Basements are generally excavated seven to eight feet below the ground, and windows are frequently installed below grade which require window wells to protect the window from cave in. Groundwater is naturally attracted to these wells, even if they are covered, so the proper steps must be taken to prevent this water from pooling up and leaking into your basement or breaking the windows.
A proper drainage system and a sturdy, correct-fitting cover are a necessity in keeping your window wells clear and safe from leaves and debris. They also have a safety element to stop people from falling into these wells.