Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhessd-3-4095-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 Jun 2015
Review status
This discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). A final paper in NHESS is not foreseen.
Representative rainfall thresholds for flash floods in the Cali river watershed, Colombia
A. D. Ávila1,2, Y. E. Carvajal1, and F. Justino2 1Water Resources and Soil Engineering Research Group (IREHISA), School of Natural Resources Engineering and Environment (EIDENAR), Universidad del Valle, Cali, Colombia
2Department of Agricultural Engineering, Universidade Federal de Viçosa, Viçosa, Brazil
Abstract. In the 21st century, societies face a significant increase in the number of extreme hydrometeorological events associated with climate variability (CV) and/or climate change (CC). Research has recently focused on establishing adaptation and mitigation measures to counteract the effects of CV and CC, especially those associated with precipitation, such as flash floods and flooding. In this study, 27 floods, listed in the historical database of natural disasters (DesInventar), occurring between 1980 and 2012, were analyzed. Using the daily hydrometeorological data, representative rainfall thresholds were defined to predict flash floods in the hydrographic basin of the Cali River, Colombia. Antecedent rainfall (AR), or short-term rain (1, 3, 5 and 7 days), and accumulated antecedent rainfall (AAR), or long-term rain (5, 7, 10, 15, 20, 25, 30, 60 and 90 days), levels were defined. The analysis showed that the greatest determinant for the occurrence of floods is AAR, with thresholds greater than 73, 95, 124, 170, 218 and 273 mm, for 5, 7, 10, 15, 20 and 25 days, respectively. Additionally, the data showed that, historically, the greatest number of flash floods (81.7 %) occurred in the Cali River basin in the months of April, May, and June.

Citation: Ávila, A. D., Carvajal, Y. E., and Justino, F.: Representative rainfall thresholds for flash floods in the Cali river watershed, Colombia, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhessd-3-4095-2015, 2015.
A. D. Ávila et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C1242: 'Review of the paper NHESS-2015-157', Lorenzo Marchi, 15 Jul 2015 Printer-friendly Version Supplement 
 
RC C1260: 'Review of paper nhess-2015-157', Thea Turkington, 16 Jul 2015 Printer-friendly Version 
A. D. Ávila et al.
A. D. Ávila et al.

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Short summary
Tropical regions, such as the South America Andes and mountainous countries, are highly susceptible to floods and flash floods due to environmental and socio-economic characteristics. In this study, critical thresholds of daily accumulated rainfall for the prediction of flash floods in the Cali River basin are proposed. These findings can shed some light on hydrologic behavior, and provide decision-making criteria for water resource planners to aid in the prevention and mitigation strategies.
Tropical regions, such as the South America Andes and mountainous countries, are highly...
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