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Study on Improved Method for Calculating Runoff Coefficient of Rational Method  

Lee, Young-Dai (부경대학교 공과대학 건설공학부)
Kim, Jong-Soon (부경대학교 대학원 토목공학과)
Kim, Young-Teak (부경대학교 대학원 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.7, no.4, 2007 , pp. 67-74 More about this Journal
Abstract
Rational method has been widely used to calculate peak runoff drainage design or small watershed because of simplicity and convenience. Runoff coefficient(C) is the most important parameter in the rational method which varies according to rainfall intensity, return period, rainfall duration time and soil characteristics. In practice, constant which is value of C in rational formula has been used from the table, originally based on ASCE. These table value does not consider the upper conditions of the depending factors, hence peak runoff calculation could be in correct. Therefore to calculate C in this paper we have devised an improved formula, considering relationship with rainfall duration, return period and CN of NRCS method. This formula is considered to be more reliable and helpful to the hydrologists and engineers to predict correct peak runoff.
Keywords
Rational method; Duration time; Return period; Curve number(CN);
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1 유동훈 (1995) 유출량산정을 위한 합리식의 개선. 대한토목학회 학술발표회 논문집 (II), 대한토목학회, pp. 123-126
2 Mishra, S. K., J. J. Sansalone and Vijay P.. Singh (2004) Partitioning Analog for Metal Element in Urban Rainfall-Runoff Overland Flow Using the Soil Conservation Service Curve Number Concept. Journal of Environmental Engineering, ASCE, pp. 145-154
3 Richard H. McCuen and Timothy R. Bondelid (1981) Relationship between Curve Number and Runoff Coefficient, Journal of Irrigation and Drainage Division, ASCE, pp. 395-400
4 김지호 (2003) 우리나라 하천유역의 합리식 유츌계수 산정에 관한 연구, 박사학위논문, 홍익대학교
5 하천설계기준 (2005) 건설부승인 하천설계기준. (사)한국수자원학회, pp. 335-337
6 Mulvaney,T.J (1851) On the Use of Self-registering Rain and Flood Gauges. Proceedings of the Institution of Civil Engineers, Vol. 4, No. 2, pp. 1-8
7 이재철, 박공춘, 한형근 (1997) 도시내 우수관거 결정을 위한 합리식의 유출계수에 관한 조사연구. 1996년 분과위원회 연구사업보고서, 한국수자원학회, pp. 1-1 - 1-38
8 Ponce, V. M. (1989) Engineering hydrology Principle and Practices, Prentice Hall, Englewood Cliffs, New Jersey, pp. 119-127
9 윤용남, 원석연 (1992) 도시유역의 홍수량산정을 위한 도시홍수유출모형의 연구. 대한토목학회 학술발표회 개요집(II), 대한토목학회, pp. 168-171
10 Kuichling, E. (1889) The Relation between the Rainfall and Runoff from Small Urban Area. Transaction of ASCE, Vol. 101, pp. 143-183
11 정종호, 윤용남(2004) 수자원설계실무. 구미서관, pp. 15-19