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Download scientific diagram | SCS Curve Number Table (Source: TR-55 NRCS, 1986) from publication: URBAN DRAINAGE MODEL COMPARISON AND PERFORMANCE ASSESSMENT | Model comparison and...
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The tables provide estimates of the curve number (CN) as a function of hydrologic soil group (HSG), cover type, treatment, hydrologic condition, antecedent runoff condition (ARC), and...
TR-55 incorporates current SCS procedures. This revision includes results of recent research and other changes based on experience with use of the original edition. The major revisions and additions are: • A flow chart for selecting the appropriate proce-dure; • Three additional rain distributions; • Expansion of the chapter on runoff ...
To estimate runoff from storm rainfall, SCS uses the runoff curve number (CN) method (see chapters 4 through 10 of NEH-4, SCS 1985). Determination of CN depends on the watershed’s soil and cover conditions, which the model represents as hydrologic soil group, cover type, treatment, and hydrologic condition.
The runoff curve number was developed from an empirical analysis of runoff from small catchments and hillslope plots monitored by the USDA. It is widely used and is an efficient method for determining the approximate amount of direct runoff from a rainfall event in a particular area.
The SCS curve number is a function of the soil’s permeability, land use and antecedent soil water conditions. Typical curve numbers for moisture condition II are listed in tables 2:1-1, 2:1-2 and 2:1-3 for various land covers and soil types (SCS Engineering Division, 1986).
The following table of runoff curve numbers (CN) has been condensed from Tables 2-2(a-d) of SCS (1986), which is an exhaustive listing of runoff curve numbers. The hydrologic soil group refers to the infiltration potential of the soil after prolonged wetting.
