Have Your Deck—and a Pond, Too!! Use rigid plastic tubs for the ponds, setting them into "sandboxes" under the deck. The deck boards were cut to follow the edges of the tubs. All together, the two tubs hold about 500 gallons of water and contain 18 large goldfish. A waterfall connects the higher tub to the lower one.
30 Beautiful Backyard Ponds And Water Garden Ideas