All you have to do is match the size of the windmill to the depth you need to pump from and if you are pushing water in a pipleline and storage system. On our place we have two 14' mills, one that pulls from about 350' foot using 2" pipe and barrell that goes into a pretty flat pipeline and storage system. The other mill pulls from a 30' well and pushes several miles of pipe up a very steep slope to the storage and drinkers, the pipe line runs just under max pressure at the well head.