I need to install a pump on my artesian well. I have no idea how deep the well is but it flows appx. 1/2 gallon a minute by itself. The house is on city water and the well will just be used for irrigation. My yard is just under an acre and the longest run from well to faucet will be about 100'. What type and size of pump do you recommend and do I need a tank for this application? Does the pump have to be placed near the well or will it work from a location say 50 feet from where the well goes down?