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Don't have room for a water garden? Try this beautiful pond-in-a-box alternative. To make one yourself, just follow these easy instructions.
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From two 8-foot-long 1×8 cedar boards, use a circular saw to cut two 30-inch-long sides and three 15-inch-long pieces for the ends and divider. On the piece that will be used as a divider, measure 3/4 inch from one long edge and rip-cut the board along the marked line.
From 3/4-inch-thick pressure-treated plywood, cut a 14-1/2 x 28-1/2-inch panel. From a 1 x 2 cedar board cut four pieces 7-1/4-inches long.
Temporarily clamp a side to the plywood bottom panel with equal overhangs on both ends (Deck Pond Project Diagram). Drill 1/8-inch countersunk pilot holes and remove the clamps. Apply waterproof polyurethane glue to the edge of the plywood floorboard and screw the side to the floorboard. Glue and screw the two ends to the floorboard and side; then attach the other side.
Use polyurethane glue sparingly to avoid excessive foaming from the joint. When driving deck screws, drill pilot holes at least 2-1/2 inches deep to avoid splitting the plywood.
To create a section for the planting bed, glue the divider in place. After the glue dries, drill 1/8-inch pilot holes and drive screws to reinforce the joint. Glue and clamp the corner corner cleats where shown. After the glue dries, add 6d (2-inch) finishing nails to reinforce the joint.
Paint the inside of the box with rubberized sealant, or install a pond liner (a liner is preferred if you're planning to add fish).
On the garden side, drill two or three holes in the base to provide drainage for plants. Set the 30×15-inch box on bricks to elevate it.