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Largest Dam Removal in History
06-26-2016, 04:52 PM #1
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
River revives, fish (Salmon) return and thrive.

Quote:What species of fish have been affected?

We've seen a recent increase in the number of young Chinook salmon. Coho salmon have also seen a spike, as have chum salmon, bull trout, and steelhead. Eulachon also showed up in the estuary for the first time in a long time, and in abundance. (These small fish are so oily they can be lit on fire, and they are an important food source for many animals.)

Have the fish resulted in other changes to the environment?

Yes. There is new habitat for Dungeness crabs, clams, and other species. For birds it's been twofold. The new delta has formed a resting area for gulls. And the boom in fish has led to a fantasia of birds feeding on them.

We're also seeing a beautiful beach develop from all the new sediment coming down the river. The shoreline has gone from rough cobbles that looked like a lunar landscape to a fine sand that rivals any beach in the Northwest.

http://news.nationalgeographic.com/2016/...29609550=1



06-26-2016, 05:35 PM #2
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,493 Threads:1,442 Joined:Feb 2011
clap.gif Great news. There has been a number of mistakes made over the years, with most efforts like this causing more harm than good and disturbing ecosystems in some cases, beyond repair.
Cool time lapse clips.

wonder.gif
06-26-2016, 05:35 PM #3
Octo Mother Superior
Posts:43,253 Threads:1,479 Joined:Feb 2011
Very cool time lapse videos cheers.gif

I guess fish ladders aren't as effective as I hoped sad2.gif
06-26-2016, 05:41 PM #4
Kreeper Griobhtha
Posts:10,821 Threads:652 Joined:Feb 2011
clap.gif

Politicians hide themselves away
They only started the war
Why should they go out to fight?
They leave that role to poor
06-26-2016, 05:53 PM #5
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
(06-26-2016, 05:35 PM)Octo Wrote:  Very cool time lapse videos cheers.gif

I guess fish ladders aren't as effective as I hoped sad2.gif

What fish ladders? Oh, you assume there were fish ladders at those dams, if so, yeah, they seemed to not work.
06-26-2016, 07:01 PM #6
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
Old vid, but we get a good idea as to how fast fish and the environment recover. It seems these dams had no fish ladders. sad2.gif

06-26-2016, 07:32 PM #7
Octo Mother Superior
Posts:43,253 Threads:1,479 Joined:Feb 2011
There's no fish ladder by our local hydro power-plant 13.gif
06-26-2016, 07:52 PM #8
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,493 Threads:1,442 Joined:Feb 2011
damned.gif I just naturally assumed there would be?

wonder.gif
06-26-2016, 07:58 PM #9
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
Me too, I though fish ladders were a given. wtf2.gif
06-27-2016, 04:29 PM #10
klonk Incognito Anonymous
 
I wanted to 5 star this but I couldn't.
06-27-2016, 04:45 PM #11
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
This was suppose to be a feel good thread, but when we peel away the veil to reveal the truth (no fish ladders), there is some form of negligence and/or destruction happening in the environment.
06-28-2016, 04:21 PM #12
Kreeper Griobhtha
Posts:10,821 Threads:652 Joined:Feb 2011
Fish ladders only work for fish that are 15 inches or longer.

Shorter fish can't reach the the 12 inch space between rungs.

İmage

Politicians hide themselves away
They only started the war
Why should they go out to fight?
They leave that role to poor
06-28-2016, 04:59 PM #13
Octo Mother Superior
Posts:43,253 Threads:1,479 Joined:Feb 2011
(06-27-2016, 04:45 PM)UniqueStranger Wrote:  This was suppose to be a feel good thread, but when we peel away the veil to reveal the truth (no fish ladders), there is some form of negligence and/or destruction happening in the environment.

Civilization

yup.gif

The Colorado river is a dam good example;

The average flow rate of the Colorado at the northernmost point of the Mexico–United States border (NIB, or Northerly International Boundary) is about 2,060 cubic feet per second (58 m3/s), 1.49 million acre feet (1.84 km3) per year – less than a 10th of the natural flow – due to upstream water use.[68] Below here, all of the remaining flow is diverted to irrigate the Mexicali Valley, leaving a dry riverbed from Morelos Dam to the sea that is supplemented by intermittent flows of irrigation drainage water.

https://en.wikipedia.org/wiki/Colorado_River

So the water arriving in Mexico is a 10th of what it was and of poor quality.
The hijacking of the Colorado river had a devastating effect on people living already living there.

