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Babak Mohammadi

Doctoral student

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Credibility of design rainfall estimates for drainage infrastructures : extent of disregard in Nigeria and proposed framework for practice

Author

  • Oluwatobi Aiyelokun
  • Quoc Bao Pham
  • Oluwafunbi Aiyelokun
  • Anurag Malik
  • S. Adarsh
  • Babak Mohammadi
  • Nguyen Thi Thuy Linh
  • Mohammad Zakwan

Summary, in English

Rainfall intensity or depth estimates are vital input for hydrologic and hydraulic models used in designing drainage infrastructures. Unfortunately, these estimates are susceptible to different sources of uncertainties including climate change, which could have high implications on the cost and design of hydraulic structures. This study adopts a systematic literature review to ascertain the disregard of credibility assessment of rainfall estimates in Nigeria. Thereafter, a simple framework for informing the practice of reliability check of rainfall estimates was proposed using freely available open-source tools and applied to the north central region of Nigeria. The study revealed through a synthesis matrix that in the last decade, both empirical and theoretical methods have been applied in predicting design rainfall intensities or depths for different frequencies across Nigeria, but none of the selected studies assessed the credibility of the design estimates. This study has established through the application of the proposed framework that drainage infrastructure designed in the study area using 100–1000-year return periods are more susceptible to error. And that the extent of the credibility of quantitative estimates of extreme rains leading to flooding is not equal for each variability indicator across a large spatial region. Hence, to optimize informed decision-making regarding flood risk reduction by risk assessor, variability and uncertainty of rainfall estimates should be assessed spatially to minimize erroneous deductions.

Department/s

  • Dept of Physical Geography and Ecosystem Science

Publishing year

2021-07-19

Language

English

Pages

1557-1588

Publication/Series

Natural Hazards

Volume

109

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Physical Geography
  • Water Engineering

Keywords

  • Design rainfall estimates
  • Parametric bootstrap
  • Stochastic simulation
  • Two-dimensional Monte Carlo framework
  • Variability and uncertainty analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 0921-030X