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The flushing flow method involves partially or completely emptying the reservoir behind a dam to erode the sediment stored on the bottom and transport it downstream. [7] [6] Flushing flows aim to restore natural water and sediment fluxes in the river downstream of the dam, however the flushing flow method is less costly compared to removing dams or constructing bypass tunnels.
The effects of cold air damming east of the Cascades in Washington are strengthened by the bowl or basin-like topography of Eastern Washington. Cold Arctic air flowing south from British Columbia through the Okanogan River valley fills the basin, blocked to the south by the Blue Mountains .
Another important factor triggering the landslide is earthquakes. When landslide occurs near the river, it can block the river causing a damming effect. Damming could also occur due to rock-slides. [1] Such dams are unstable and can cause flooding if not breached in controlled manner.
The construction of CVP dams on the two rivers and many of their major tributaries—namely Friant Dam and Shasta Dam—mostly ended the once-bountiful Central Valley salmon run. From north to south, the Sacramento upriver of Shasta Dam, the American upriver of Folsom Dam, the Stanislaus upriver of New Melones Dam, and the San Joaquin upriver ...
In 2013, flow devices were installed along the Rouge River, to prevent beaver dams from flooding the river. Prior to their installation, beavers whose dams caused the river to flood were trapped. [88] In a 2017 TRCA report on local occurrences of fauna in Greater Toronto, beavers were given a score of L4. The score was given to species whose ...
Between 6 and 10 September 2003, a GLOF occurred from Grasshopper Glacier in the Wind River Mountains, Wyoming. A proglacial lake at the head of the glacier burst through a glacial dam, and water from the lake carved a trench down the center of the glacier for more than 0.8 kilometres (0.5 mi). An estimated 2,460,000 cubic metres (650,000,000 ...
These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ...
The Sanmenxia reservoir is part of a larger man-made project of hydroelectric dams called the Three Gorge Project [12] In 1998, uncertain calculations and heavy sediment greatly affected the reservoir's ability to fulfill its flood-control function properly [13] This also reduces the downstream river water quality.