Its a little hard to tell from the pic. But the ponds are on a hill so it made it easy. One overflows into the next and so on. All the holes were overdug so i basically made my own small creek without a pond liner. It stays surprisingly clean and does its job of carrying water further away from my house. I started with one so i can always add another section at a time no prob. When the sump pump runs everything fills up and spills around each pond as well as at the bottom. I put in some flowers and marginal plants to fill in and suck up some of the ecess water. As for the rest of the run off i have a permenant 4-6' wide by 20' strip of the greenest grass in town lol...its always higher than the rest. Solved my prob. of a muddy patch in the lawn from waterchanges on 29 tanks. Excited to see what you do with these containers, i'd like to have some to play with 
