Having and drilling a borehole is an asset that should last you at least 10 to 15 years at a very little ongoing cost, provided you do everything correctly at the start!
Nakiso Borehole Drilling has prepared a checklist to assist you when it comes to drilling a borehole in Zimbabwe. This includes your buying decision. One that should be based on ‘value’ and not on ‘price’ alone.
Location of Water:
3. Check if the person you hired to site the borehole uses more than one method of cross-checking.
Choice of Borehole Driller:1. Check references of previous clients who have had time to assess the quality of work over a reasonable period of time.
5. Check on the diameter of the borehole to be drilled. A diameter of 152 mm (6 inches / 216 mm (8 inches), is recommended for a domestic borehole.
6. Check if equipment can reach target depth.
7. Check if the company does borehole development and how the company will improve water yield if necessary – if he/she does not understand the meaning of borehole development, get another driller.
9. Check that the company will be able to continue drilling when hitting intersecting clay, unconsolidated sand or hard rock.
10. Check that the company will provide samples of the material of each and every metre drilled.
12. Check if the company provides records of work carried out, e.g. siter's report, driller’s report etc. When selling property, remember a borehole represents a substantial capital investment.
13. Check that the driller provides a record of exact depth at which the most promising water fissure is located. This information is vital to the pump installer to enable the company to select the correct pump for your needs.
14. Check if the company has a standard form of contract or terms. Of vital importance to both parties.
Other factors that need to be taken heed of by you, the end-user:
- A modern drilling rig is large and heavy – in urban areas it can cause a certain amount of unavoidable damage, and the contractor cannot reasonably be held responsible.
- Drilling rigs are noisy and they generally make a great deal of mess, both these factors are unavoidable. In urban areas, neighbours should be warned that drilling will be taking place on your property.
- Ensure that there are no electrical cables, sewage or water pipes hidden under the ground where the drilling will take place.
- There are many unknowns, such as final depth, the amount required and time taken for development, so you need to agree on a suitable amount to be allowed for ‘add-ons’ with your contractor.
- Drillers levy a surcharge for drilling through very hard rocks, e.g. dolomite formation requires specialized expertise to drill into.