Here, water flows from A 24 (manhole) to A 23. The most prominent reverse flow was identified at GN Chetty Road. #ChennaiRains /XqTusdcHM8- Lakshmy Venkiteswaran November 22, 2021
Ragaviah Road, Bazullah Road, Sadasivam St, Tilak St, and Tilak St extn - all near Usman Road, T.nagar, water-logged. Map of T Nagar's stormwater drain system released by GCC In T Nagar, reverse flow has been found on Raghaviah Road, Thirumalai Pillai Road, Vijaya Raghava Road, Gopalakrishnan Road, Rama Street, and a big stretch of GN Chetty Road. "In all these areas, water is moving from a lower SWD to a higher SWD and therefore water has to climb uphill to flow," he adds. But in T Nagar, unaligned storm water drains have led to water logging due to reverse flow in over 11 streets. A 'contour study' marks points of equal height on a map, and drains need to be built in a way that that water flows from the higher surfaces or gradient to lower levels (expressed in Mean Sea Level or MSL) until it finally reaches a natural water channel which is on the lowest MSL, explained Dayanand. However, it is unclear whether T Nagar's terrain and elevation levels were studied before constructing the Storm Water Drain (SWD) system, as many of the drains have been found to lie outside the contour line.ĭayanand studied the storm water drains of T Nagar and Ashok Nagar and realised that the drains were built without alignment after a contour study of the area. It is based on how much rainfall is received that the capacity of the drain is fixed,” Dayanand Krishnan, civil engineering expert and Geographic Information System (GIS) consultant told TNM. “Many aspects such as terrain, elevation levels, amount of rainfall runoff and the location of natural water channels have to be studied before designing stormwater drains. However, a quick look at T Nagar’s SWD map shows that an uneven drain network and inadequate size of some of the drains triggered waterlogging. The function of stormwater drains is to collect rain water runoff from roads and concrete surfaces and direct it to the nearest natural channel of water, ensuring that water doesn’t stagnate on the streets.
To counter public outrage, the GCC released maps of the stormwater drain (SWD) networks in all the 200 wards of the city for the first time.
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