Storm water attenuation definition

Storm water attenuation means the process by which peak flows from precipitation are reduced and runoff velocities are slowed as a result of passing through a surface water body.
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Storm water attenuation means the process by which peak flows from precipitation are reduced and runoff velocities are slowed as a result of passing through a surface water body. "Surface waters of the state" includes lakes, rivers, ponds, streams, inland waters, saltwaters, wetlands and all other surface waters and water courses within the jurisdiction of the state of Washington.
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Related to Storm water attenuation

  • Storm water means storm water runoff, snow melt runoff, and surface runoff and drainage.

  • Natural attenuation means a variety of physical, chemical or biological processes that, under favorable conditions, act without hu- man intervention to reduce the mass, toxicity, mobility, volume, or concentration of hazardous substances in the environment. These in situ processes include: Natural biodegradation; dispersion; dilution; sorption; volatilization; and, chemical or biological stabilization, transformation, or destruction of hazardous substances. See WAC 173-340-370(7) for a description of the expected role of natural at- tenuation in site cleanup. A cleanup action that includes natural at- tenuation and conforms to the expectation in WAC 173-340-370(7) can be considered an active remedial measure.

  • Stormwater runoff means water flow on the surface of the ground or in storm sewers, resulting from precipitation.

  • water meter means any apparatus for measuring or showing the volume of water supplied to, or of effluent discharged from any premises;

  • Stormwater management planning area means the geographic area for which a stormwater management planning agency is authorized to prepare stormwater management plans, or a specific portion of that area identified in a stormwater management plan prepared by that agency.