Geoscience Reference
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modified curve numbers for dry and wet antecedent conditions, following the standard SCS
procedures based on the preceding five-day rainfalls. However, they found no strong corre-
lation between curve number and antecedent condition for the individual storms, suggesting
that interactions with individual storm characteristics, tillage, plan growth and temperature
were sufficient to mask the effect of antecedent rainfall alone.
Despite its limitations, the SCS-CN method has been widely used because the tabulated
curve number values provide a relatively easy way of moving from a GIS dataset on soils and
vegetation to a rainfall-runoff model (see for example Berod
et al.
, 1999; Brath
et al.
, 2004,
2006). It does have the important advantage in this respect that it is not formulated on the basis
of point scale measurements, but directly from small catchment measurements.
