The opposite of rain water collection ...
The City of Detroit has had issues with collecting enough money on their water and sewerage charges for DOZENS of years. In the past, they just overcharged the suburbs, but now the water department is run by a board including representative from 3 counties that surround Detroit.
Because the vast majority of Detroit (like most large cities) has a combined sewer system, dealing with rain water runoff is a problem. They have added a charge to your water and sewer bill for every square foot of "non-permeable" surface you have on your property.
Time for gravel or other permeable hard surface in parking lots !!
Here, gravel is considered impermeable and is added to the monthly water bill


