The CN-SCS method is one of the most common methods in runoff and peak discharge estimation.
Sensitivity analysis and relative importance assessment of five parameters, CN, time of concentration, rainfall
in different return periods, watershed area and
has not completely processed by sensitivity analysis. For finding the nature of curve number SCS method
in estimating peak discharge and its reaction to change in input parameters, the effects of 5 parameters
including CN, time of concentration (TC), watershed area (A), rainfall amount in different return periods
(P) and finally,
equal to 0.133) were surveyed on peak discharge. Results indicate the effective role of CN on peak discharge
as the most important output of model. The sensitivity of the model in estimation of peak discharge
highly increases in large return periods. The sensitivity analysis of curve number SCS method was performed
in MATLAB programming environment.