Hi Erik or Jon,
Can you answer Rob’s questions below regarding the DMR entries daily flow rates and measurement capabilities?
Thanks!
Jennifer Cline, P.E.
City of Molalla
Public Works Director
O: 503.759.0218
F: 503.829.3676
From: Lee, Rob [mailto:roblee@BrwnCald.com]
Sent: Tuesday, November 25, 2014 12:14 AM
To: Jennifer Cline
Cc: Dan Huff
Subject: RE: Inflows June '13 to July '14
Jennifer,
Do you know if these are daily flow rates (e.g., averaged over a 24-hour period) or instantaneous flow rates? The 2.5x peaking factor between average and daily is pretty normal (actually pretty good) for a community of Molalla’s size in a Willamette Valley February, and the 8x between peaks in August vs February aren’t that far off either (normally we’d love to see around a 4x). However, it’s the flashy collection system responses at the peak of the storm that really are important.
Is the WWTP capable of monitoring on a 15-minute basis? That might save the City from having to install a flow meter or two right before the WWTP. On that note, while I know I’ve expressed some concern about budget, I do think it would be important for us to select flow meter locations so we can nail down the exact number of meters you should be proposed to Council on 12/10. How about a call after the Thanksgiving holiday?
Robert Lee
Brown and Caldwell
T 503.977.6625 | C 503.828.7542
From: Jennifer Cline [mailto:jcline@cityofmolalla.com]
Sent: Monday, November 24, 2014 4:35 PM
To: Lee, Rob
Cc: Dan Huff
Subject: Inflows June '13 to July '14
Hi Rob,
Here’s additional data we can include in Section 1.2 Background regarding inflows coming into the plant over the last year.
You can see where I/I is contributing to peak flows up to 6.6 MGD
Jennifer Cline, P.E.
City of Molalla
Public Works Director
O: 503.759.0218
F: 503.829.3676
