6 Ways to Prevent Basement Flooding


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Basement flooding usually occurs when groundwater finds the path of least resistance. That path could be a crack in your foundation wall or slab floor. It could also be coming up through the cove joint between your wall and floor. Water can find its way through gaps in concrete steps, window wells, or cellar storm doors.

There are six things you can do to prevent flooding inside your basement. If any of these suggestions fail, then it may be time to call a basement professional. But before you do, give these suggestions a try. You could solve your problem with little or no money.

Roof Gutters

Clean out gutters of all dead leaves, loose twigs, and acorns which can dam up and restrict water flow. The debris can block the water from entering the downspout. Water will fill the gutter and flow over the side to the ground. During a large storm, rainwater can amplify ground saturation around your house in less time. The weight produced by lots of water in the soil can increase pressure around your home.

cleaning out gutter to prevent basement flooding
Clean gutters after fall season ends and before spring starts. Overflowing gutters can saturate the ground around your foundation and add to your basement flooding problem.

In the northeast United States, it rains on average 53.3 inches a year. That is a lot of rainwater to exploit every nook and cranny around your foundation. If you decrease the ground saturation, then you reduce the ground pressure. You will make it more difficult for water to push its way through. Clearing your gutters is a first good step in preventing flooding in your basement.


Downspouts can also get clog with debris that accumulates in your gutter. The same dead leaves and twigs can get jam in a downspout and push water through seams or back water up to the top. Insert a long water hose with a high-pressure nozzle into the downspout from the roofline. Turn on the water hose. The force of the water should be strong enough to push debris all the way through.

downspout without any drainage connection to dry well
Downspouts are useless unless they are connected to landscape drainage. Direct water away from the foundation area.

Most homeowners have a simple splash block at the bottom of their downspout. The splash block is doing nothing to prevent ground saturation. All that rainwater you divert from your roof, through your gutters, and out the downspout is in the ground. The same ground we are trying to prevent from saturating and basement flooding.

The best way you can divert water from roof to ground is to connect the downspout to a dry well. A dry well begins with a drainage pipe buried in a trench and packed in stone. The pipe runs at a gradual downward pitch at least 15 feet or more from the downspout until it reaches a bubbler pot. The bubbler pot helps water percolate into the hardpan clay soil. In the hardpan clay, water will migrate away from your house.

Grade the Ground

If you find your yard sloping towards your house, you may already have basement flooding. It is always wise to have a lawn that slopes downward away from the house at 1-inch per foot for 10 feet. It can help to keep average storms from overwhelming your basement.

Septic Tank

Sometimes we forget when last the septic tank was pumped clean. All used water from showers, bathtubs, sinks, dishwashers, washing machines, and toilets end up there. Then, combine a torrential storm to flood the ground surrounding your property, including your over-full septic tank. You have a recipe for disaster. Make sure you keep your septic tank clean with timely spring cleanouts. Most septic service professionals will make sure you get a courtesy reminder every 2 to 5 years.

Sump Pump

Suppose you already own a submersible sump pump inside a subfloor basket test it once a year. Sump pumps are machines. Machines break, so don’t get complacent about your sump pump’s mechanical condition. Pour a gallon of water into the basket to see if it turns on. If not, check if it is getting power. Make sure the fault-protector is in the correct position. You may have to push the reset button. Move the float up and down to make sure the pump switch is not stuck. Clear any debris from the bottom of the basket with a wet vac. If all else fails, replace immediately.

submersible sump pump lowered into a sump basket
Submersible sump pumps are always ready to pump out any water that leaks into the basket. Water is pumped through a discharge line that leads outside the house.

A portable sump pump can be handy during emergencies to minimize basement flooding. Connect a water hose to the pump and lead the hose outside far from the house. Ensure the pump is in the lowest part of your basement, where water tends to pool up the most and connect to a power source.

Backup Battery or Generator

A sump pump backup battery can give you peace of mind when the power goes out during a big storm. Depending on the severity of the problem, a backup battery can help for 2 to 5 days, sometimes an entire week. Unlike a generator, it does not rely on gas or propane to run, and it is a more affordable solution.

Home standby generators are powerful and can save you from spoiled food during a power outage. They may be expensive but they ensure your sump pump is running as well as the rest of the house.

A generator can power an entire house and your sump pump. You can continue to have heat, hot water and keep food cold in the refrigerator. It is a more expensive option because of the rising fuel cost, but the convenience is worth it for some. Home standby units need special installation and maintenance costing $20,000 or more. Depending on where you live, you may not have much of an option.

When All Else Fails

Sometimes your basement flooding is more than having clogged gutters and downspouts. We have found homes with a perfect sloping lawn and managed by responsible homeowners to have a flooding basement. If you need a basement waterproofing expert to help you with your water problem, give us a call.

Our inspections are free and no-obligation. We will find the source of your basement leak, tell you why it’s happening, and how to stop it. Don’t delay. Give us a call at 888-748-2002, so we can set up an appointment.

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