How to Drain a Flooded Pool: A Comprehensive Step-by-Step Guide

Flooded swimming pools can be a major concern for homeowners, especially after heavy rains or natural disasters. Standing water that exceeds the pool’s normal water level not only affects the functionality of the pool but can also cause structural damage, equipment failure, and issues with water chemistry. If you’re wondering how do you drain a flooded pool, the answer involves more than just removing excess water — it requires a strategic approach that safeguards your pool’s filtration system, prevents damage to surrounding landscaping, and ensures the safety of your property.

In this detailed guide, we’ll walk you through the most effective ways to drain a flooded swimming pool, the equipment you need, and the best practices to follow. Whether you own an in-ground or above-ground pool, understanding how to manage this situation can save you time, money, and potential headaches.

Understanding Why Pools Flood

Before diving into the steps for draining a flooded pool, it’s important to understand why this issue occurs in the first place. Common causes include:

• Heavy rainfall: Storms and flash floods can overwhelm even the best drainage systems.
• Poor pool drainage: If your pool lacks adequate overflow outlets or automatic draining features, water can rise above safe levels.
• Improper water level management: Some pool owners overfill their pools manually, not accounting for potential rain.
• Natural disasters: Hurricanes or plumbing failures can all lead to a sudden influx of water into the pool.

Understanding the cause helps you prevent future flooding and tailor your draining approach accordingly.

Is It Necessary to Drain a Flooded Pool?

There’s a common misconception that draining a pool completely is the best solution. However, this is not always necessary or advisable. Here’s how you can assess the situation:

When Draining May Not Be Needed

• If the water has risen only slightly above the skimmer level, the pool may drain naturally over time if your overflow system is functional.
• Modern in-ground pools often have hydrostatic relief valves that can manage minor water level increases.

When Draining Is Essential

You should consider draining your flooded pool if:

• Water has reached the coping or deck level.
• There’s visible damage to the pool structure or surrounding area.
• Stormwater contaminants have entered the pool, such as mud, oil, or debris.

Draining in such cases prevents long-term damage and costly repairs.

Tools and Equipment Required to Drain a Flooded Pool

Proper preparation ensures efficiency and safety during the draining process. Here’s what you’ll typically need:

Optional but helpful:

• Extension cords or a generator (for electric pumps)
• Gloves and goggles (for safety)
• Tools for adjusting water valves or uncovering pumps

Step-by-Step Guide to Draining a Flooded Pool

Now that you understand when to drain a pool and what tools you need, here’s a detailed process to safely and effectively reduce the water level in a flooded pool.

Step 1: Assess the Water Level and Structural Integrity

First, visually inspect the water level. Is it up to the coping, spilling onto the deck, or beyond? If the water level is dangerously high, especially if the flooding is due to storm runoff, draining is critical.

Also, check for:

• Cracks or bulging in the pool wall
• Any signs of erosion around the pool deck
• Damaged pool equipment, such as the pump or filter

Step 2: Turn Off Electrical Equipment

Safety first! If your pool has any electronic equipment such as lights, heaters, or automatic cleaning systems, turn them off completely to avoid electrical hazards. If water has reached these components, consult an electrician before restoring power.

Step 3: Open the Skimmer and Drains

For minor overflows, simply opening the skimmer basket and ensuring the main drain is clear can allow the water to naturally lower over time. Removing debris will aid this process.

Step 4: Use the Pool Pump

If your pool pump is still operational and accessible:

1. Set the filter to “waste” mode (if available).
2. Attach a hose to the pump’s waste line and direct the outflow away from the pool foundation.
3. Run the pump until the water reaches the desired level.

Note: Running the pump on “waste” mode for too long can drain the skimmer line. Monitor water levels and switch back to circulation when necessary.

Step 5: Use a Sump or Submersible Pump

For faster and more manual draining, especially in cases of major floods, a sump pump or submersible pump is the best solution.

Here’s how:

• Place the pump in the deepest end of the pool where the water is deepest.
• Attach a hose to the discharge outlet and direct the water flow downhill to a safe location like a storm drain or garden area (not into your septic system).
• Plug in the pump and operate until the water reaches a manageable level.

Step 6: Monitor and Adjust Water Level

The optimal water level is typically halfway up the skimmer opening. If you drained too much, you may need to add fresh water using your garden hose. Use a water test kit to rebalance chemicals as needed.

Step 7: Clean the Pool

Flooding often introduces contaminants like dirt, leaves, and chemicals from stormwater runoff. Clean the pool thoroughly:

1. Skim or vacuum the debris from the surface and bottom.
2. Brush the pool walls and floor to prevent algae buildup.
3. Run the filtration system and backwash the filter if needed.

