In advance of any bargaining session with the city regarding environmental impact, I wanted to calculate our existing gutter system.
Turns out the gutters direct only 22.2% of the roof rainwater to the front yard, 77.8% goes to the rear. At 38 inches of rainfall per year, that works out to 40,880 gallons of roof rainwater per year spread over the back yard, some of which will make it into Carkeek Park.
I hope I can show that the modified house will send more than 50% of the roof rainwater to the street, saving Carkeek measurably.
Friday, March 20, 2015
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