When basement window wells fill with water, it usually indicates poor surface grading. On older homes sometimes the drain in the bottom is is clogged. To correct the grading problem, the surrounding soil or other surface must be sloped away from the window well. This may require raising the window well. Observe the surface water during a heavy rain, and you will see what needs to be done.
The ground should slope away from the house at a pitch of about 1 vertical inch per linear foot. Hard surfaces such as concrete should slope away ΒΌ inch per foot. Downspouts and sump pump discharges must be directed well away from the foundation and window wells.
Additionally, the window well should fit tightly to the foundation. The well should extend about one inch above grade and several inches below the window. Keep the well free of plant material and other debris. Ideally the window well is dug out to a depth of 18 inches below the window opening and filled with gravel to allow for drainage.
Window well covers only divert rainwater; they offer limited protection.
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