Impoundments

Satellite images reveal that farmers are extracting surface water directly from watercourses and small impoundments in the headwaters of the Tapajos and Xingu watersheds.

For a good 150 years, impoundments created by dams choked off spawning habitat.

In December 2019, EPA signed a proposal to establish a federal permitting program for the disposal of CCR in surface impoundments and landfills.

The EPA has also been in discussions with about 20 states, which represent approximately 70% of surface impoundments.

The draft rules do not address coal ash contamination that has seeped from the unlined impoundments into the groundwater and drinking water; the Coal Ash Management Act regulates the groundwater impacts.

As the impoundments fail, a " domino effect" may be created, with a remarkable growth in the volume of the flowing mass, which takes up the debris in the stream channel.

Coincidence Extreme flood events often result from coincidence such as unusually intense, warm rainfall melting heavy snow pack, producing channel obstructions from floating ice, and releasing small impoundments like beaver dams.

Culverted fills may be converted to impoundments if the culverts become blocked by debris, and flow may be diverted along streets.

Many of the run-of-the-river dams on the Missouri (marked in yellow) form very small impoundments which may or may not have been given names; those unnamed are left blank.

Other protective legislation was passed, as well, but enforcement remained difficult. citation On both sides of the Canada–United States border, the proliferation of dams and impoundments have multiplied, necessitating more regulatory efforts.