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When a villa owner decides to renovate a pool, draining looks like the simplest step. Start a pump, wait for the water to go, begin work. In reality draining is one of the most sensitive steps, because the water is part of the pool's balance. It presses on walls and floor from inside, while soil and any groundwater press from outside. Remove the water and that balance shifts. If this is not accounted for, the floor or walls can suffer damage that did not exist before. This article covers common draining mistakes, why they happen and how draining is managed safely within a renovation plan.
Why draining is a sensitive step
A concrete pool is designed to work full. The weight of water holds it in place and balances soil pressure. When it is emptied, three things happen at once. The weight holding the floor down disappears, soil pressure on the walls is no longer balanced, and inner surfaces are exposed to sun and air. Most residential pools drain without trouble when it is planned well, but on sites with shallow groundwater or damp soil, draining without study is a real risk. Draining should be an engineering decision, not just a site task.
Draining without checking groundwater
High groundwater pushes up on the pool floor. When full, the water weight balances this. Once empty, the upward pressure may be enough to lift or crack the floor, and in severe cases move the whole pool.
- Ask about the site and whether nearby excavations found damp or water.
- Check for a hydrostatic relief valve in the floor, which lets groundwater in instead of lifting the floor.
- If in doubt, dig a test hole near the pool to check the water level first.
- High groundwater sites may need dewatering around the pool during renovation.
Ignoring soil and water pressure on walls and floor
Even without groundwater, surrounding soil presses on the walls. A well-designed pool withstands this when empty, but an old pool with weakened concrete or corroded reinforcement may not. Clear structural cracks, rust stains bleeding from concrete or settling paths call for an engineering assessment before the water is removed. Partial or staged draining is sometimes safer than emptying in one go. See signs a pool needs a full drain.
Leaving the pool empty for too long
A frequent mistake is draining and then delaying the start while waiting for materials or workers. Meanwhile the pool faces several risks.
- Direct sun on tiles and waterproofing, heating quickly in a Riyadh summer and risking debonding or cracking.
- Concrete drying out after long saturation, which can cause hairline cracks.
- Dust and sand collecting on the floor and in pipe openings.
- Fall hazards for children and workers.
- Groundwater pressure, which grows riskier the longer the pool stays empty.
The rule is to drain as the last step right before work begins, with materials and crew ready.
Not coordinating draining with the schedule
Draining belongs inside the work schedule. Before draining you should know when removal starts, when waterproofing starts, how long each stage needs and when refilling will happen. Also plan where the discharged water goes so it does not flood the garden, neighbours or street, or harm the soil around the pool itself.
- Use a proper drainage pump, not the filtration pump, which can be damaged running dry.
- Choose a suitable discharge point beforehand.
- Switch off power to equipment and lights before draining.
- Cover or shade the pool if it will sit empty during hot hours.
- Place a barrier or warning signs around the empty pool.
How we manage draining safely
At YAM Pools draining is part of the full renovation plan. After a free site visit we follow these steps.
- Assess the site, soil and possible groundwater.
- Inspect the structure before removing water.
- Choose the method, full, partial or staged.
- Prepare materials and crew so work starts immediately.
- Drain with a suitable pump to a safe discharge point.
- Protect surfaces and the site throughout.
- Refill at the right time once materials have cured.
All of this is documented in a written quotation, with engineering supervision and a written warranty on workmanship and waterproofing. We serve Riyadh and all Saudi cities. See safe pool draining steps.
Frequently asked questions
Can draining damage a pool?
In some cases, yes, especially with high groundwater or a structurally weak shell. An assessment before draining sets the safe method.
Should I use the pool pump to drain it?
Better not. The filtration pump is built to circulate water, not empty the pool, and can be damaged running dry. Use a suitable drainage pump.
How long can a pool stay empty?
As briefly as possible, which is why materials and crew should be ready before draining. Long empty periods expose surfaces to sun and dust and raise risks.
What is a hydrostatic relief valve?
A valve in the floor of some pools that lets groundwater enter during draining instead of pushing the floor up. Its presence and condition are checked before draining.