Ahmedabad: ‘Ecological solutions needed more than drains’ | Ahmedabad News

AHMEDABAD: If the recent extreme weather events in Ahmedabad – high temperatures between March and May, erratic monsoon rain and urban floods – are any indication, the city is in trouble. A study now says the city needs a better blue-green infrastructure (BGI) network, a combination of developing and integrating more lakes, gardens, open spaces with existing civic infrastructure for ecological restoration.
The researchers, Ravnish Kaur and Kshama Gupta of the Indian Institute of Remote Sensing, Dehradun, say that the existing stormwater drain network can serve just 55% of the city leaving many areas to vulnerable to urban floods. With the climate crisis footprint becoming larger every year, it is now vital for Ahmedabad, its citizens, and its planners to adapt to the vagaries of the climate crisis.
Each year 40% of the average annual rainfall flows away as surface run-off in the city. Many areas of the city are left waterlogged and that is mainly due to the insufficient capacity of drains as they are designed for 20% to 25% of peak rainfall.
“Ahmedabad thus requires a well-defined BGI network, where existing gardens and lakes can act as natural basins for the retention of stormwater, while excess water can finally be discharged into the Sabarmati,” the study says.
The study points out that the western side of the city slopes down from north to south and from west to east while the eastern side slopes down from east to eest towards the Sabarmati River.
Ahmedabad has very less green cover (12.3%) and blue infrastructure or lakes (2.2%), the latter is degrading continuously. The study cited the examples of Vancouver and Copenhagen, where city-wide strategies to mitigate urban floods through nature-based stormwater management have been implemented.
Another possible solution the study mentions is integrating blue- green practices across barren surfaces of the city (34.7%) and road networks (8.8%) to reduce the imperviousness factor of Ahmedabad and encourage greater absorption of water.

Source link

Leave a Comment