Well and bore water found underneath the earth’s surface come from flowing rivers and rain. The rain or river water seeps down through the soil layers and past the underlying rocks. At a certain depth, there are rocks that have high water retention power and do hold the water that seeps down. An area that holds water and allows its minimal movement underground is known as an aquifer. The two types of aquifers that exist are confined and unconfined aquifers.
A confined aquifer consists of a rock that overlies a collection of water. The solid rock thus causes the water to be in a ‘closed’ state. On the other hand, an unconfined aquifer lacks a protective layer of rock. The water in an unconfined aquifer thus varies with the water table.
When it comes to drilling a confined aquifer, experts from Carlyle Drilling describe that the level of the bore and the source feeding the aquifer are important factors to consider. If the water source is higher than the bore level, water flows easily without the need for pumping. The resultant feature is an artesian well.
Well Construction Process
For a successful water well construction project, consider hiring licensed water bore driller . The well construction process majorly involves a number of basic steps.
1. Bore drilling on top of the aquifer. This involves drilling the bore past the soil layers and reaching the aquifer.
2. Formation of a water well wall using steel casing. When fitting the casing in larger bores, the space between the edge of the bore and the casing is put to fill with stones.
3. Deeper drilling of the bore through the aquifer. Sometimes a screen installation is done to reduce the number of small rocks and sand in the pumped water.
Contact professional well and bore drillers with NZDF membership who will combine their top skills with great machinery so as to offer you drilling services that you can count on.