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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/nhess-2020-105
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-105
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  22 Apr 2020

22 Apr 2020

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This preprint is currently under review for the journal NHESS.

Assessment of probability distributions and minimum storage draft-rate analysis in the equatorial region

Hasrul Hazman Hasan1, Siti Fatin Mohd Razali1, Nur Shazwani Muhammad1, Zawawi Samba Mohamed1, and Firdaus Mohamad Hamzah2 Hasrul Hazman Hasan et al.
  • 1Department of Civil Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia
  • 2Department of Engineering Education, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia

Abstract. Streamflow information is critical to the management and development of water resources strategies. The reliability of water supply from rivers depends on their low flow characteristics. Low flow frequency analysis was derived using the Weibull plotting position and four specific distributions. Maximum likelihood was used to parameterise, while Kolmogorov–Smirnov tests are used to evaluate their fit to the dataset. The best probability distribution is then selected based on individual probabilistic analysis and the flow duration curve for the study threshold level (Q90 percentiles) with the pooling procedure derived to quantify the drought characteristics. The mass curve is used to quantify the minimum storage draft-rate required to maintain the 50 % mean annual flow for a recurrence interval of 10 years. The results indicated the hydrological droughts have generally become more frequent and critical in the availability of rivers to sustain water demand during low flows.

Hasrul Hazman Hasan et al.

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Hasrul Hazman Hasan et al.

Hasrul Hazman Hasan et al.

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Short summary
This study concentrates on three significant issues. First, to find the best-fit models for determining the frequency analysis of low flow over return periods. Second, to evaluate the threshold level value for drought analysis, and finally, to estimate the storage-draft rate required at the recurrence interval for the streamflow station in Selangor. The results are useful for developing measures to maintain flow variability and can be used to develop policies for risk management.
This study concentrates on three significant issues. First, to find the best-fit models for...
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