Calculation of Abnormallly Large Flood Discharge Amount Destroying the Stage Gaging Station

이상 호우에 의하여 붕괴된 수위국 지점의 홍수량 규모 결정

An abnormal storm by the typhoon of RUSA in 2002th year was broken out with tremendous flood demages and inundations on the basin of Chogangcheon located in the upper middle part of Guem river's upstream. This flood could not be engaged because it was so big that the stage engaging Songcheon station stuck to Songcheon bridge was destroyed by submerging. In this study the quantity of the flood was calculated by use of Manning's equation and suitable roughness coefficient was suggested.