My window wells never had a drain so when they did fill up they leaked through the window into the basement (down wall into drain channel around perimeter of basement floor into a sump pump. Pump pumped it out of the house about 12" and the system recycled itself!
I extended the sump discharge 20' away; still had some water in well. Builder wanted to drill a hole in foundation to drain the window well into the house and into sump pump. Not my idea of keeping water out!
I finally installed a drain in well that goes out downhill about 15'.
This only works if you've room to pitch your drains away from the house. Otherwise you'll have to do as suggested and connect to your foundation perimeter system if you have one. If not, water flows downhill; install whatever you need to get it downhill.
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