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Pavement is just the beginning and is a simple, first order issue. 300+ years of abuse and modern development combine to make hard issues. One new area of research is "legacy sediments", the rapid erosion filling Mid Atlantic valleys from the first settlers rapidly deforesting the hills...

I will say NJ has been working on this for a while and is ahead of the curve, but getting a handle on non-source point pollution is difficult. It is easy to walk a stream and check what is coming out of pipes, but the non-point source stuff is difficult. It starts with timing; most of the...