Step 8: Test and Treat the Water

After cleaning, test the water using a reliable test kit and adjust:

• Chlorine
• pH
• Alkalinity
• Calcium hardness

Floodwater dilutes these levels, and imbalance can lead to cloudy water or corrosion.

Common Mistakes to Avoid When Draining a Flooded Pool

Avoiding these pitfalls can save your equipment, structure, and landscaping:

Mistake 1: Draining the Entire Pool

Draining your pool completely can be dangerous. Without water pressure, underground pools are at risk of floating or popping out of the ground due to hydrostatic pressure from groundwater below.

Mistake 2: Discharging Water Improperly

Dumping large volumes of water near your home’s foundation or onto neighboring property can lead to erosion or waterlogging. Always discharge water away from the pool and property to storm drains or natural depressions.

Mistake 3: Using Pool Pumps Incorrectly

Running your pool pump in “waste” mode for too long can cause it to overheat or damage the filter system. Always monitor and adjust as needed. Similarly, using a pump not rated for high-volume water can lead to inefficiencies or motor failure.

Mistake 4: Neglecting Water Chemistry Post-Drain

Flooded pool water often mixes with contaminants and different sources of water. Failing to retest and rebalance the pool can result in an unhealthy swimming environment and long-term maintenance issues.

Different Pool Types and Draining Approaches

Your pool type — in-ground or above-ground — significantly impacts the draining process.

In-Ground Pools

These pools require extra caution due to hydrostatic pressure. Never drain completely — always keep at least 1/3 to 1/2 of the water in the pool during heavy draining. Consider professional assistance if using manual draining methods.

Above-Ground Pools

Above-ground pools can technically be drained fully, but only if structures and soil permit. Ensure the ground beneath the pool is dry and stable before draining thoroughly. Otherwise, uneven weight distribution or shifting can damage the walls or liner.

When to Call a Professional

While you can handle minor flooding on your own, there are situations when it’s best to seek help:

• Damaged or non-functional pumps
• Uncertainty about water level safety
• Pool water contaminated with chemicals or hazardous materials
• Structural concerns like cracks or leaks

Professionals have access to industrial-grade pumps and water restoration techniques. Hiring a licensed pool service can save time and liability, especially after severe flooding.

Preventing Future Pool Flooding

Once you’ve restored your pool to operational condition, take proactive steps to avoid future flooding and minimize draining needs:

Install or Maintain Overflow Drains

Overflow drains act as automatic relief valves when water reaches a certain level. Regularly inspect and clear them of debris to ensure functionality.

Use a Smart Pool Cover

A solid safety cover or automatic pool cover can prevent excess water from entering during storms or heavy rains. These covers are especially useful in regions with unpredictable weather.

Improve Yard Drainage

If your pool area regularly faces runoff or standing water, consider improving the grading, gutter systems, or French drains around your property. This controls water flow and prevents pooling near the pool.

Monitor Water Levels During Rainy Season

Before and during heavy rainfall, check your water levels manually and adjust as necessary to avoid overflow.

Conclusion

Knowing how to drain a flooded pool is an essential part of pool ownership, especially for those living in areas prone to heavy rainfall or seasonal flooding. While the process may seem daunting, understanding your pool type, preparing the right tools, and following a systematic approach can make draining not only manageable but efficient.

Remember, it’s not always necessary to remove all the water. Strategic draining that maintains pressure balance and protects equipment is usually the best solution. Always consider safety, efficiency, and long-term maintenance when handling flooded water — and don’t hesitate to bring in professionals for complex situations.

By following the tips and methods outlined in this guide, you’ll be well-equipped to manage pool flooding and keep your backyard oasis in top condition year after year.

Why is it important to drain a flooded pool correctly?

Draining a flooded pool properly is crucial to prevent damage to the pool structure and surrounding landscape. Rapid or improper draining can cause the pool to float out of the ground due to hydrostatic pressure from groundwater, especially in in-ground pools. This can lead to severe structural issues, including cracks and shifting, which can be costly to repair. Safety is also a concern, as standing water can become a breeding ground for mosquitoes and pose a risk of electrical hazards if nearby equipment becomes submerged.

Additionally, proper drainage helps protect the environment and your property’s drainage system. Pool water often contains chlorine and other chemicals that can harm plants, soil, and local waterways if released improperly. It’s important to test the water and allow chlorine levels to dissipate before discharging it. Planning the drainage route carefully and using a sump pump or submersible pump with a hose will ensure the water is directed away safely and responsibly.

What equipment do I need to drain a flooded pool?

