Translations:Einzugsgebiet/36/en
As a result, the value C ranges between 0.8 < C < 0.9. This ensures that different rainfall indices are calculated for the same amount of rainfall at different times of the year and therefore a changed willingness to flow is taken into account. Depending on the prehistory quantified in this way, a current discharge coefficient can be calculated using the CN values specific to the area and valid for average prehistory conditions. The following figure shows for different CN-values how the current discharge coefficient changes depending on the prehistory. Since the runoff readiness of a catchment area changes in the course of a rainfall event due to soil moisture, the runoff coefficient is also adjusted during an event as a function of the cumulative precipitation height.
Dependence of the discharge coefficient on the previous history
Dependence of the runoff coefficient on the cumulative precipitation sum
