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#283733 - 02/13/17 03:59 AM Dam Overflow
CANOEDOGS Offline
Pooh-Bah

Registered: 02/03/07
Posts: 1853
Loc: MINNESOTA
i'm sure we have all seen about the dam overflow and just now I read that the roads are jammed by people fleeing town.
if anyone asks if a BOB is a silly thing to have ready show
them this.

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#283734 - 02/13/17 04:36 AM Re: Dam Overflow [Re: CANOEDOGS]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 7705
Loc: southern Cal
If you live downstream from a dam you should have a plan and a BOB. The path of a hugely destructive dam failure is just an easy bike ride from me:

https://en.wikipedia.org/wiki/St._Francis_Dam

Pictures of the destruction are very sobering....
_________________________
Geezer in Chief

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#283736 - 02/13/17 06:13 AM Re: Dam Overflow [Re: CANOEDOGS]
Bingley Offline
Veteran

Registered: 02/27/08
Posts: 1576
I'm downstream from a dam. How do I prep for this? It seems like perhaps I need to figure out whether my house will be flooded, and which roads will be flooded (so I can plan my escape). How would I do this? I know topographical maps exist, but I wouldn't know how to estimate flood trajectory and inundation level.


Edited by Bingley (02/13/17 06:37 AM)

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#283737 - 02/13/17 10:43 AM Re: Dam Overflow [Re: Bingley]
EMPnotImplyNuclear Offline
Enthusiast

Registered: 09/10/08
Posts: 382
Originally Posted By: Bingley
I'm downstream from a dam. How do I prep for this? It seems like perhaps I need to figure out whether my house will be flooded, and which roads will be flooded (so I can plan my escape). How would I do this? I know topographical maps exist, but I wouldn't know how to estimate flood trajectory and inundation level.

Hi,
you shouldn't need to do any flood estimations,
your local government, dam/city/county/state/country,
should have published inundation maps specific to dams,
there should also be some evacuation plans,
...
years back I checked and if I recall correctly
hazards.fema.gov
didn't have dam data
...
I watched the tv news report on the hole opening ,
two people hiking and called it in,
stayed to watch, and then for the interview,
...
I thought it was a good time to pack and review/check plans,
...
then later the hole is reported as 200 foot
...
I thought a good time to inquire about hotel reservations smile
and check road conditions with google and other sites
...
naturally the tv news just marveled at the spectacle,
until the evacuation was called no real thoughts of preparation were hinted at, only the potential for disaster , fear sells
...
after catching that on the news, I either read or heard about a resident new to the area returning a reverse 911 call to ask for driving directions to a hotel,
...
I thought whoa, I would never think of that ...
then a minute later I remembered I'm exausted and sleepy
but despite that , stop/think/observe/plan, it works
...
regarding road conditions, I checked for highway flooding for the first time last week, spent a good half hour trying to decide if the hazard report meant the highway was blocked or just the exit that was flooded,
and no I wasn't sleepy then

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#283738 - 02/13/17 12:26 PM Re: Dam Overflow [Re: CANOEDOGS]
Russ Offline
Geezer

Registered: 06/02/06
Posts: 5357
Loc: SOCAL
188,000 people evacuated and Oroville dam was expected to fail.
Interesting article, it reads like an ongoing situation summary. Apparently the dam had been expected to fail, possibly losing 30' (vertical) of spillway which would have put towns downstream underwater. However...
Quote:
...Water flow over spillway stopped

State officials say the water spilling over the Oroville Dam’s emergency spillway has stopped as the lake level dropped low enough.

At 8:45 p.m. the lake level fell below the lip of the auxiliary spillway for the first time since Saturday and “the flowing has stopped,”said Department of Water Resources spokesman Doug Carlson. ...
Read more here: http://www.sacbee.com/news/state/california/water-and-drought/article132332499.html

There's another good read at: http://www.sacbee.com/news/state/california/water-and-drought/article132356269.html


Edited by Russ (02/13/17 01:36 PM)
Edit Reason: Added link

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#283739 - 02/13/17 02:13 PM Re: Dam Overflow [Re: Bingley]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 7705
Loc: southern Cal
My local county has an official "hazards map" which lists and maps areas subject to severe earthquake shaking,liquifaction zones (also EQ related), 100 year and 500 year flood areas, regions subject to tsunami inundation, and similar goodies.

In most jurisdictions, I believe there is a requirement to inform prospective buyers if the land is within a 100 year flood zone
_________________________
Geezer in Chief

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#283742 - 02/13/17 03:04 PM Re: Dam Overflow [Re: CANOEDOGS]
Russ Offline
Geezer

Registered: 06/02/06
Posts: 5357
Loc: SOCAL
_________________________
Better is the Enemy of Good Enough.
Okay, what’s your point??

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#283745 - 02/13/17 06:45 PM Re: Dam Overflow [Re: CANOEDOGS]
wildman800 Offline
Carpal Tunnel

Registered: 11/09/06
Posts: 2846
Loc: La-USA
I'm coming across accounts that point that many if not most people were taken by surprise when immediate mandatory evacuation order was given. Apparently many folks put their family into the car and took off with what they were wearing, carrying, and whatever they had in their vehicle.

Anybody else picking up on this?
_________________________
QMC, USCG (Ret)
The best luck is what you make yourself!

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#283752 - 02/13/17 09:41 PM Re: Dam Overflow [Re: hikermor]
Mark_R Offline
Old Hand

Registered: 05/29/10
Posts: 863
Loc: Southern California
Originally Posted By: hikermor
My local county has an official "hazards map" which lists and maps areas subject to severe earthquake shaking,liquifaction zones (also EQ related), 100 year and 500 year flood areas, regions subject to tsunami inundation, and similar goodies.

In most jurisdictions, I believe there is a requirement to inform prospective buyers if the land is within a 100 year flood zone


One of the things I had to sign when buying my house was an acknowledgment of assessed hazards (earthquakes, fires, floods, aviation, etc.).
_________________________
Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane

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#283753 - 02/13/17 09:43 PM Re: Oroville Dam Overflow [Re: wildman800]
Teslinhiker Offline
Veteran

Registered: 12/14/09
Posts: 1418
Loc: Nothern Ontario
Originally Posted By: wildman800
I'm coming across accounts that point that many if not most people were taken by surprise when immediate mandatory evacuation order was given. Apparently many folks put their family into the car and took off with what they were wearing, carrying, and whatever they had in their vehicle.

Anybody else picking up on this?


Laat night, I watched a live Youtube feed that a person was re-streaming from a local TV news station (KRCR.)

Interesting to see events in real time and a the sharp contrast of how the news was being presented earlier today (lots of misinformation but that is perhaps another discussion later.)

During the live feed, they had a reporter who was on scene of a very busy gas station. It would come as no surprise to members here, that the people affected were not prepared in any way and were waiting for substantial amounts of time to fuel their vehicles before leaving the area.

_________________________
Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock

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