Geology and Site Selection


Target audience

Drilling teams and other experts involved in the drilling and site selection of boreholes and wells.
Fieldworkers of NGO's involved in monitoring drilling and well digging.

Summary

The construction of a borehole, using manual drilling techniques is a complicated process. Before drilling starts, a good drilling site has to be selected where there will be an adequate quantity and a good quality of ground water.

During the drilling process there are a lot of different aspects which require attention to make sure nothing is going wrong. Besides the practical drilling skills which are executed at ground level, attention has to be paid to important processes which are happening below ground level during drilling. Water used in drilling could flow away or worse, the borehole could collapse resulting in buried drilling equipment.

In many countries manual drilling teams experience problems with site selection, loss of working water, soil determination, well installation, well development, water quality and flow rate of the well. These problems may occur when the site-, well- and/or pump selection is not completely understood and important steps are missed.

We recommend a manual of Foundation Practica. This manual will help you to understand the drilling process at ground level and far below ground level and can therefore be used as a preparation before the actual drilling or digging. This manual is made out of three important issues before you can start drilling or digging for water:

• What is the best place for having a borehole or well?
• What is the best possibility to reach water: drilling or digging?
• What type of rope pump could be installed: the Rope pump A-model or the Rope pump Windlass-model?

You can find this manual at: http://www.practicafoundation.nl/services/publications/manuals/.

Date

April 2009