True to us sensible scientists, but not to State of Maryland. The only thing that redevelopment buys you now is cutting inches of rainfall from 2.2 (roughly) down to 1 inch. If you put impervious on impervious, you still have to do quality control (ESD) as of c. 2015. (Was phased in 50%, 75%, now 100%) . And, in Prince George's, as of 2019, you have to do quantity control too, even though you are replacing roof with roof.
Redskins stadium made some covered parking by making their carport roof out of PV panels. Clever.
VA is more sensible than MD. But I've long told clients...never try to make sense out of environmental laws.