptable 
Aquifer type Alluvial deposit Alluvial deposit Fractured basalt and scoria 
Remark Compressor test Compressor test Test pumping undertaken 
 Location
DescriptionDobe 1Dobe 2Suula 1
Recommended water strike depth (from GWA) 110 m a.s.l. 110 m a.s.l. 88 m a.s.l. 
Actual water level after drilling 113 m a.s.l. 116 m a.s.l. 98 m a.s.l. 
Recommended water quality (from GWA) 1,900 μS/cm 1,800 μS/cm 1,000 μS/cm 
Actual water quality (after drilling) 7,000 μS/cm 3,000 μS/cm 1,900 μS/cm 
SWL (m b.g.l) 2.5 207 
DD (m b.g.l)   112.4 
DWL (m b.g.l)   219.4 
Yield (L/s) 10 3.9 
Water quality Not acceptable Acceptable Acceptable 
Aquifer type Alluvial deposit Alluvial deposit Fractured basalt and scoria 
Remark Compressor test Compressor test Test pumping undertaken 

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