The only way I’m aware of to pull that off would be a pump – and a pump isn’t cheap, would require more than a trivial amount of electric in a spot I’d rather not run it to (short of some major plumbing to run it back to house from the street, then back to the street from the house), and probably require a decent amount of maintenance. I was hoping (probably falsely) for something fairly cheap here. I priced some flow sensors (another approach) though, and if they’re any gauge, there probably isn’t a cheap way to do this. Now if you’ve got some trick I’m not aware of, please enlighten me – I’d love to discover there really is a cheap/easy way to deal with this.