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Recharge
The replenishment of ground water through the infiltration of rainfall, other surface waters, or land application of water or treated wastewater.
Retention
The prevention of direct discharge of stormwater runoff into receiving waters by temporary containment in a pond or depression; examples include systems which discharge by percolation to ground water, exfiltration, and/or evaporation process and which generally have residence times of less than three days.
Retention Time
The length of time that water, nutrients, or other chemical substances remain in a lake, impoundment or standing pool. .
Riffle
Shallow section of a stream or river with rapid current and a surface broken by gravel, rubble, or boulders.
Riparian
Pertaining to anything connected with or immediately adjacent to the banks of a stream or other body of water.
Riparian Forest Buffer
An area of trees, usually accompanied by shrubs and other vegetation, adjacent to a body of water and managed to maintain the integrity of stream channels and shorelines to 1) reduce the impact of upland sources of pollution by trapping, filtering, and converting sediments, nutrients, and other chemicals, and 2) supply food, cover, and thermal protection to fish and other wildlife.
Riprap
Stones of varying size used to dissipate energy or stabilize a soil surface.
Runoff
Surface water (usually rainfall) that is not evaporated, transpired, used, or infiltrated into the ground water system, and thus flows over land to a surface water body.
