I just did a runoff study for a large neighborhood watershed here in San Diego. I used the County recommended runoff coefficients. I drove through the neighborhood to make sure I didn't miss anything relevant and noticed almost everyone is replacing their lawns because of the drought. Good! But they're generally replacing lawn with decorative rock over a sheet of impervious plastic. In my case, I get a 5 percent increase in the runoff if I consider the additional area as impervious.
Anybody else dealing with this?
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