Big Green: RE:White roof water temp runoff?

[John E. Beeson]

no prob.  I didn't give a lot of information because really all I was
looking for was the temperature of water coming off of a white roof
during the summer.
 
The first flush of rain hitting the roof will be in direct contact with
a very warm surface, thereby transferring heat to the water.  The water
goes down a pipe, out a scupper and into a plant bed, then into a
cistern type area for storage and such.
 
Say  hello to Bill for me!

________________________________

From: Heather Walters [mailto:hwalters at dotyandmiller.com] 


Maybe I'm missing something, but if it is raining (to feed the cistern)
the roof will not be at its maximum temperature and the plants will not
require irrigation for a while.

 

So the water should not be used for a while and would have a chance to
cool off even if it was hot...  

 

I would imagine the cistern design would be more important.  Could you
put a temp sensor in the cistern and not irrigate when the temperature
is more than X degrees, that may force night time irrigation which is
better for plant health and water use (less evaporation) anyway...

 

 

Heather Walters , LEED AP
Doty and Miller Architects 

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