I am going to be suppling my pond with well water next summer to maintain a certain level. My well head is about 100 yds from my pond. I will rangefind it soon. Can anyone advise what hp pump (this will have to be above ground) and what size pipe should be run this distance to pump as much as 20000 gallons at a given time? I would like to be as economical and efficient as possible. Should there be a supply tank and if so what purpose would it serve?

Bill