Even in the absence of urban development where there is more rain runoff, heavy rain will lead to more flooding. (wxshift.com)
We can't comment much on the veracity of any, but here they are: The U.S. Coast Guard told a reporter from News 12 Hudson Valley that the sheen was fuel from rain runoff upriver and that the amount was only 5 to 10 gallons. (riverkeeper.org)
Update: Officials from the Coast Guard, the lead agency on the investigation, say its pollution teams discovered the diesel is actually rain runoff from somewhere up river, not from a tugboat as originally reported. (nyenvironmentreport.com)