Impervious definition

Impervious. - means not allowing the passage of water through the surface of the ground or ground covering or a substantial reduction in the capacity for water to pass through the surface of the ground or ground covering.

Impervious means a material of sufficient thickness, density and composition that is impenetrable, or has a permeability of less than 1 X 10 7 cm/sec. to the Regulated Substance, and that will prevent the discharge to the lands, ground waters, or surface waters of the State of any Regulated Substance for a period of at least as long as the maximum anticipated time during which the Regulated Substance will be in contact with the material.

Impervious means nonporous, impenetrable, smooth, and washable.

Examples of Impervious in a sentence

• Such changes will only require an administrative amendment to the Concept Plan so long as the Impervious Cover limitations are met and there are no increases to the residential or commercial density of the Land or adverse impacts to traffic, utilities, stormwater discharges, or water quality.

• Such changes will only require an administrative amendment to the Concept Plan so long as the Impervious Cover requirements herein are met, there are no reductions in lot sizes or increases in the overall density of the Project, and no net reduction in required Parkland for the Project.

• If the development is a low-density development (less than fifteen (l5%) Impervious Cover), no structural water quality controls will be required.

• Developer may develop the Project with an Impervious Cover Percentage that does not exceed thirty-five percent (35%) over the entire Project.

More Definitions of Impervious

Impervious means a material having permeability not greater than 1x10-7 cm per second when subjected to a head of 0.305 m of water where permeability is not affected by the liquid it is meant to contain.

Impervious means materials and/or construction that prevents or greatly reduces the infiltration of water into the soil.

Impervious means that which will not allow entrance or passage, such as an airtight plastic container that will not allow the entrance of moisture or vermin.

Impervious means a hard surface area (e.g., driveway or rooftop) that prevents or impedes the entry of water into the soil, thus causing water to run off the surface in greater quantities or at an increased rate of flow, as defined in Section11.02.010.

Impervious means a natural material that demonstrates a hydraulic conductivity of 10-6 cm/s or less as determined in situ or of 10-7cm/s or less as determined in a laboratory from a representative disturbed sample, or a synthetic membrane liner or barrier appropriately selected to control the migration of specific fluids;

Impervious means not allowing fluid to pass through.

Impervious means the ability of a base surface underneath Containers or tank systems, free of cracks, gaps or areas of bare earth, to prevent and inhibit the migration of spilled or leaked material until the material is detected and removed; or the ability for a cover of a Container to prevent the infiltration of precipitation.