I live in a neighborhood of Washington, DC, where it is clear that old streams have been buried. Buildings, roads, and sidewalks shed water that would have gone

I live in a neighborhood of Washington, DC, where it is clear that old streams have been buried. Buildings, roads, and sidewalks shed water that would have gone into the ground, and storm drains carry a lot of it off. But you can see houses that have settled, almost certainly because they are where a stream was filled. And a neighbor found a sinkhole under his driveway some years ago, probably from an old stream. One can sometimes gauge where the streams were by the spacing and ages of the houses.