Curve Number (CN) definition
Curve Number (CN) means an index that represents the runoff potential from a storm event for a specific land area for use in runoff prediction models. Curve numbers range from 0 to 100, with a smaller curve number representing low runoff potential and a higher curve number representing high runoff potential. The factors combined to determine the curve number include Hydrologic Soil Group (HSG); cover type, such as pavement, grass, bare soil, etc.; treatment or a modification of cover type based on the management of the cover, such as contouring of agricultural lands, or mowing of urban parks; and hydrologic condition, representing the condition of cover type, including the density of plantings or degree of surface roughness.
Examples of Curve Number (CN) in a sentence
Runoff volume calculations are based on the Runoff Curve Number (CN) method.
In addition to varying the imperviousness of the sub- catchments, the Curve Number (CN) value for the pervious portion of each area was also varied to simulate varying degrees of soil infiltration capabilities.