Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area

Tshepo Sylvester Mawasha

doi:doi:10.11648/j.ajmcm.20210604.11

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Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area

Tshepo Sylvester Mawasha

Published in American Journal of Mathematical and Computer Modelling (Volume 6, Issue 4)

Received: 16 May 2021 Accepted: 9 June 2021 Published: 23 November 2021

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Abstract

Flooding is among the most extreme weather events, endangering lives and causing significant property damage each year. Flood events in the Centurion area occur every year during the rainy season. This causes considerable damage to road infrastructure in both residential and commercial areas. The objective of this study is to incorporate hydraulic/hydrological (i.e., HEC-RAS/HEC-GeoRAS) models with geo-spatial techniques to predict flood extent and depth along Hennops River in Centurion area, Tshwane Metropolitan Municipality, Gauteng Province. In this study, floodplain inundation areas with different return periods were predicted in a 3.1 km distance of the Hennops River that passes through the Centurion area. Flood hazard analysis indicated that areas at close proximity to the Hennops River were submerged by a minimum and maximum flood depth of 0.4 m to more than 1.1 m for both 50 and 100 year flood recurrence interval. The study’s findings show that integrating GIS with HEC-RAS/HEC-GeoRAS techniques is a useful tool for floodplain mapping and analysis. Hence, the findings of this study are expected to be used as a foundation for the identification of causative factors of flash floods and the prediction of flash floods within the study area in future. The floodplain delineation maps developed in this study will be useful to policy-makers and the relevant authorities, as well as to local residents, in finding suitable measures for residential development along the floodplain while reducing flood risk in the study area.

Published in	American Journal of Mathematical and Computer Modelling (Volume 6, Issue 4)
DOI	10.11648/j.ajmcm.20210604.11
Page(s)	55-62
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

GIS, HEC-RAS/HEC-GeoRAS, Flood Depth

References

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APA Style

Tshepo Sylvester Mawasha. (2021). Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. American Journal of Mathematical and Computer Modelling, 6(4), 55-62. https://doi.org/10.11648/j.ajmcm.20210604.11

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ACS Style

Tshepo Sylvester Mawasha. Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. Am. J. Math. Comput. Model. 2021, 6(4), 55-62. doi: 10.11648/j.ajmcm.20210604.11

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AMA Style

Tshepo Sylvester Mawasha. Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. Am J Math Comput Model. 2021;6(4):55-62. doi: 10.11648/j.ajmcm.20210604.11

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@article{10.11648/j.ajmcm.20210604.11,
  author = {Tshepo Sylvester Mawasha},
  title = {Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area},
  journal = {American Journal of Mathematical and Computer Modelling},
  volume = {6},
  number = {4},
  pages = {55-62},
  doi = {10.11648/j.ajmcm.20210604.11},
  url = {https://doi.org/10.11648/j.ajmcm.20210604.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmcm.20210604.11},
  abstract = {Flooding is among the most extreme weather events, endangering lives and causing significant property damage each year. Flood events in the Centurion area occur every year during the rainy season. This causes considerable damage to road infrastructure in both residential and commercial areas. The objective of this study is to incorporate hydraulic/hydrological (i.e., HEC-RAS/HEC-GeoRAS) models with geo-spatial techniques to predict flood extent and depth along Hennops River in Centurion area, Tshwane Metropolitan Municipality, Gauteng Province. In this study, floodplain inundation areas with different return periods were predicted in a 3.1 km distance of the Hennops River that passes through the Centurion area. Flood hazard analysis indicated that areas at close proximity to the Hennops River were submerged by a minimum and maximum flood depth of 0.4 m to more than 1.1 m for both 50 and 100 year flood recurrence interval. The study’s findings show that integrating GIS with HEC-RAS/HEC-GeoRAS techniques is a useful tool for floodplain mapping and analysis. Hence, the findings of this study are expected to be used as a foundation for the identification of causative factors of flash floods and the prediction of flash floods within the study area in future. The floodplain delineation maps developed in this study will be useful to policy-makers and the relevant authorities, as well as to local residents, in finding suitable measures for residential development along the floodplain while reducing flood risk in the study area.},
 year = {2021}
}

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TY  - JOUR
T1  - Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area
AU  - Tshepo Sylvester Mawasha
Y1  - 2021/11/23
PY  - 2021
N1  - https://doi.org/10.11648/j.ajmcm.20210604.11
DO  - 10.11648/j.ajmcm.20210604.11
T2  - American Journal of Mathematical and Computer Modelling
JF  - American Journal of Mathematical and Computer Modelling
JO  - American Journal of Mathematical and Computer Modelling
SP  - 55
EP  - 62
PB  - Science Publishing Group
SN  - 2578-8280
UR  - https://doi.org/10.11648/j.ajmcm.20210604.11
AB  - Flooding is among the most extreme weather events, endangering lives and causing significant property damage each year. Flood events in the Centurion area occur every year during the rainy season. This causes considerable damage to road infrastructure in both residential and commercial areas. The objective of this study is to incorporate hydraulic/hydrological (i.e., HEC-RAS/HEC-GeoRAS) models with geo-spatial techniques to predict flood extent and depth along Hennops River in Centurion area, Tshwane Metropolitan Municipality, Gauteng Province. In this study, floodplain inundation areas with different return periods were predicted in a 3.1 km distance of the Hennops River that passes through the Centurion area. Flood hazard analysis indicated that areas at close proximity to the Hennops River were submerged by a minimum and maximum flood depth of 0.4 m to more than 1.1 m for both 50 and 100 year flood recurrence interval. The study’s findings show that integrating GIS with HEC-RAS/HEC-GeoRAS techniques is a useful tool for floodplain mapping and analysis. Hence, the findings of this study are expected to be used as a foundation for the identification of causative factors of flash floods and the prediction of flash floods within the study area in future. The floodplain delineation maps developed in this study will be useful to policy-makers and the relevant authorities, as well as to local residents, in finding suitable measures for residential development along the floodplain while reducing flood risk in the study area.
VL  - 6
IS  - 4
ER  -

