water source that was close to the center of the community. We considered several solutions to meet this objective. Based on the weighting of seventeen factors we determined that installing a drilled well with a hand pump was the best solution.
The presentation discussed regional geology, drilling methods, drilling observations, and how the well is constructed. The geology of the area that we are working in is relatively uniform and the bedrock is 500M-4.5B years old. Over the millennia the rainwater has slowly penetrated and decomposed the bedrock. At the surface the bedrock has completely decomposed down to a clay-rich material. The decomposition is gradually less significant as depth increases down to solid bedrock.
The drilling equipment is very similar to water well drilling equipment used in New England. A rotating air hammer fractures and grinds up the rock at the bottom of the hole, and the air lifts the ground-up rock to the surface. Information from three of the wells constructed was presented; the depth of bedrock ranged from 18 to 61 meters below the surface( mbts) and the bottom of the hole was 59 to 83 mbts.
expected from the well. The static water level ranged from 14 to 24 mbts, the total drawdown ranged from 7 to 36 meters, and the well recovery ranged from 64 % to 95 %. After the pump is installed a concrete pad and fence are constructed around the well to protect it.
In June of this year the NH-PRO, along with the UNH chapter, will be installing two more wells in this same region. We are always looking for new members. We get all our funds from donations. It costs about $ 14,000 to install a single well. If you or your employer would like to donate to help install future wells it would be greatly appreciated.
‣ We can be found at www. ewbnh. org
‣ Or you can reach me directly at jbenway15 @ gmail. com
After the hole is drilled, a pump test is performed. The purpose of the pump test is to determine how deep the pump should go and the yield that can be