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Hydraulics and Lawns

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BUGGAR

Structural
Joined
Mar 14, 2014
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1,732
Location
US
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?
 
Don't sweat it. It doesn't rain in California anyway, right?

(I kid)

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -
 
My claim to fame is I have been present in San Diego both times it has rained in the past 20 years.
 
The day I chose to visit the site had the wettest rain for July in the history of San Diego. Calculations said I was standing next to 18 cfs coursing along the gutter. Time of concentration under 5 minutes. The street was pretty much a river. I haven't had this much fun since I was a kid! And I get paid for this!
ps. I'm doing this because of construction that diverted this flow from one drainage basin to another. Big downstream consequences. I'll send a note to the County about updating their drainage manual. Lets all sing, "It Never Rains in Southern California".
 
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