Procedure for borehole drilling:
- Conduct a hydro geological survey. This is done before borehole drilling has commenced. The survey can be done by the following parties;
- Licensed private hydro geologist
- Water resource management authority
The hydro geological survey report is based on the findings observed while carrying out survey, it contains the following:
- Recommended depth
- exact point of drilling
- Location map sheet, elevation and coordinates hydro geological and geophysics of the area
2. Application for authorization to drill (Permit). Obtained from water resources management authority through their regional offices. E.g. for Kisumu and environs, the office is Athi Water Catchment in Kisumu town. Lake Victoria North Water Service Board or Lake Victoria South Water Board.
All the above can be facilitated by the drilling contractor.
The borehole is drilled with 8” drill bit and 6” casing installed thereafter up to the bottom. Gravel pack is then fitted between the casing and the borehole wall. This filters water from the rocks. Borehole development follows after gravel packing which flushes out any hidden silts from the screens until the water is sediment-free and clear. Test pumping follows. Water is pumped out of the borehole for 24 continuous hours to expose the borehole to the extremes of pumping. Recovery measurements are then done for six hours Various important borehole data is collected. Samples of water are collected and taken to a government chemist for analysis, for both bacteriological and chemical analysis.
4. Equipping: Borehole equipping is then carried out where the pump is installed with all the accompanying accessories.
Borehole equipping costs are determined after test pumping is done. This is because the pump has to be sized using the test pumping data obtained and the customer requirements. In case you have any questions, don’t hesitate to contact us. We hope the above is in order whilst we await receipt of valued order