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Author Information

Tshepo Sylvester Mawasha

Department of Geoscience, Nelson Mandela University, Port Elizabeth, South Africa

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APA Style

Tshepo Sylvester Mawasha. (2021). Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. American Journal of Mathematical and Computer Modelling, 6(4), 55-62. https://doi.org/10.11648/j.ajmcm.20210604.11

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ACS Style

Tshepo Sylvester Mawasha. Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. Am. J. Math. Comput. Model. 2021, 6(4), 55-62. doi: 10.11648/j.ajmcm.20210604.11

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AMA Style

Tshepo Sylvester Mawasha. Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area. Am J Math Comput Model. 2021;6(4):55-62. doi: 10.11648/j.ajmcm.20210604.11

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@article{10.11648/j.ajmcm.20210604.11,
  author = {Tshepo Sylvester Mawasha},
  title = {Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area},
  journal = {American Journal of Mathematical and Computer Modelling},
  volume = {6},
  number = {4},
  pages = {55-62},
  doi = {10.11648/j.ajmcm.20210604.11},
  url = {https://doi.org/10.11648/j.ajmcm.20210604.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmcm.20210604.11},
  abstract = {Flooding is among the most extreme weather events, endangering lives and causing significant property damage each year. Flood events in the Centurion area occur every year during the rainy season. This causes considerable damage to road infrastructure in both residential and commercial areas. The objective of this study is to incorporate hydraulic/hydrological (i.e., HEC-RAS/HEC-GeoRAS) models with geo-spatial techniques to predict flood extent and depth along Hennops River in Centurion area, Tshwane Metropolitan Municipality, Gauteng Province. In this study, floodplain inundation areas with different return periods were predicted in a 3.1 km distance of the Hennops River that passes through the Centurion area. Flood hazard analysis indicated that areas at close proximity to the Hennops River were submerged by a minimum and maximum flood depth of 0.4 m to more than 1.1 m for both 50 and 100 year flood recurrence interval. The study’s findings show that integrating GIS with HEC-RAS/HEC-GeoRAS techniques is a useful tool for floodplain mapping and analysis. Hence, the findings of this study are expected to be used as a foundation for the identification of causative factors of flash floods and the prediction of flash floods within the study area in future. The floodplain delineation maps developed in this study will be useful to policy-makers and the relevant authorities, as well as to local residents, in finding suitable measures for residential development along the floodplain while reducing flood risk in the study area.},
 year = {2021}
}

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TY  - JOUR
T1  - Combined 1D Modelling with HEC-RAS for Delineation Floodplain Area: A Case Study of Hennops River in the Centurion Area
AU  - Tshepo Sylvester Mawasha
Y1  - 2021/11/23
PY  - 2021
N1  - https://doi.org/10.11648/j.ajmcm.20210604.11
DO  - 10.11648/j.ajmcm.20210604.11
T2  - American Journal of Mathematical and Computer Modelling
JF  - American Journal of Mathematical and Computer Modelling
JO  - American Journal of Mathematical and Computer Modelling
SP  - 55
EP  - 62
PB  - Science Publishing Group
SN  - 2578-8280
UR  - https://doi.org/10.11648/j.ajmcm.20210604.11
AB  - Flooding is among the most extreme weather events, endangering lives and causing significant property damage each year. Flood events in the Centurion area occur every year during the rainy season. This causes considerable damage to road infrastructure in both residential and commercial areas. The objective of this study is to incorporate hydraulic/hydrological (i.e., HEC-RAS/HEC-GeoRAS) models with geo-spatial techniques to predict flood extent and depth along Hennops River in Centurion area, Tshwane Metropolitan Municipality, Gauteng Province. In this study, floodplain inundation areas with different return periods were predicted in a 3.1 km distance of the Hennops River that passes through the Centurion area. Flood hazard analysis indicated that areas at close proximity to the Hennops River were submerged by a minimum and maximum flood depth of 0.4 m to more than 1.1 m for both 50 and 100 year flood recurrence interval. The study’s findings show that integrating GIS with HEC-RAS/HEC-GeoRAS techniques is a useful tool for floodplain mapping and analysis. Hence, the findings of this study are expected to be used as a foundation for the identification of causative factors of flash floods and the prediction of flash floods within the study area in future. The floodplain delineation maps developed in this study will be useful to policy-makers and the relevant authorities, as well as to local residents, in finding suitable measures for residential development along the floodplain while reducing flood risk in the study area.
VL  - 6
IS  - 4
ER  -

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