برآورد دبي حداكثر سيل با استفاده از روش هاي مختلف شماره منحني (مطالعه موردي در البرز مركزي )

A Determination of Peak- Flood using Different Curve Number Methods (Case Study, Central Alborz Area)

Soil conservation service-curve number (SCS-CN) method is one of the most employed methods for computing discharge as well as surface runoff from watersheds. Recent studies show that this much-used method is susceptible to difference in curve number. As a result, much caution is recommended in its application. In this research the above-mentioned method was used and it was found that the asymptotic method would give a better SCS Table method for determining curve number. Results also reveal least peak-flood differences between observed and calculated discharge in the asymptotic method. The discharge while using SCS Table method in different antecedent moisture conditions shows a larger difference with the observed discharge.