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Old 08-11-2019, 11:44 AM   #1
Don G Baldi
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Default Portland Flushed Again

Portland city officials say an estimated 60,000 gallons of storm water and sewage overflowed into the Willamette River following weekend heavy rains.

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Old 08-11-2019, 12:59 PM   #2
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Default Re: Portland Flushed Again

I'm surprised! No I'm not.
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Old 08-11-2019, 01:14 PM   #3
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Default Re: Portland Flushed Again

Weekend rains? HUH?
Portland Maine?
So brown trout season is reopened in the Willy?
ARRRRGH.
Getting to be a too often occurrence these last few years.
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Old 08-11-2019, 02:54 PM   #4
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Default Re: Portland Flushed Again

I'm very surprised the EPA isn't throwing major fines for this every time it happens......what happened to the 10 year.......multi million dollar project to create a holding area (tunnel) under the city for sewage until the city could process it......it's a joke...what a waste....Portland is a joke.....
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Old 08-11-2019, 02:59 PM   #5
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Default Re: Portland Flushed Again

Quote:
Originally Posted by nikkidog View Post
....Portland is a joke.....
It has been for going on 40 years now.
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Old 08-11-2019, 03:38 PM   #6
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Default Re: Portland Flushed Again

Curious what the Willamette water temperature is currently.
Pea-U.
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Old 08-11-2019, 04:14 PM   #7
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It has been for going on 40 years now.
Yep.....
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Old 08-11-2019, 06:21 PM   #8
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Default Re: Portland Flushed Again

Perfect for warm water species.
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Old 08-12-2019, 06:12 AM   #9
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Default Re: Portland Flushed Again

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Originally Posted by nikkidog View Post
I'm very surprised the EPA isn't throwing major fines for this every time it happens......what happened to the 10 year.......multi million dollar project to create a holding area (tunnel) under the city for sewage until the city could process it......it's a joke...what a waste....Portland is a joke.....
About .8" fell in about an hour Saturday evening. The system couldn't handle that volume in that time frame.
From what I've read, they spent something like 1.5 BILLION dollars to reduce spills by 95%, and it would have taken another 1.5 billion to get the rest.
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Old 08-12-2019, 11:07 AM   #10
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Default Re: Portland Flushed Again

So how many of the "we hate Portland" fan club members are paying over $100 a month for water and sewer?


https://www.oregonlive.com/portland/...bill_in_1.html
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Old 08-12-2019, 11:52 AM   #11
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Default Re: Portland Flushed Again

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Originally Posted by CKthumper View Post
About .8" fell in about an hour Saturday evening. The system couldn't handle that volume in that time frame.
What was the total rainfall for the storm?

The NOAA Isopluvials from 1973 show the 6 hr precipitation for a 2-year storm event at 1.2" for Portland. I don't work in Portland, but I believe they should be designing for 24-hr runoff from a 50 or 100 year event, which is about 4.2" and 4.6" respectively per NOAA.

0.8" in one hour is a lot for Portland. The ODOT Hydraulics manual has that level of intensity as a 50-year event, and a 100-year event is still less than 1" in an hour.

This is from the 2016 City of Portland Stormwater Management Manual:

"For volume based facilities, Portland shall continue to size wet basins using 0.83 inches of rainfall over 24 hours (NRCS Type 1A rainfall distribution), with a Vb/Vr ratio of 2."

60,000 gal is not that bad. It's about 0.18 acre-ft, a little over 2" worth of water sitting on one acre, and only about 20% of it is estimated to have been sewage.
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Old 08-12-2019, 01:54 PM   #12
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Default Re: Portland Flushed Again

Not to minimize the Portland spill but Seattle's Metro system has a far more serious spill history:

2009 - 1.5 million gallons at their Renton plant and 10 million at West Point (Seattle).

2017 - A major flooding with roughly $25MM in damages to the West Point plant and approximately 30MM gallons of untreated sewage released.

2019 - July spill at West Point of 3MM gallons.

One serious issue is the co-mingling of storm water (gray water) with sewage (black water) creating the risk of storms overwhelming the treatment plants.
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Old 08-12-2019, 02:11 PM   #13
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Default Re: Portland Flushed Again

Quote:
Originally Posted by freespool View Post
So how many of the "we hate Portland" fan club members are paying over $100 a month for water and sewer?


https://www.oregonlive.com/portland/...bill_in_1.html
I would be your Huckleberry, $122 or so a month. We also have a system that doesn't overflow in high rain events.
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Old 08-12-2019, 02:27 PM   #14
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Summer months are a time to drain over flow, primary and secondary treatment clarifiers and reposition the mechanical systems needed to preform during the winter flood periods when tanks are not easily drained . conversely if sudden rain events happen when they are least likely(aug) a short fall in treatment may occur. Just be glade you don't have to climb down into the underbelly to fix it.
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Old 08-12-2019, 03:37 PM   #15
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Originally Posted by Rank Amateur View Post
I would be your Huckleberry, $122 or so a month. We also have a system that doesn't overflow in high rain events.
Good for you.
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Old 08-14-2019, 05:15 AM   #16
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Default Re: Portland Flushed Again

That storm was a total freak though. That was NOT a normal storm. It dropped a LOT of water in a very short period of time. It was bad enough that it THRASHED the ditches up on TOP of Skyline and closed Newberry (road currently being used in place of Cornelius Pass). There are few water systems designed to handle that kind of deluge.
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