Recharge Water that infiltrates the ground and reaches the saturated zone. Runoff Excess rainwater or snowmelt that is transported to streams by overland flow, tile drains, or ground water. Sediment Particles, derived from rocks or biological materials, that have been transported by a fluid or other natural process and are suspended or settled in water. Species Populations of organisms that may interbreed and produce fertile offspring having similar structure, habits, and functions. Streamflow A type of channel flow, applied to that part of surface runoff in a stream whether or not it is affected by diversion or regulation.
Stream reach A continuous part of a stream between two specified points.
An open body of water, such as a lake, river, or stream. It is associated with the material retained on a 0.45-micrometer filter. A stable, easily detected substance or a radioisotope added to a material to follow the location of the substance in the environment or to detect any physical or chemical changes it undergoes. VOCs include components of gasoline, fuel oils, and lubricants, as well as organic solvents, fumigants, some inert ingredients in pesticides, and some by-products of chlorine disinfection. Watershed See Drainage basin.