Yes there is a shut off on return to the waterfall. The pond is 5’ wide 14’ long and 4.5’ to 5’ deep. I built it like a pool/Jacuzzi, Rebar Frame / shotcrete then put a layer of Cement with sand and 1: 1 acrylic sealer and water mix. Then sealed the inside with two-part Plastic acrylic Paint. The pond has a Jacuzzi skimmer to one end and two return on the other end, bottom Drain, Vacuum line and a return to the waterfall. Also installed a 3/4 line for an air diffuser just over by the drain and diffuser sits just over the Drain. I filled it today some small leaks on the top corner of the glass. So I am draining now so I can fix the leaks tomorrow.