Importance of Storm Type and Initial Loss Value for Flood Discharge Estimation

Document Type : Original Article

Authors

1 - Instructor., Faculty of Civil Eng, Univ. of Jame, Tehran, & Technical Team MAHAB GHODSS Cons. Eng

2 Assoc. Prof., Irrigation Eng. Department, Univ. of Tehran.

Abstract

Available flood discharge data has a significant role in the procedure of flood control and management. In sites with a lack of data, a simulation model with the synthetic and estimated data is recommended. In this study a rainfall-runoff model (HEC-HMS) based on SCS (curve number) and flood routing (lag-trend) methods have been applied for a watershed situated in the north of Neyshabour, Northeast of Iran. The effects of several storm patterns and initial losses (0.2 & 0.05) have been studied for flood estimation. The results indicated that for a storm pattern of type IV and initial losses of 0.2, the estimated peak flood had more accuracy among patterns. However with this model 53% of 15 observed flood peak data is acceptable. Other result showed that the SCS method has less accuracy and it is not recommended for a watershed like north Neyshaboor flood management and should be calibrated.       

Keywords

References

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Iran-Water Resources Research
Volume 5, Issue 3
June 2010
Pages 59-63

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History

  • Receive Date: 25 May 2008
  • Accept Date: 13 October 2009

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