I don't think it's very surprising the Mexicans come up north to make a better life for themselves. I don't say it's right, just not surprising.
06-28-2016, 05:10 PM #14
UniqueStranger Art in my heart
Posts:15,142 Threads:428 Joined:Jun 2012
(06-28-2016, 04:59 PM)Octo Wrote:  
(06-27-2016, 04:45 PM)UniqueStranger Wrote:  This was suppose to be a feel good thread, but when we peel away the veil to reveal the truth (no fish ladders), there is some form of negligence and/or destruction happening in the environment.

Civilization

yup.gif

The Colorado river is a dam good example;

The average flow rate of the Colorado at the northernmost point of the Mexico–United States border (NIB, or Northerly International Boundary) is about 2,060 cubic feet per second (58 m3/s), 1.49 million acre feet (1.84 km3) per year – less than a 10th of the natural flow – due to upstream water use.[68] Below here, all of the remaining flow is diverted to irrigate the Mexicali Valley, leaving a dry riverbed from Morelos Dam to the sea that is supplemented by intermittent flows of irrigation drainage water.

https://en.wikipedia.org/wiki/Colorado_River

So the water arriving in Mexico is a 10th of what it was and of poor quality.
The hijacking of the Colorado river had a devastating effect on people living already living there.

I don't think it's very surprising the Mexicans come up north to make a better life for themselves. I don't say it's right, just not surprising.

Civilization and a non-caring government...

I am sure I can find many examples along the same and other lines of destruction and negative environmental impact here in Canada...esp. mercury poisoning. sad2.gif

Well, I still feel a bit better that dams are being dismantled to revert environments back to the way they were - even here in Canada, even if MOST are dismantled without proper assessment before and after.

Quote:Selection of the preferred alternative
The results of these consultations, combined with the detailed environmental impact assessments indicated that complete removal of the Finlayson dam was the preferred solution, provided that issues associated with sediment release and habitat restoration could be dealt with. It had the advantage that the river system would be returned to a cold water environment conducive to brook trout, eliminated safety concerns associated with the existing dam and eliminated future operations and maintenance costs. Although it was not originally evaluated to be the cheapest option in terms of direct cost (reference Table 3), it was deemed to provide the greatest overall benefit when intangible issues such as the restoration of the natural river habitat were accounted for.

http://www.waterpowermagazine.com/featur...ayson-dam/
07-24-2016, 11:23 AM #15
Octo Mother Superior
Posts:43,253 Threads:1,479 Joined:Feb 2011
I was just reading about beavers and had to bump this thread again.

Evidently not all damn dams are detrimental to fish.

Effects on fish

Beaver ponds have been shown to have a beneficial effect on trout and salmon populations, in fact many authors believe that the decline of salmonid fishes is related to the decline in beaver populations. A study of small streams in Sweden found that brown trout in beaver ponds were larger than those in riffle sections, and that beaver ponds provide habitat for larger trout in small streams during periods of drought.[63] These findings are similar to several studies of beaver effects on fish in North America. Brook trout, coho and sockeye salmon were significantly larger in beaver ponds than those in un-impounded stream sections in Colorado and Alaska.[64][65] In addition, research in the Stillaguamish River basin in Washington state, found that extensive loss of beaver ponds resulted in an 89% reduction in coho salmon smolt summer production and an almost equally detrimental 86% reduction in critical winter habitat carrying capacity.[66] Migration of adult Atlantic salmon (Salmo salar) may be limited by beaver dams during periods of low stream flows, but the presence of juveniles upstream from the dams suggests that the dams are penetrated by parr.[67] Downstream migration of Atlantic salmon smolts was similarly unaffected by beaver dams, even in periods of low flows.[67] Two year old Atlantic salmon parr in beaver ponds in eastern Canada showed faster summer growth in length and mass and were in better condition than parr upstream or downstream from the pond.[68] The importance of winter habitat to salmonids afforded by beaver ponds may be especially important (and underappreciated) in streams without deep pools or where ice cover makes contact with the bottom of shallow streams.[67] A 2003 study showed that Atlantic salmon and Sea trout (S. trutta morpha trutta) spawning in the Numedalslågen River and 51 of its tributaries in southeastern Norway were unhindered by beaver.[69] In Norway, beaver dams are considered beneficial for Brown and Sea Trout populations (these are potamodromous and anadromous forms of the same species). There, beaver ponds produce increased food for young fish and provide refugia for large adults heading upstream to spawn.

https://en.wikipedia.org/wiki/Eurasian_b...ts_on_fish

Sorry about the wall of text



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