Founder Effect. The Founder Effect is defined as a type of bottleneck, a type of genetic drift describing the loss of the allelic variation that accompanies founding of a new population from a very small number of individuals (a small sample of a much larger source population).
For example, two well drilling companies -- one in Pennsylvania and one that covers New Hampshire, Vermont and central Massachusetts -- state the cost for drilling a well and outfitting it with pump equipment averages between $5,000 and $7,000, at the time of publication.
Medium depth Well: for wells up to 200 ft deep, many pump choices are available. With modern casings and well caps, contamination is rarely a problem. Deep Well: for wells 200 ft to 450 ft, the pump choices go down, while the cost of the well and the pump system can exceed $10,000. Contamination is rarely a problem with the well itself. Very Deep Well: for wells over 450 ft, you have fewer choices still. Well drilling & pump costs combined can exceed $20,000.