To drain a flooded pool effectively, you’ll need several key pieces of equipment. A submersible pump or sump pump capable of handling large volumes of water is essential. A pump with a higher gallons-per-hour (GPH) rating will speed up the process. You’ll also need a long, durable discharge hose that can reach a safe drainage area, and hose clamps to secure the connection to the pump. A garden hose may also be useful for rinsing debris afterward.

Optional but highly recommended items include a wet/dry vacuum for removing sediment at the bottom, a chlorine test kit to ensure water is chemically neutralized before release, and protective gear like gloves and safety goggles. Extension cords (if needed) should be heavy-duty and outdoor-rated. Having a backup power source, like a generator, might also be necessary if the flood has caused a power outage and your pump requires electricity.

How do I determine the best drainage location for the pool water?

Before draining your flooded pool, it’s important to choose an appropriate drainage site. Avoid discharging the water near your home’s foundation, septic system, neighbors’ properties, or any natural bodies of water like streams or ponds. Ideally, the water should be released into a storm drain or public sewer system, if municipal regulations allow. If discharging onto your yard, select an area with good slope and away from landscaping or structures to minimize damage and erosion.

You should also test the chemical content of the pool water to ensure chlorine and pH levels are within safe limits before releasing it. Municipalities often have specific rules about where and how pool water can be disposed of, so be sure to check with your local public works department prior to starting the process. In some areas, you may be required to dechlorinate the water using a chemical neutralizer or by letting it sit exposed to sunlight for several days to evaporate chlorine naturally.

Can I use a garden hose to drain my flooded pool?

While a garden hose alone cannot efficiently drain a large volume of water from a flooded pool, you can use the siphon method in some cases. To siphon, place one end of the hose at the bottom of the pool and run the other end to the desired drainage point, ensuring it is lower than the pool end. Fill the hose with water to start the flow, then once water begins to flow, gravity will help empty the pool gradually. This method is slower and less efficient than using a pump, but it can work in emergencies.

However, relying solely on a garden hose is not ideal for significant flooding due to the slow drainage speed and the constant need to refill or reposition the hose. Additionally, if the water is chemically untreated, the hose might degrade over time. For faster and safer results, use a submersible pump with a heavy-duty discharge hose. A garden hose may be more appropriately used for rinsing debris or topping off water after the draining process or for siphoning small volumes from skimmers or drains post-drainage.

What steps should I take before using a pump to drain the pool?

Before using a pump to drain a flooded pool, ensure that it is safe to work around electricity in wet conditions. If there has been a power outage or water has come into contact with electrical components, consult a licensed electrician to assess the situation. Turn off all pool equipment, including circuit breakers connected to the pump, heater, and lights. Also, remove any floating debris from the water’s surface using a net or skimmer to reduce the risk of damaging the pump and to speed up the process.

Next, inspect the pool for structural damage. If the walls are bulging or cracked, draining the pool could worsen the issue. Allow the surrounding ground to dry as much as possible to prevent erosion during drainage. Test the pool water with a chlorine test kit and treat it with a dechlorinating agent if necessary. Finally, check your local regulations regarding water disposal, and prepare a safe discharge route that avoids property damage and environmental harm.

How do I protect the pool surface while draining?

Protecting the pool surface during the draining process is vital, especially for vinyl-lined or fiberglass pools. Before beginning, consult your pool manufacturer or a professional if it’s an in-ground pool, as improper draining can lead to floating or damage. If it’s safe to proceed, try to keep at least a few inches of water at the bottom to prevent the liner from drying out, shrinking, or developing wrinkles, which are difficult to fix once they occur.

In areas with high water tables, it may be necessary to drain the pool slowly—sometimes in stages—depending on the conditions. For concrete pools, inspect for cracks or weak spots that could worsen when empty. If you’re planning on completely draining and cleaning the pool, do so immediately after drainage while the surfaces are still damp to avoid residue buildup. Finally, cover the drained pool or at least the skimmer area with a protective tarp to prevent debris from re-entering.

When should I call a professional to drain my flooded pool?

You should call a professional to drain your flooded pool if you’re unsure about the structural integrity of your pool or if the water level poses electrical or safety risks. If there has been significant damage from the flooding, such as bulging walls, cracks, or compromised plumbing lines, attempting to drain it yourself could lead to further harm or personal injury. Professionals have the expertise to assess the pool’s condition, determine safe drainage methods, and restore it afterward.

Additionally, if your local municipality enforces strict regulations regarding pool water discharge or if there are environmental considerations near your property, hiring a contractor experienced in pool restoration can be beneficial. Professionals are equipped with industrial-grade pumps, dechlorination systems, and knowledge of safe water removal methods. In cases of severe flooding, it may also be prudent to check with your insurance company before proceeding, so a professional assessment is strongly recommended.