Lentic and Lotic

Lentic is an ecological adjective describing organisms or habitats situated in non-moving fresh water that includes ponds, swamps, bogs, lagoons, and lakes. The opposite is lotic, which includes moving fresh water as in a run, creek, brook, spring, stream, channel, or river.

Cairns

a mixed media word art composition that says "cairns" with three stacked pebbles to represent the letter A

The word cairn comes from Gaelic càrn, meaning heap of stones or rocky hill.

What is a spillway?

A spillway is a divergent water pathway controlling the release of water from a reservoir into a downstream area of a river. Water flows over a spillway during flood periods—when the reservoir cannot hold excess water. Wikipedia

What is effluent?

Effluent is water that flows from a wastewater treatment facility into a natural body of water. Wikipedia

What is Total Maximum Daily Load?

Total Daily Maximum Load, or TMDL, is the calculation of the maximum amount of a pollutant allowed to enter a waterbody so that the waterbody will meet and continue to meet water quality standards for that particular pollutant. US Environmental Protection Agency (EPA)