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Estimation of Runoff Coefficient according to Revision of Design Criteria, in case of Park

설계기준 변경에 따른 유출계수 추정 - 공원을 중심으로 -

  • Kim, Taegyun (Dept. of Landscape Architecture, Gyengnam National University of Science and Technology) ;
  • Kim, Tae Jin (Dept. of Civil Engineering, Daegu University) ;
  • Lee, Bo-Rim (Dept. of Landscape Architecture, Gyengnam National University of Science and Technology)
  • 김태균 (경남과학기술대학교 조경학과) ;
  • 김태진 (대구대학교 토목공학과) ;
  • 이보림 (경남과학기술대학교 조경학과)
  • Received : 2016.05.05
  • Accepted : 2016.06.21
  • Published : 2016.08.31

Abstract

The rational method is formed area, rainfall intensity and runoff coefficient that is representation of land use or surface type. A runoff coefficient is a range for a each surface conditions. Drainage Sewer Design Guideline revised at 2011 proposes return periods 10~30 year instead of 5~10 year for increasing design flood. Ponce and ASCE refer higher values of runoff coefficient require for higher values of rainfall intensity and return period, therefore runoff coefficient had to be corrected but not. In case of park, land use and surface type are different from Korea and U.S, so impervious area ratio is different. The runoff coefficient for park is estimated considering with impervious area ratio and return period. 1,004's parks in 20 cities are randomly selected for impervious area ratio and runoff coefficient is estimated. And a proportion of 30 year return period runoff coefficient to 10 year return period with rainfall duration is calculated for 69 weather stations. The estimated runoff coefficient is 0.43~0.54 for return period 10~30 year and the difference of region and rainfall duration is not significant.

합리식은 유역 면적, 강우강도와 토지이용 또는 표면형태에 따라 결정되는 일정한 범위의 유출계수로 이루어져있다. 2011년에 개정된 하수도시설기준에서는 5~10년 재현기간의 설계홍수량을 증가하기 위해 재현기간을 10~30년으로 조정하였다. Ponce, ASCE 등은 재현기간(강우강도)이 클수록 큰 유출계수를 적용할 것을 제시하고 있으나, 재현기간의 상향조정에 따른 유출계수의 증가에 대하여서는 현재 조정되지 않은 상태이다. 본 연구에서는 토지이용 및 표면형태에 많은 차이를 보이는 공원을 대상으로 불투수면적비 변화와 설계확률년수 조정에 따른 유출계수를 추정하고자 한다. 첫째, 20개 도시에서 무작위로 선정된 1,004개 공원을 대상으로 표면형태별 면적비를 구하여 유출계수를 추정하였다. 둘째, 재현기간 조정에 대한 영향은 재현기간 10년에 대한 30년의 유출계수비를 69개 기상관측소 지점에 대하여 지속기간별로 구하였다. 이에 따라, 표면형태의 차이와 재현기간 조정을 고려한 재현기간 10~30년 에 대한, 공원의 유출계수는 0.43~0.54의 범위를 가지는 것으로 나타났으며, 지역적 편차와 지속기간별 편차는 크지 않는 것으로 나타났다.

Keywords

References

  1. American Society of Civil Engineers(ASCE) (1970), Design and Construction of Sanitary and Storm Sewer, Mauuals and Reports on Engineering Practicee No.37, USA
  2. Kim, JH. (2003), A study on runoff Coefficient Estimation of Rational Method in Natural Basin, Ph. D. Thesis. Hongik University, Seoul, Rep. of Korea [Korean Literature]
  3. Kim, JH., Park, YJ., Choi, HH. Song, JW. (2004), A study on runoff Coefficient Estimation of Rational Method in Natural Basin, Conference of Korea Water Resources Association, pp.173-177 [Korean Literature]
  4. Korea Water and Wastewater Works Association(KWWA) (2011), Drainage Sewer Design Guideline [Korean Literature]
  5. Lee, YD., Kim, JS., Kim, YT (2007), Study on Improved Method for Calculating Runfoff Coefficient of Rational Method, Korean Society of Hazard Mitigation, 7(4), pp. 67-74[Korean Literature]
  6. Ministry of Land, Infrastructure and Transport(MOLIT) (2011), Koread Precipitation Frequency Data Server, http://www.k-idf.re.kr/
  7. Ponce, V. M (1989), Engineering Hydrology, Principles and Practices, Prentice-Hall, New Jersey
  8. Rantz, S. E. (1971), Suggested Criteria for Hydrologic Design of Storm-Drainage Facilities in the San Francisco Bay Region California, U.S. Geological Survey(USGS), USA
  9. Solano County Water Agency(SCWA) (1985). Hydrology an Drainage Design Procedure prepared by Water Resources Engineering, USA
  10. Yoon, YN (2007) Hydrology - basic and application, Cheong Moon Gak Publishing Co.[Korean Literature]
  11. Yu., CY (2014), Runoff Coefficient Applicaition Review of Rational Method, Korean society of hazard mitigation, v.8 no.4, 2008년, pp.62-68 [Korean Literature]