Tried the dumping you're describing a couple years ago at a campground. Used 1 inch swimming pool hose with PVC couplings to go from the Flojet to the dump station (about 100' and slightly up hill, maybe a foot of rise. Didn't work so well as the swimming pool hose would easily kink and stop the flow. I believe it would work on your application. The drop you describe you may even be able to dump using just the swimming pool hose without the FloJet. The 100 + feet I bought rolls up into a plastic storage bin just a bit larger than a shoe box.