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A dam produces negative effects that continue down the watershed. The most important negative effects are the reduction of spring flooding, which damages wetlands, and the retention of sediment, which leads to the loss of deltaic wetlands. [4] River ecosystems are prime examples of lotic ecosystems.
River engineering also handles sediment and erosion control, which can be a threat to humankind by destroying infrastructure, hindering water supply and causing major river cutoffs. River training structures will help to modify the hydraulic flow and the sediment response of a river. [5] Miyagase Dam in Japan
In India, barrages control all of the tributaries to the Ganges and divert roughly 60 percent of river flow to irrigation [6] reduced fishing opportunities. The Indus River in Pakistan faces scarcity due to the over-extraction of water for agriculture. The Indus is inhabited by 25 amphibian species and 147 fish species, of which 22 are found ...
Along the river between Bellevue and Clinton, Iowa, for example, forest cover dropped nearly 18% between 2010 and 2020, said Nathan De Jager, who researches the upper river’s floodplain forests ...
Since dammed rivers store nutrients during their lifespan, it can be expected that when a dam is removed, these legacy nutrients are remobilized causing downstream ecosystems' eutrophication and probable loss of biodiversity, thereby achieving the opposite effect desired by the river restoration action at dam dismissal.
Eutrophication is an increase in the concentration of chemical nutrients in an ecosystem to an extent that increases the primary productivity of the ecosystem. Subsequent negative environmental effects such as anoxia (oxygen depletion) and severe reductions in water quality may occur. [1]: 131 This can harm fish and other animal populations.
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 ...
Removal of the Marmot Dam, Sandy River, Oregon. Dam removal is the process of demolishing a dam, returning water flow to the river [1]. Arguments for dam removal consider whether their negative effects outweigh their benefits. The benefits of dams include hydropower production, flood control, irrigation, and navigation.