Hello client, as you read this write up, please follow me with understanding so that the borehole you want to drill we make good meaning to you and there will be no quarrel with the contractor after drilling the borehole, as this may occur if you do not read this and finally embark on the project and could not get what you expected.
Coal city as the name implies is pre dominated with coal as everybody know, but this coal in geological terms is called SHALE and this type of formation does not yield much water due to their composition, not that they don’t have water, they do if you are able to carry out a geophysical investigation of the area by a good geologist who will be able to interpret the readings obtained during sounding.
The interpretation of the readings will be able to inform us about fractured and hard shale positions below ground level so that both the driller and the client will have pre knowledge of the yield of the borehole.
This result from the geologist is very important because it will inform us about the depth, the yield, the soil composition so that you know the type of rig that can do the work effectively without quarrel from the client.
Most predominant composition of this shale is clay and hard stone (chippings) and for anybody to break through these barriers must drill the borehole with DTH hammer rig that has the facilities of breaking those stones.
When this is achieved and drilling processes completed the installation of pump follows, in your pre drilling report from the geologist he will recommend the list capacity of pump to install based on the yield of the borehole and this stand true because of the composition of the soil, for shale or coal does not yield much water like that of sand, except there is a small sand / shale mixed up due to the way nature has formed it that you may see boreholes yielding like that drilled in sharp sand formation, apart from this mixed formation any other water that come into the well looks for cracks or fractures that it can flow through to get to the borehole.
This is the major reasons why boreholes drill in shale (coal) area always pump for some time and then stop for the next two to six hours as the water finds its way to the hole , it is not about depth, it is not about size of the hole but about the soil formation.
Many clients have had quarrel with their borehole service provider because they refused to read the geological report given to them and thereby zero their mind that they are spending their money to have borehole that will be productive 24 hrs, please client always read your report and ask necessary questions before embarking on any drilling.
The basic facts and truth about boreholes in (coal) shale formation in Enugu town, Agbani, Awgu, Ebonyi, Mpu, Mmaku, Bende
With these few facts about water boreholes in Enugu town you can go ahead to drill and own a borehole by conducting a geophysical survey of your location, and follow the recommendation, do not compare your neighbor borehole or hand dug well to yours if you already have one or you want to, for it is not by eye survey but by geophysical survey of your area.