What??? I don't get it...everyone where you live has barriers or something to keep all the rain that falls on one property from moving onto another's?

What does the water do now where the pond will be?

All the pond will do is catch water that moves into it. Once it's full, the water will do what the water did before the pond was there...unless you radically change the landscape around it.

I'm visualizing a neighborhood of many small depressions so water will stay where it falls and not move from place to place...