Stormwater Infiltration in the Highway Environment: Guidance Manual (2019) / Chapter Skim
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Pages 111-118
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From page 111... ...
111 The following glossary contains definitions of the key terms as used in the context of this Guidance Manual. Anisotropy: A soil structure property defined as the ratio between horizontal hydraulic conductivity and vertical hydraulic conductivity.
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From page 112... ...
112 Stormwater Infiltration in the Highway Environment: Guidance Manual may be intentional, as in the preparation of a site for construction, or incidental, as in the movement of machinery or foot traffic over an area. Confining Layer: A layer of low permeability soil or rock that limits the vertical movement of water.
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From page 113... ...
Glossary of Key Terms 113 efficiency, percentage of volume reduction, and effluent pollutant concentration. See Performance and Efficiency for complementary definitions.
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From page 114... ...
114 Stormwater Infiltration in the Highway Environment: Guidance Manual Groundwater Recharge: The process by which surface water infiltrates into permeable soil and ultimately contributes additional water volume to groundwater sources. Head: In hydraulics, energy represented as a difference in elevation.
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From page 115... ...
Glossary of Key Terms 115 Interflow (aka shallow interflow) : The flow of water through the upper soil zones into a stream.
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From page 116... ...
116 Stormwater Infiltration in the Highway Environment: Guidance Manual Outlet Control: A design approach for bioretention BMPs in which the flow through the soil media bed is primarily controlled by an outlet control structure affixed to the underdrains of the system rather than limited by the hydraulic conductivity of the bioretention soil media. Overland Flow: Flow of water across the land surface in a downgradient direction.
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From page 117... ...
Glossary of Key Terms 117 construction impacts, elevated sediment loading, contaminant spills, extreme storm events, lack of maintenance, change in tributary area characteristics, and change in design goals. Retrofit: A type of project that principally involves retrofitting a roadway with a stormwater BMP for the purpose of providing treatment of existing paved surfaces.
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From page 118... ...
118 Stormwater Infiltration in the Highway Environment: Guidance Manual Total Maximum Daily Load (TMDL) : The calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards and an allocation of that load among the various sources of that pollutant.
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