Hyderabad: The city has grown 16.5% in the past 20 years, but this rapid urbanization has produced a changing topography that fails to bear the attack of small monsoon rain, causing flooding and misery.
A study study, based on satellite data from 2000 to 2020, revealed that there was an uncontrolled urbanization, which led to higher flooding volumes and more flood episodes.
This research was conducted by researchers from the National Institute of Technology (NIT), Warangal, comparing the two main episodes of urban floods – August 2000 and October 2020 – in Hyderabad.
The risk between 2000 and 2020 flood shows rose 50%.
According to research, urbanization that was not planned quickly, ignoring the regional and local hydrological landscapes had worsened the severity of the flood.
“Uncontrolled urbanization (an increase of 16.5%) over the past two decades has substantially influenced urban hydrology, producing a higher flood volume for relatively small rainfall events,” said this research, emphasizing the need to “regulate urbanization, providing capacity Enhanced disposal, rejuvenate it.
Water and flow bodies “to check and reduce spatial flood levels.
Apart from Nit, Warangal researchers, those from Sree Vidyanikethan Engineering College, Tirupati, and Indian Institutes of remote sensing, Dehradun, are also part of the research published in the problem of ‘Science’ today ‘recently.
This team consists of Vinay Ashok Rangari, CM Bhatt and NV Umahesh.
Although Hyderabad did not record the amount of quantum rainfall obtained in September 1908 which resulted in Musi floods in the last 113 years, the severity of the flood has increased.
This researchers are associated with city growth and unplanned water body encroachment.
“August 2000 flood (241.5 mm rainfall in 24 hours) caused loss of large properties and more than 90 housing colonies sinking (water level 2 to 4 meters).
Hyderabad witnessed another intense rain on October 13, 2020, and the event pointed at persistent warnings that people choose to ignore these years …
massive floods …
have an impact of more than 120 colonies, 20,500 houses and causing as many as 80 deaths, “the researchers said.
Satellite data shows a significant reduction in open soil and the overall decline in the amount of water and its spread.
The researchers focused on the zone-12 consisting of Begumpet, Ameerpet, Madhapur, Kukatpally, Rajiv Gandhi Nagar, Chandra Nagar, Tulanasi Nagar and Laxmi Nagar.
Zone-12 has 65% area resistant to 2000.
Now it has increased to 89%.
This, in other words, means watching a conceitization of 23.75% in the past 20 years.
“Increasing roundness occurred in the cost of encroachment of vegetative areas, PARSA open soil and water bodies of 0.95%, 15% and 0.65%.
The increase in both of them limits the infiltration process, thus increasing total runoff from urbanization catches up to six times and peak flows up to 1.8 to 8 times, so that they lead to floods, “said this study.
The study revealed that in October 2020 rainfall events, water began to accumulate around seven hours of rainfall in the area along the streamline.
The water level began to stack up with a pass which caused the spread of flood water next to it side by side with around 14 hours.
“We can observe a more than 50% increase in high risk for the October 2020 event.
Similarly, there is a significant increase in low and medium risk compared to the August 2000 event,” added the researchers.