Sensitivity analysis of the hydrological and hydraulic parameters of the SWMM model and its application in urban drainage systems

Authors

DOI:

https://doi.org/10.13140/RG.2.2.26994.66248

Keywords:

urban drainage, SWMM, hydrological parameters, hydraulic parameters

Abstract

Simulation models are widely used for the design and management of urban drainage systems, such as the SWMM Stormwater Management Model. However, the quality of its results is directly related to the quality of the data provided, since an incorrect estimate of these may lead to a different behavior than expected in the real case. There is uncertainty in many hydrological and hydraulic input parameters of the model, since most of them are estimated and there are no measured data to calibrate it. In this work a sensitivity analysis is carried out to various parameters to detect the most influential in the simulation of urban drainage systems. It consisted of locally varying each of the parameters and assessing their influence on the variation of the flows and maximum levels at a point in the Copacoa Urbanization, Palavecino municipality of the Lara State, Venezuela. From the results obtained, it is concluded that for simulations of urban watersheds where impervious areas predominate, the least sensitive method for the generation of the rain hietrogram is that of alternate blocks, while the one with the greatest variability is the triangular hietrogram. Regarding the basin component, the most sensitive parameters are the percentage of impermeable area, the slope of the basin and the Manning coefficient assigned to the impermeable area. In relation to the duct, the Manning coefficient parameter also presented an appreciable sensitivity, but of a lesser magnitude compared to those obtained for the basin component.

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Author Biographies

Karla José Guanipa Rivero, Universidad Centroccidental Lisandro Alvarado. Venezuela

Karla José Guanipa Rivero. Civil engineer. Universidad Centroccidental Lisandro Alvarado. Venezuela. Mail: karlagrivero@gmail.com.

América Libertad Lugo Aguilar, Universidad Centroccidental Lisandro Alvarado. Venezuela

América Libertad Lugo Aguilar. Civil engineer. Universidad Centroccidental Lisandro Alvarado. Venezuela. Mail: libertad91alla@gmail.com.

Jean Carlos Rincón Ortiz, Universidad Centroccidental Lisandro Alvarado. Venezuela

Jean Carlos Rincón Ortiz. Docente Investigador de la Universidad Centroccidental Lisandro Alvarado. Ingeniero Civil. MSc. en Ingeniería Hidráulica. Venezuela. Correo: jcrincon@ucla.edu.ve

References

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Published

2020-01-19

How to Cite

Guanipa Rivero, K. J., Lugo Aguilar, A. L., & Rincón Ortiz, J. C. (2020). Sensitivity analysis of the hydrological and hydraulic parameters of the SWMM model and its application in urban drainage systems. Gaceta Técnica, 21(1), 44-63. https://doi.org/10.13140/RG.2.2.26994.66248

Issue

Section

Research articles