I've been transferring from one pond to another. Pumping thru 2000' of 3" poly has quite a bit of friction but still getting 100 gpm with a 3" honda / northstar setup. I've raised the receiving pond a good 18" and I think that will be fine for the upcoming winter. We got an inch of rain in last 24 hrs so that has helped a little. I have a second 2" simple trash pump moving water into some smaller ponds via 300' of lay-flat hose. Getting a good 50 to 60 gpm on that setup.