Investigation of Role of Retention Storage in Tanks (Small Water Bodies) on Future Urban Flooding: A Case Study of Chennai City, India

The Adyar River flowing through Chennai Metropolitan Area (CMA) in Southern India functions as a surplus course of upstream water bodies that are locally known as tanks. During northeast monsoons, the river frequently floods the adjoining city areas. In this study, the impact of dredging and disappe...

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Bibliographic Details
Published in:Water (Basel) 2020-10, Vol.12 (10), p.2875
Main Authors: Nithila Devi, N., Sridharan, B., Bindhu, V. M., Narasimhan, B., Bhallamudi, S. Murty, Bhatt, C. M., Usha, Tune, Vasan, D. Thirumalai, Kuiry, Soumendra Nath
Format: Article
Language:English
Subjects:
Case studies
Climate change
Dredging
Flood control
Flooding
Floods
Hydrology
India
Investigations
Land use
Land use management
Land use planning
Metropolitan areas
Planning
Rain
Rain and rainfall
Rainfall
Retention tanks
Rivers
Storage tanks
Urbanization
Water tanks
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Summary:The Adyar River flowing through Chennai Metropolitan Area (CMA) in Southern India functions as a surplus course of upstream water bodies that are locally known as tanks. During northeast monsoons, the river frequently floods the adjoining city areas. In this study, the impact of dredging and disappearance of tanks on flooding in CMA is analyzed under historical, urbanization, and extreme rainfall scenarios utilizing an urbanization-hydrologic-hydraulic modelling framework. The simulated scenarios highlight the importance of the tanks as a flood control measure for CMA. The major conclusions are (a) dredging the tanks uniformly by 2 m can compensate the increase in flooding due to urbanization by 2050 for 1 in 50-year rainfalls and, (b) for disappearance of tanks, 1 in 50-year rainfall can inundate the city akin to 1 in 100-year rainfalls. The study can be useful for making informed decisions on dredging the tanks, land use planning, and flood control measures for the CMA.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12102875