Performance Evaluation of stormwater collection system and sensitivity analysis of parameters affecting it (study of districts 10 and 11 of Mashhad)

Document Type : Original Article

Authors

1 Ph.D. Student of Water Engineering, Department of Water Engineering, Ferdowsi University of Mashhad. Mashhad, Iran

2 Professor, Water Engineering Department, Ferdowsi University of Mashhad,

Abstract

Urbanization causes the increase of runoff to stormwater collection systems. In this research, using the SWMM model, the stormwater collection system of districts 10 and 11 of Mashhad has been evaluated. Furthermore, sensitivity analysis model has been used to determine the relationship between model variables as well as to determine priorities of the effect of parameters on output. The results of studies show that the existing collection system has about 80% of discharge capacity of surface runoff and in the modeling 38.2 and 29.1% of the canals with a 50 and 5 years of return period, respectively, face with waterlogging and back flow. In order to assess the effect of parameters on model performance, 8 parameters were selected and their effect on output discharge was evaluated. The results showed that the percentage of impervious surfaces, the equivalent width and the roughness coefficient in pervious and impervious surfaces, respectively, have the most effect on the output discharge. Also, the parameter of the percentage of impervious surfaces without the surface reserve has the least effect. With a 30% increase in impervious surfaces, the peak discharge and the surface runoff increase by 20.1% and 19.1%, respectively. The assessment indicated that the land use change, the increase of impervious surfaces, the decrease of roughness coefficient and unsuitable and old design of existing canals are the main reasons for decrease of performance of stormwater collection system in the study area.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 15, Issue 5 - Serial Number 89
January and February 2022
Pages 1067-1080

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