"file:///C:From: Jennifer Cline
Sent: Fri Jun 05 14:59:12 2015
To: Mark Strandberg
Cc: Phillip Bender; Jason Clifford; Dan Huff
Subject: RE: Non-continuous Irrigation
Importance: Normal
See my edit below
Jennifer Cline, P.E.
City of Molalla
Public Works Director
O: 503.759.0218
F: 503.829.3676
From: Jennifer Cline [mailto:jcline@cityofmolalla.com]
Sent: Friday, June 05, 2015 2:57 PM
To: Mark Strandberg
Cc: Phillip Bender; Jason Clifford; Dan Huff
Subject: Non-continuous Irrigation
Hi Mark,
Here’s the answer.
It takes 4-6 hours to charge the line and set the big gun. Once the Big Gun is set, we then could only irrigate for 18 hours, which equates close to 300,000 MGD. Within that 22-24 hour period of time the plant will take on approximately 1 MGD. This process will not remove enough effluent to keep up with the influent entering the system. In addition, charging, draining and recharging the system regularly is hard on the pumps and line. However, not doing anything also risks dike failure or overtopping of the Lagoons.
One lagoon will gain a foot of elevation for every 3.9 MDG. Lagoon 1 is approx.. at 12’ and Lagoon 2 was at 12’ yesterday, which is considered design capacity. By next Monday they will gain an additional 1’ or more between the two.
It could be feasible to check the sight 3-4 times in a 24 hour period with help of Coleman. Historically we have not had a ponding issue utilizing the big gun. This has only been a challenge when the hand (or static) lines have been in use.
Let me know if you need any clarification.
Regards,
Jennifer Cline, P.E.
Public Works Director
117 N Molalla Ave.
PO Box 248 *
Molalla, OR 97038
O: 503.759.0218
F: 503.829.3676
"