Impervious areas definition

Impervious areas means any exterior surface which does not allow rain water to pass through it into the soil.
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Impervious areas means areas which have no or limited ability to transmit fluids. Impervious areas occur where the soil surface is sealed eliminating rainwater infiltration and natural groundwater recharge. They consist mainly of artificial structures such as pavements, rooftops, sidewalks, roads, and parking lots covered by materials such as asphalt, concrete, brick, and stone. Soils compacted by urban development are also highly impervious.
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Impervious areas means that hard surface area which either prevents or retards the entry of water into the soil mantle and/or causes water to run off the surface in greater quantities or at an increased rate of flow from that present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam or other surfaces which similarly impede the natural infiltration of surface and stormwater runoff. Open, uncovered retention/detention facilities shall not be considered as impervious surfaces for the purposes of this Chapter. (See also "New Impervious Surface.")
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Examples of Impervious areas in a sentence

  • Impervious areas (both treated and untreated) are calculated by summing the impervious area for all tributary land uses.

  • Criteria for application of this method include: • Impervious areas are present in tributary watersheds • Varying land uses across tributary watersheds • Treatment BMPs are present in tributary areas Table 1.

  • Impervious areas for the future southbound right-turn lanes will be provided by other engineering firms in coordination with the BOARD.


More Definitions of Impervious areas

Impervious areas means that hard surface area which either prevents or retards the entry of water into the soil mantle and/or causes water to run off the surface in greater quantities or at an increased rate of flow from that present under natural conditions prior to development. Common impervious surfaces include,
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Impervious areas means the sum of the following:
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Related to Impervious areas

  • Impervious area means any surface that does not allow stormwater to infiltrate into the ground.

  • Impervious surface means a surface that has been covered with a layer of material so that it is highly resistant to infiltration by water.

  • Pervious surface means an area that releases as runoff a small portion of the precipitation that falls on it. Lawns, gardens, parks, forests or other similar vegetated areas are examples of surfaces that typically are pervious.

  • Geologically hazardous areas means areas that because of their susceptibility to erosion, sliding, earthquake, or other geological events, are not suited to the siting of commercial, residential, or industrial development consistent with public health or safety concerns.

  • Common Areas is defined as all areas and facilities outside the Premises and within the exterior boundary line of the Project and interior utility raceways and installations within the Unit that are provided and designated by the Lessor from time to time for the general non-exclusive use of Lessor, Lessee and other tenants of the Project and their respective employees, suppliers, shippers, customers, contractors and invitees, including parking areas, loading and unloading areas, trash areas, roadways, walkways, driveways and landscaped areas.