Does anyone know what the minimum size gas water pump I may need to make this happen? The creek is about 400ft behind my house and is down a slope at an angle of about 10 degrees. I dont want the water to hook up to my current irrigation but instead will have a hose connected to it with a sprinkler attached. With the summer around the corner, running my irrigation all the time will make my water bill skyrocket and my wife go bonkers. So I figured since there was a creek behind my house I should figure out a way to get the water for free and just pay for the gas. Thanks in advance.