From: Jennifer Cline
Sent: Mon Feb 22 10:29:56 2016
To: Gerald Fisher
Subject: Re: Stoneplace Apts - Storm Calculations
Importance: Normal
Hi Gerald,
Will you please send your stormwater comments you have written below to Jeff. We can look at the sewer line on easement tomorrow. Hopefully Multitech will drop off the other plans today as they mentioned on Friday.
Thanks,
Jenn
Sent from my iPhone
On Feb 17, 2016, at 10:46 AM, Gerald Fisher <geraldf@pdgnw.com> wrote:
If you look at Table 1a Column 5 they will exceed the volume in the first 5 minutes of the storm and overtop.
Regards,
Gerald Fisher, PE | Senior Project Manager
PROJECT DELIVERY GROUP, LLC | 3150 22nd Street SE; Salem, OR 97302
www.PDGNW.com | 503-364-4004 (O) | 503-679-9237 (C)
** CONFIDENTIALITY NOTICE: The information contained in this email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient and have received this communication in error, please contact the sender by reply email and destroy all copies of the original message. Thank you.
From: Jennifer Cline [mailto:jcline@cityofmolalla.com]
Sent: Wednesday, February 17, 2016 10:45 AM
To: Gerald Fisher <geraldf@pdgnw.com>
Subject: RE: Stoneplace Apts - Storm Calculations
Ok, I want to see what they submit tomorrow and compare. They may need to update their stormwater report if they made significant changes to the design.
Jennifer Cline, P.E. | Public Works Director
Licensed in OR, WA
117 N Molalla Ave. | PO Box 248 * |Molalla, OR 97038
O: 503.759.0218 | F: 503.829.3676
From: Gerald Fisher [mailto:geraldf@pdgnw.com]
Sent: Wednesday, February 17, 2016 10:42 AM
To: Jennifer Cline (Molalla) <jcline@cityofmolalla.com>
Subject: Stoneplace Apts - Storm Calculations
Importance: High
Hi Jen,
Need to ask Multitech to give you a timed routing report for the storm system. They have all of the orifices set at the same size 5.62 inches. The problem with that is that all of the basins A through E are higher than the overflow at the flow control manhole. So, the basin will fill up with about 2,808 CF of water if you include the pipes and basin F and then everything above that will simply go over the overflow. They need to detain 10,438 CF of storm water and meter it out at a rate of 0.82 CFS. In order to do that, they will need to reduce the orifice sizes in basin’s A through E to slow the release of the water from those basins and allow the water to drain at 0.82 CFS without overtopping the overflow which has an elevation of 351.50.
Basin E = 352.25
Basin D = 353.00
Basin C = 353.75
Basin B = 355.00
Basin A = 356.50
Regards,
Gerald Fisher, PE | Senior Project Manager
PROJECT DELIVERY GROUP, LLC | 3150 22nd Street SE; Salem, OR 97302
www.PDGNW.com | 503-364-4004 (O) | 503-679-9237 (C)
** CONFIDENTIALITY NOTICE: The information contained in this email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient and have received this communication in error, please contact the sender by reply email and destroy all copies of the original message. Thank you.