Deck Drainage for a Swimming Pool

Sloping

• The patio needs to slope gently to encourage any water that splashed onto it to drain, either off of the structure or into a set of drainage devices. A slope of 1/4 inch of drop for each foot of the structure is required according to River Pools and Spas. This slope should run away from the pool, not towards it. Draining the water into the pool may sound like a good idea, but in fact the debris from the surface of the deck will disturb the pH and bacterial balance of your pool water.

Drainage For Concrete

• Pouring a concrete slab around an in-ground pool creates a smooth and durable deck for relaxation and pool parties. However, standing water creates a serious slip hazard. Square metal drainage channels need to be installed around the perimeter of the deck where the slope directs the water to flow, says Trench Drains. The drains need smooth grate covers that won't hurt bare feet where swimmers are walking around the pool.

Wood Deck Drainage

• Since an above-ground pool can't be surrounded by concrete or bricks, many homeowners choose to build a wood deck around it instead. Like all water, pool water can cause rot and damage to the wood. Sealing the deck annually ensures the deck remains safe for years. The gaps between boards allows a wood deck to drain, but if you are worried about the water disturbing the ground below, UnderDeck recommends installing a wood-porch drainage system that catches and directs the water to a location of your choice.

Problems

• Even after installing drains and sloping the deck correctly, you'll need to consider where the excess water is being diverted to. When water drains into soil that contains some amount of clay, it swells and shifts, according to Missouri University of Science and Technology. Draining the water too close to your foundation causes lifting that creates cracks and weakens the structure of your home. The water will also interfere with the proper operation of a septic tank if drained near or onto its drain field.