Hydraulic Stability Examination of Rainwater Reservoir Pipe Network System on Various Inflow Conditions

유입량 변화에 따른 도심지 내 우수저류조 관망시스템의 안정성 검토

  • Yoo, Hyung Ju (Department of Civil Engineering, Hongik University) ;
  • Kim, Dong Hyun (Department of Civil Engineering, Hongik University) ;
  • Maeng, Seung Jin (Department of Agricultural and Rural Engineering, Chungbuk University) ;
  • Lee, Seung Oh (Department of Civil Engineering, Hongik University)
  • 유형주 (홍익대학교 토목공학과) ;
  • 김동현 (홍익대학교 토목공학과) ;
  • 맹승진 (충북대학교 지역건설공학과) ;
  • 이승오 (홍익대학교 토목공학과)
  • Received : 2019.11.10
  • Accepted : 2019.12.12
  • Published : 2019.12.31


Recently, as the occurrence frequency of sudden floods due to climate change increased, it is necessary to install the facilities that can cope with the initial stormwater. Most researches have been conducted on the design of facilities applying the Low Impact Development (LID) and the reduction effect on rainfall runoff to examine with 1D or 2D numerical models. However, the studies on the examination about flow characteristics and stability of pipe network systems were relatively insufficient in the literature. In this study, the stability of the pipe network system in rainwater storage tank was examined by using 3D numerical model, FLOW-3D. The changes of velocity and dynamic pressure were examined according to the number of rainwater storage tank and compared with the design criteria to derive the optimal design plan for a rainwater storage tank. As a results of numerical simulation with the design values in the previous study, it was confirmed that the velocity became increased as the number of rainwater storage tank increased. And magnitude of the velocity in pipes was formed within the design criteria. However, the velocity in the additional rainwater storage pipe was about 3.44 m/s exceeding the allowable range of the design criteria, when three or more additional rainwater storage tanks were installed. In the case of turbulence intensity and bottom shear stress, the bottom shear stress was larger than the critical shear stress as the additional rainwater storage was increased. So, the deposition of sediment was unlikely to occur, but it should be considered that the floc was formed by the reduction of the turbulence intensity. In addition, the dynamic pressure was also satisfied with the design criteria when the results were compared with the allowable internal pressure of the pipes generally used in the design of rainwater storage tank. Based on these results, it was suitable to install up to two additional rainwater storage tanks because the drainage becomes well when increasing of the number of storage tank and the velocity in the pipe becomes faster to be vulnerable to damage the pipe. However, this study has a assumption about the specifications of the rainwater storage tanks and the inflow of stormwater and has a limitation such that deriving the suitable rainwater storage tank design by simply adding the storage tank. Therefore, the various storage tank types and stormwater inflow scenarios will be asked to derive more efficient design plans in the future.


  1. Choi, I. H. and Kim, J. W. (2016). A Study on Effects of Salinity on Deposition and Erosion of Cohesive Sediments. Journal of the Korean Society of Hazard Mitigation. 16: 317-324.
  2. Guo, Y. and Adams, B. J. (1998). Hydrologic Analysis of Urban Catchments with Event-based Probabilistic Models: Runoff Volume. Water Resources Research. 34(12): 3421-3431.
  3. Jia, H., Lu, Y., Shaw, L. Y., and Chen, Y. (2012). Planning of LID-BMPs for Urban Runoff Control: The Case of Beijing Olympic Village. Separation and Purification Technology. 84: 112-119.
  4. KEI (2014). LID Implementation Scheme for Environmental Impact Assessment.
  5. Kim, J. H., Lee, C. Y., and Joo, J. G. (2017). Evaluation of the Effect of Low Impact Development on the Subbasin-based Stormwater Reduction. Journal of the Korean Society of Hazard Mitigation. 17: 523-532.
  6. Korea Land & Housing Corporation (LH). (2010). A Study on the Feasibility Study of the Maximum Flow Rate Criterion for the Design of the Minimum Cost Superior Pipe Network.
  7. Lee, J. M. (2019). Stability Analysis of Steep-Sloped Sewer Manhole Using Observation Data and Numerical Analysis Model. Journal of the Korean Society of Hazard Mitigation. 19: 193-203.
  8. Liao, Z. L., Zhang, G. Q., Wu, Z. H., He, Y., and Chen, H. (2015). Combined Sewer Overflow Control with LID based on SWMM: An Example in Shanghai, China. Water Science and Technology. 71(8): 1136-1142.
  9. Luan, Q., Fu, X., Song, C., Wang, H., Liu, J., and Wang, Y. (2017). Runoff Effect Evaluation of LID through SWMM in Typical Mountainous, Low-lying Urban Areas: A Case Study in China. Water. 9(6): 439.
  10. Manual, F. U. (2011). Flow3D User Manual, v9. 4.2. Flow Science. Inc.. Santa Fe. NM.
  11. ME (2015). Standard of Sewer Facility. ME.
  12. ME (2017). Standard of Sewer Design. ME.
  13. MOLIT (2016). Development of Environment Friendly Early Rainwater Removal and Rainwater Storage Facility. MOLIT.
  14. Son, M. W. (2011). Research Trends on the Simulation of Cohesive Sediment. Water for future. 44(3): 51-58.
  15. Vanoni, V. A. (2006). Sedimentation Engineering. (Ed.). American Society of Civil Engineers.
  16. Wang, W. L., Li, J. Q., Gong, Y. W., Zhu, M. J., and Zhang, Q. K. (2012). LID Stormwater Control Effect Simulation based on SWMM. China Water & Wastewater. 28(21): 42-44.
  17. Yoon, E. H., Park, J. K., Shin, H. S., and Lee, J. H. (2017). Establishment of LID Demonstration Complex Monitoring System and Analysis of Storage Efficiency. Journal of the Korean Society of Hazard Mitigation. 17: 345-353.