Geography Journal / 2013 / Article / Tab 4

Research Article

Estimation of Peak Flood Discharge for an Ungauged River: A Case Study of the Kunur River, West Bengal

Table 4

Compute the weighted curve number (CN) using table value (see Table  5.5.2, p.150 in [33]).

Hydrological soil groupMajor land use and soil characteristicsCovering basin area (%)CNProduct

AUrban area with 50 to 75 % impervious land349147
BModerate infiltration rate with coarse texture land, pasture, and open scrap area779553
CLow infiltration rate with fine sandy loam, dense forest, and degraded wood land55774235
DFine clay to silt soil with agricultural land35722520

Thus, weighted CN = 7455/100 = 74.55Σ100Σ7455

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