Never, never under estimate Government's ability to come up with more intriguing ways to extract $'s from each and every one of us!
Now, 'water runoff retention' - another great example of some bureaucrat's mentality at work to come up with another 'revenue stream' to help keep he and his pals employed! They probably have some Office called the 'Water runoff retention' agency with a big budget and all the trimmings - hey, after all, they have to have enough staff to come around and 'inspect' your property's 'runoff retention' capabilities...WHAT A JOKE!