Build a "Pond in a Box" Raised Water Garden

Materials

• Pressure-treated lumber: six 8-ft 1x2s, two 8-ft 2x2s, two 8-ft 2x4s, seven 8-ft 2x8s
• Deck screws (2″, 2-1/2″, 3″, 3-1/2″ corrosion-resistant flathead)
• Wood shims
• Pond liner (≥66″ square, 35 mil thick)
• Pond pump-and-fountain kit

Construction

1. Cut & assemble base frame. Cut 2x2s for base frame; fasten with 3″ deck screws (drill pilot holes).
2. Build base deck. Crosscut 2x8s to five 36″ pieces, place edge-to-edge, trim to 36″ total width. Screw base frame to decking with 2-1/2″ screws. Flip, position, level with shims.
3. Make two boxes. Cut eight 2x8 side pieces to length; assemble into two boxes with 3-1/2″ screws. Place first box on base; miter 1x2 banding around perimeter.
4. Add banding. Center banding on joint line; fasten with 2″ screws into both box sides and base.
5. Stack second box. Add two more band sets: one straddling the joint, one flush with top. Notch one corner (1/2×1/2″) for pump cord.

Installing the Liner

1. Cut liner. Trim to 66″ square (1-1/2″ allowance). Center in box.
2. Pleat excess. Distribute surplus evenly or to one side. Staple near top of each side. Trim flush with top.

3. Position pump. Place pump in box, route cord through notch. Cut and screw 2x4 cap strips in place. Verify location (full sun best) and level—once filled, the box weighs ~600 lbs and cannot be moved.

4. Fill with water. Use garden hose. Wait 24 hours before adding fish. Plug in fountain and enjoy.