Impervious Surfaces. Surfaces that are covered by asphalt, concrete, roofs, or any other surface that does not allow water to percolate into the soil. Roads and parking lots with soil or gravel surfaces are not considered impervious surfaces. Conservation practices in the NRCS Field Office Technical Guide and a conservation plan for the subject farm or ranch are not considered in the calculation of impervious surfaces. Temporary greenhouses that cover the soil surface for less than 6 months are not considered in the calculation of impervious surface limitations.
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Samples: directives.sc.egov.usda.gov, directives.sc.egov.usda.gov, directives.sc.egov.usda.gov