Sump pump in window well
We have a very large (21' X 6') window well in our basement. In Colorado it doesn't rain much, but we occasionally experience very localized thunderstorms that can dump huge amounts of rain (1/3 of a year's worth) in a few hours. This happened two years ago, and the window well began to fill up with water, eventually causing water to leak in at the base of the windows and to flood the unfinished basement.
Now we've finished the basement I'd like to avoid a repeat of this mess. The bottom of the well is a few layers of gravel over very compacted, clayey soil. I have two possible ideas:
1) Dig a shallow trench and lay in some perforated pipe with a sock. Connect this to a sump (probably a 5-gal bucket) buried in the well. Put in a pump to pump out any water.
2) Forget the pipe. Maybe slightly grade the soil to tilt the bottom of the well to one end. Put the bucket and the pump at that end.
The grading of the house is fine. The problem is the rain that actually lands in the well, not water flowing from elsewhere. The well is so large that it would essentially be impossible to cover it. When the basement was refinished, I had a GFCI outlet put in outside in the window well.
Any comments or other suggestions?