I have a small river that runs through my land, and want to use it for irregation for my vegetable plots. What is the best pump and horsepower to use. Should I use more than one? The plots are a total of about an acre, the largest being 200'x200'. It is a slow grade down to the river of about 200' and another 200-300 feet to the gardens. A sump pump dosen't seem to have enough power to get a good flow that distance. Yes I have water rights to use the river as an irrigation source.