RE_ Crabtree Detention Outfall-email from EOR.pdf
From:Jared Underbrink
To:McConnell, Jeanie
Cc:Vicky Do;Greg Guillen;Richardson, Zachary
Subject:RE: Crabtree Detention Outfall
Date:Friday, December 8, 2017 8:28:02 AM
Attachments:image002.png
That makes sense. I understand they have some utilities to get through along that run. I just put the site in
WWHM and the 100 year is 0.13 cfs which should work fine in a 6” pipe at 1% (0.4 cfs capacity).
Thanks,
Jared Underbrink, PE | Project Manager
250 4th Ave S Ste 200, Edmonds, WA 98020
p. 425.778.8500 | f. 425.778.5536
www.cgengineering.com
From: McConnell, Jeanie \[mailto:Jeanie.McConnell@edmondswa.gov\]
Sent: Friday, December 08, 2017 7:56 AM
To: Jared Underbrink <JaredU@cgengineering.com>
Cc: Vicky Do <VickyD@cgengineering.com>; Greg Guillen <GregO@cgengineering.com>; Richardson, Zachary
<Zachary.Richardson@edmondswa.gov>
Subject: RE: Crabtree Detention Outfall
Hi Jared,
You are correct that the simplified detention sizing tied to the 2016 storm code says 8” or 10” … in the case of
the Crabtree project it would be 10”. There is some debate over whether this is necessary and if you are able
to confirm that a smaller pipe size would be adequate for the flows from this project site, the City would
approve it.
Thanks for checking!
-Jeanie
From: Jared Underbrink \[mailto:JaredU@cgengineering.com\]
Sent: Thursday, December 7, 2017 8:52 AM
To: McConnell, Jeanie <Jeanie.McConnell@edmondswa.gov>
Cc: Vicky Do <VickyD@cgengineering.com>; Greg Guillen <GregO@cgengineering.com>
Subject: Crabtree Detention Outfall
Jeanie,
On the Crabtree Residence we have the detention outfall called out at 12”. I do not know why we did this but I
assume that for whatever reason we thought it was a requirement for a pipe connecting into the right of way?
The contractor called and asked if that could be reduced saying that you would approve as low as 6” with an
email from me. I just wanted to check in and make sure that sounds right.
Looking at the stormwater handout that was in effect at the time it seems like it ought to be 8” or 10” (I think
the second “bolded” note is supposed to say 4,000 to 5,000 tributary area). We had just over 4,100 sf, so I
think it would only be able to be reduced to a 10”.
Thanks,
Jared Underbrink, PE | Project Manager
250 4th Ave S Ste 200, Edmonds, WA 98020
p. 425.778.8500 | f. 425.778.5536
www.cgengineering.com