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Rapid Assessment of The October 2020 Hyderabad Urban Flood and Risk Analysis Using Geospatial Data


Affiliations
1 Department of Civil Engineering, Sree Vidyanikethan Engineering College, Tirupati 517 102, India
2 Disaster Management Division, Indian Institute of Remote Sensing, Dehradun 248 001, India
3 Department of Civil Engineering, National Institute of Technology, Warangal 506 004, India
 

The present study looks into the Hyderabad urban floods of October 2020 from a geospatial perspective. The spatial extent and severity of the flooding event for a part of the urban catchment (Zone-12) of Hyderabad city are modelled using HEC-RAS 1D–2D considering 13 October 2020 rainfall event. The study compares the present flooding to the previous flooding incidence which impacted Hyderabad, almost a decade back on 24 August 2000. The study shows that rapid unplanned urbanization ignoring the regional and local hydrological landscape has aggravated the flooding severity. The study highlights the fact that rapid, uncontrolled urbanization (16.5% increase) over the last two decades have substantially influenced the urban hydrology producing higher flood volumes for comparatively small rainfall event. Thus regulating urbanization, providing enhanced drain capacity, rejuvenating the water bodies and streams is need of an hour to check and reduce the spatial flooding extent.

Keywords

Geospatial Extent, HEC-RAS, Mapping, Modelling, Urban Floods.
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  • Rapid Assessment of The October 2020 Hyderabad Urban Flood and Risk Analysis Using Geospatial Data

Abstract Views: 361  |  PDF Views: 123

Authors

Vinay Ashok Rangari
Department of Civil Engineering, Sree Vidyanikethan Engineering College, Tirupati 517 102, India
C. M. Bhatt
Disaster Management Division, Indian Institute of Remote Sensing, Dehradun 248 001, India
N. V. Umamahesh
Department of Civil Engineering, National Institute of Technology, Warangal 506 004, India

Abstract


The present study looks into the Hyderabad urban floods of October 2020 from a geospatial perspective. The spatial extent and severity of the flooding event for a part of the urban catchment (Zone-12) of Hyderabad city are modelled using HEC-RAS 1D–2D considering 13 October 2020 rainfall event. The study compares the present flooding to the previous flooding incidence which impacted Hyderabad, almost a decade back on 24 August 2000. The study shows that rapid unplanned urbanization ignoring the regional and local hydrological landscape has aggravated the flooding severity. The study highlights the fact that rapid, uncontrolled urbanization (16.5% increase) over the last two decades have substantially influenced the urban hydrology producing higher flood volumes for comparatively small rainfall event. Thus regulating urbanization, providing enhanced drain capacity, rejuvenating the water bodies and streams is need of an hour to check and reduce the spatial flooding extent.

Keywords


Geospatial Extent, HEC-RAS, Mapping, Modelling, Urban Floods.

References





DOI: https://doi.org/10.18520/cs%2Fv120%2Fi12%2F1840-1847