We have similar drainage fees here in Houston, based on the amount of impervious ground cover on the property. We've had a lot of flash flooding in the past 20

We have similar drainage fees here in Houston, based on the amount of impervious ground cover on the property. We've had a lot of flash flooding in the past 20 years because of the growth of neighborhoods and commercial properties with large parking lots on what used to be prairies on the perimeter of town. New commercial construction typically has to have catchment basins, permeable concrete, or other runoff mitigation strategies. There is, however, a lot of legacy properties which don't handle their runoff, and an outdated storm sewer system, so we still have problems.