Author: Mallory Griffith
Contact: Mgriff2@pdx.edu
In Oregon, and the Greater Pacific Northwest, there are many
dams that have been constructed for various reasons, some being, to create
energy, allows better flood control or irrigation. Flood control in Oregon is
very vital, floods have been known to wipeout towns and cause chaos throughout
the state. Floods damage housing, soil, roads and many other expensive assets
that a town may have. When a dam is put in place to protect from flooding, it
can be expensive but look at all of the assets and land it is protecting.
Another important reason humans use dams, is for drinking water. Dams are often
put in place to create an area for safe drinking water and in the summer this
water is used in case of drought, and in the winter the water is stored up.
Having a surplus of water is a huge benefit that comes from a dam. Another
important reason for a dam would be to create more usable land and make profit
off of it. If the dam is in place it holds water back allowing for more taxable
land to be built on. Once that land is being used as real estate it is gaining
a profit that it would not have otherwise. These are the human benefits of
having a dam in place.
Now, many years later, dams are
beginning to give way and become a hazard if something is not changed. There
are two main ecosystems and the cost of removal we have to think about when
proposing to remove a dam. Dam removal
is beginning to get more attention because of the cons they provide to
ecosystems and potentially to humans. Dams that were built in the 1900’s are
old, and have wear and tear from supporting so much water over the years. It is
dangerous to have a dam that could break or crumble because it would cause
flooding and it would destroy the ecosystems all along the river. Yes, if you
remove a dam it will still cause a large disturbance to ecosystems along the
river, but humans would be prepared to restore and protect what already exists.
Also, dams prevent the growth of salmon and other fish populations because the
fish can only go so far before the dam cuts them off. In Oregon, people take
their salmon very seriously, and it is important for the community to be
protecting the growth of the salmon population.
Resources:
Photo credit: Salmon leaping at Willamette Falls Image ID: fish6624, NOAA's Historic Fisheries Collection Location: Oregon, Oregon City Photo Date: 1950 June 27
Bergkamp, G., McCartney, M.,
Dugan, P., McNeely, J., & Acreman, M. (2000). Dams, Ecosystem Functions and
Environmental Restoration.
ESA 2014. Dispatches. Frontiers in
Ecology and the Environment 12: 428–432. Retrieved September 24, 2014,
From http://dx.doi.org/10.1890/1540-9295-12.8.428
Lester, L. (n.d.). River Flow
By Design: Environmental Flows Support Ecosystem Services In Rivers Natural And
Novel. Retrieved September 24, 2014, from
http://www.esa.org/esablog/research/river-flow-by-design-environmental-flows-support-ecosystem-services-in-rivers-natural-and-novel/
Nijhuis,
M. (2014, August 26). World's Largest Dam Removal Unleashes U.S. River After
Century of Electric Production. Retrieved October 20, 2014, from http://news.nationalgeographic.com/news/2014/08/140826-elwha-river-dam-removal-salmon-science-olympic/
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