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...

This subpart describes different land uses and land treatments used in estimating runoff CN for hydrologic soil-cover complexes and the hydrologic conditions as described in 210 NEH-630, …

has developed a procedure to divide total depth of rainfall into soil retention, initial abstractions, and effective rainfall. This parameter is referred to as a curve number (CN). The CN is based on soil type, …

Each subcatchment uses a Curve Number (CN) to characterize the runoff properties for a particular soil and ground cover. The CN value is a primary input parameter for the SCS runoff equation, as used …

Composite CN’s for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage (CN = 98) and the pervious area CN. The pervious area CN’s are …

Jun 11, 2025 · The Curve Number is a dimensionless parameter that represents the runoff potential of a watershed or a specific land area. It is a function of land use, soil type, and antecedent moisture …

Apr 29, 2025 · Explore best practices for using curve number tables to assess soil and water health, considering soil types, land cover, and moisture conditions.

It is necessary to develop “lookup tables” which associate a curve number with a given combination of land use and soil type. In GISHydro2000, there are several such tables depending on the particular …

Jan 6, 2026 · This guide demonstrate how to create a curve number grid using land use and soil datasets and then computing the average curve number value for subbasins. The steps for creating …

Aug 19, 2025 · Accurate hydrologic modeling in the Watershed Modeling System (WMS) depends on reliable runoff estimation. One of the most widely used methods for this is the SCS Curve Number …