Thursday, June 11, 2015

What's happening with the Runoff?

My client asked me to check in on the data we are collecting at the Penfield Apartments in St. Paul, MN.  She was curious how the green roof was retaining storm water this year, compared to last year.
Hey, Minnesotans, remember when we had all the flooding last spring and early summer with record high rain falls? News reports highlighted that much of the problem came from runoff from impervious surfaces (roofs, parking lots, roads)- and nature had reached its carrying capacity.  I blogged about this dramatic event last year.
Take a look at how a vegetated roof can perform to alleviate the damage from stormwater runoff from impervious areas!  You can see that in a normal year (2015) green roofs designed with either 8" or 16" soil can retain almost, or all of, the rain.  However, even the extremes of 2014 spring, green roofs had already reached their saturated capacity and were only able to capture about half of the storm water.  The systems did detain the rain for several hours before runoff, however.

To get more information on this project, please visit AD Greenroof's project page .  To dive into this public data further and do you own comparisons, you can get direct access here!

You can always reach me direct:

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