Urban flooding is the inundation of land in a built environment, most notably in heavily populated areas. It occurs when rainfall or other events exceed the capacity of drainage systems. Flooding has become a big issue in several Indian cities recently.
This topic is of immense importance to candidates appearing for the IAS Exam this year as questions related to Urban Flooding in India can potentially be asked from the Public Administration segment.
Flooding in cities is a serious concern in many regions of the world, and it is a natural calamity that occurs every year. The rise in sea levels caused by global warming is just exacerbating the situation. Although it is widely assumed that metropolitan areas near floodplains are the most vulnerable, there are other factors at work. Among these factors are the following:
- Flash-floods
- Glaciers Melting
- Water released from damaged sewer systems
- Overflow from drainage
Flood effects in metropolitan areas can be increased by existing paved streets and highways, which enhance the speed of flowing water. Impervious surfaces prevent rainfall from penetrating the earth, resulting in an increased surface run-off that may exceed local drainage capacity.
Flooding in cities is a severe issue since cities house key economic infrastructure that must be protected at all times. Any destruction or loss of these critical facilities will result in massive economic losses. Furthermore, it will result in the loss of life and property, as well as a significant amount of resources when they are used to relocate people to safe locations.
Urban Flooding in India
Floods in India have recently increased, wreaking havoc on major cities. Some of the most catastrophic urban flooding episodes have occurred in Mumbai in 2005, Kolkata in 2007, Delhi in 2009, Bangalore in 2015, and Hyderabad in 2020.
Flooding in India peaks during the monsoon season. Storm surges in coastal cities can also create flooding at times. Failure to discharge water from dams can also have a significant impact. Furthermore, the urban heat island effect has increased rainfall over urban regions. Global climate change is causing weather patterns to shift and more high-intensity rainfall events to occur in shorter periods of time. Then there’s the problem of sea-level rise, which threatens all coastal cities.
Factors Leading to Urban Flooding in India
Urban flooding in India is caused by a variety of factors, some of which are as follows:
- Stormwater drainage systems whose capabilities are exceeded when heavy rainfall occurs.
- Cities’ haphazard and irregular planning is exacerbated by issues of unlawful encroachment, which eliminates natural watercourses required to drain excess water.
As a result, the capacity of natural drains has been reduced, causing flooding. Improper solid waste disposal, including domestic, commercial, and industrial garbage, as well as dumping construction debris into drains, all contribute considerably to their capacity reduction. It is critical to improving operations and maintenance procedures.
The problem will further worsen as rapid growth in population leads to industrial-scale urbanization.
Steps Taken to Mitigate Urban Flooding
Building away from floodplains and high flood hazard zones is one of the best ways to lessen the likelihood of flooding. It is difficult to locate such zones and water bodies, but geospatial analysis can be of great assistance in doing so.
New buildings in flood-prone locations, as well as in places where development has already been completed or encroached upon, must be rigorously monitored and managed. Structural flood mitigation solutions, such as expanding stormwater drainage capacitors, must be considered.
Government efforts such as the Sponge Cities Mission and the Atal Mission for Rejuvenation and Urban Transformation (AMRUT) can assist civic authorities in planning cities with flood concerns in mind. Furthermore, residential and commercial stakeholders can be encouraged to develop green infrastructures such as rain gardens, green roofs, and rainwater harvesting systems.
These systems, in addition to minimizing flood hazards, store water for drier seasons and aid in groundwater recharge. It is only prudent to invest in making our communities more resilient so that when calamity comes, we can return to normalcy with as little loss of life and property as possible.
