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| Meteorological history | |
|---|---|
| Duration | 26–27 July 2005 |
| Overall effects | |
| Fatalities | 1094[1] |
| Areas affected | Maharashtra inclusive of Mumbai |
The 2005 Maharashtra floods impacted many parts of the Indian stateofMaharashtra including large areas of the metropolis Mumbai, a city located on the coast of the Arabian Sea, on the Western coast of India, in which approximately 1,094 people died. It occurred just one month after the June 2005 Gujarat floods. The term 26 July, is used to refer to the day when the city of Mumbai came to a standstill due to flooding.
Many people were stranded on the roads, lost their homes while many walked long distances back home from work that evening. The floods were caused by the eighth heaviest-ever recorded 24-hour rainfall figure of 944 mm (37.17 inches) which lashed the metropolis on 26 July 2005, and intermittently continued for the next day. 644mm (25.35 inches) was received within the 12-hour period between 8 am and 8 pm. Torrential rainfall continued for the next week. The highest 24-hour period in India was 1,168 mm (46.0 inches) in Aminidivi in the Union TerritoryofLakshadweep on 6 May 2004 although some reports suggest that it was a new Indian record. The previous record high rainfall in a 24-hour period for Mumbai was 575 mm (22.6 inches) in 1974.
Other places severely affected were Raigad, Chiplun and Khed, Guhagar.
On 26 July 2005, around 2:00 pm, the Mumbai Metropolitan Region was struck by a severe storm and subsequent deluge. The Indian Meteorological Department (IMD) station in Santacruz recorded 944 millimetres (37.2 in). This is the wettest day on record in Mumbai.[2]
Local train movement came to a halt by 2:30 p.m. due to the water-logging on the tracks. This caused traffic on roads to increase dramatically with water logging and submerging of certain low-lying pockets of the region, such as Dharavi and Bandra-Kurla Complex.
Thousands of school children were stranded due to flooding and could not reach home for up to 24 hours. The following two days were declared as school and college holidays by the state government.
The rain water caused the sewage system to overflow and all water lines were contaminated. The Government ordered all housing societies to add chlorine to their water tanks.
The financial cost of floods was unprecedented and these floods caused a stoppage of entire commercial, trading, and industrial activity for days. Preliminary indications indicate that the floods caused a direct loss of about ₹5.50 billion (€80 million or US$100 million). The financial impact of the floods were manifested in a variety of ways:
The present storm-water drainage system in Mumbai was put in place in the early 20th century and is capable of carrying only 25.1237 millimetres of water per hour which was extremely inadequate on a day when 993 mm of rain fell in the city. The drainage system was also clogged at several places.
Only 3 'outfalls' (ways out to the sea) are equipped with floodgates whereas the remaining 102 open directly into the sea for more than 24 hours. As a result, there is no way to stop the seawater from rushing into the drainage system during high tide.
In 1990, an ambitious plan was drawn to overhaul the city's storm water drainage system which had never been reviewed in over 50 years. A project costing approximately 6 billion rupees was proposed by UK based consultants hired by the Brihanmumbai Municipal Corporation to study the matter. Implementation of the project would have ensured that rainwater did not flood the streets of Mumbai. The project was planned to have completed by 2002 and aimed to enhance the drainage system through larger diameter storm water drains and pipes, using pumps wherever necessary and removing encroachments. The project, if implemented would have doubled the storm water carrying capacity to 50 mm per hour.
The BMC committee had rejected the proposed project on the grounds that it was "too costly". These were few of the drawbacks due to which the city suffered so gravely.
Development in certain parts of Mumbai is haphazard and buildings are constructed without proper planning. The drainage plans in northern suburbs is chalked out as and when required in a particular area and not from an overall point of view.
The Environment Ministry of the Government of India was informed in the early 1990s that sanctioning the Bandra-Kurla Complex,a commercial complex in northern Mumbai was leading to disaster. No environment clearance is mandatory for large urban construction projects in northern Mumbai. Officials in the environment ministry claimed that it was not practical to impose new guidelines with retrospective effect "as there are millions of buildings".
Mangrove ecosystems which exist along the Mithi River and Mahim Creek are being destroyed and replaced with construction. Hundreds of acres of swamps in Mahim creek have been reclaimed and put to use for construction by builders. These ecosystems serve as a buffer between land and sea. It is estimated that Mumbai has lost about 40% of its mangroves between 1995 and 2005, some to builders and some to encroachment (slums). Sewage and garbage dumps have also destroyed mangroves. The Bandra-Kurla complex in particular was created by replacing such swamps. Mindspace CBD (Inorbit Mall) in Goregaon & Malad has been built by destroying a large patch of mangroves in Maharashtra.
The floods have been the subject of research by scientists and social scientists attempting to understand the causes, impacts, and short/long term consequences. Scholars have studied the floods in Mumbai from the perspectives of climate change, disaster management / mitigation, urban health, vulnerability and adaptation, hydrology, environmental degradation and encroachment etc. Kapil Gupta (2007) assesses urban flood resilience, while Andharia (2006) contrasts the "widespread acts of generosity and altruism" in Mumbai with the general social disorder that was seen in the aftermath of Hurricane KatrinainNew Orleans. Aromar Revi (2005) draws lessons from the floods for prioritising multi-hazard risk mitigation. Parthasarathy (2009) links social and environmental insecurities to show that the most marginalised groups were also the most affected by the floods.
Climate change has played an important role in causing large-scale floods across central India, especially the Mumbai floods of 2005. During 1901–2015, there has been a three-fold rise in widespread extreme rainfall events, over the entire central belt of India from Mumbai to Bhubaneshwar, leading to a steady rise in the number of flash floods.[4] The rising number of extreme rain events are attributed to an increase in the fluctuations of the monsoon westerly winds, due to increased warming in the Arabian Sea. This results in occasional surges of moisture transport from the Arabian Sea to the subcontinent, resulting in widespread heavy rains lasting for 2–3 days. The Mumbai 2005 floods also occurred due to moisture surge from the Arabian Sea, and the heavy rains were not confined to Mumbai but spread over a large region across central India.[4]
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