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Quantitative Modeling and Investigating the Effect of Variation of Permeable Surface on the Volume of Runoff Case Study: Zargande conduit located in Maghsoodbeyg-Sadr area in Tehran

Sabeti Aminaei, Ehsan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42977 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tajrishy, Masoud
  7. Abstract:
  8. Although surface water networks play a very important role in transporting runoff, they contain significant amounts of pollutants entered through the point or non-point sources which cannot be neglected. The goal of this research is quantitative modeling of Zargande reach located in Maghsoodbeyg-Sadr area using SWMM model and investigating the effect of variation of permeable surface on the volume of runoff. Analysis of a 7 hour precipitation with the total of 5 mm cumulative precipitation resulted in 1.6 mm per hour loss of watershed. We utilized a FORTRAN code which minimizes the difference between the Espey synthetic hydrograph and the observed hydrograph for the precipitation to obtain an estimate for the length of the stormwater runoff collection network which is important in converting irregular watersheds to rectangular ones and flood routing using the kinematic wave method. The model has been calibrated over the flow duration curve through the period of 12/12/2010 to 02/02/2011 with the MCDA method and the roughness coefficient and the depth of depression storage over the permeable surface turned out to be 0.18 and 3.08, and on immperamble surfaces equal to 0.018 and 1.54 for flood flow on pervious surfaces 0.15, 2.05 and for impervious surfaces is 0.023 and 1.01. Moreover model verification has been performed for 02/04/2011 to 28/10/2011 and the NSE for the total flow, low flow and flood flow were found to be respectively 91/0,92/0,77/0. Eventually, three different scenarios for decreasing the amount of flow of the floods with 5, 10 and 25 years return period has been defined. Swale construction and utilizing porous cover for sidewalks was found as the best scenario. If we construct swale to have decrease in impervious surface runoff for 3.8%, we can reduce the runoff up to 50% in 1400. Building swale with the capacity of EIA would be more efficient than using porous surface in diminishing the peak of flood flow.


  9. Keywords:
  10. Tehran ; Modeling ; Urban Runoff ; Storm Water Management Model (SWMM)Software ; Swale ; Urban Conduit

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