A system of pipe and/or pervious material along the downstream toe of a dam used to collect seepage from the foundation and embankment and convey it […]

An electromagnetic device used to change the voltage of AC electricity.

At dams and places where it is not practical to install a fish ladder, a trap and haul operation can be used to move fish upstream […]

A rack or screen of parallel bars installed at an intake to prevent debris from entering a canal or turbine.

The extent to which water has become clouded as a result of suspended sediments.

Categories of waters defined by states or tribes in their water quality standards that are based on the water’s suitability for different uses such as irrigation, […]

Lands including swamps. marshes, bogs, and similar areas such as wet meadows, river overflows, mud flats, and natural ponds. An area characterized by periodic inundation or […]

White-nose syndrome (WNS) is the fungal disease killing bats in North America. Research indicates the fungus that causes WNS, Pseudogymnoascus destructans, is likely exotic, introduced from Europe. […]

Adjustable vanes that control the flow of water to a turbine.