GUWAHATI, June 26 - Following a study of the city's flooding problem, first by an engineering firm and then by IIT Guwahati, the Guwahati Metropolitan Development Authority (GMDA) has built a network of drains to prevent stormwater from flowing into the Bharalu rivulet.
"The construction of the Noonmati basin drain was taken up as per a survey by Tahal Consulting Engineers Limited. It had suggested diversion of stormwater, which was coming towards Bharalu, to reduce the load on the river. Later, the GMDA engaged IIT Guwahati also for a detailed study and advice," GMDA CEO M Angamuthu told The Assam Tribune.
On this concept, the construction of the Noonmati basin drain was taken up to divert the stormwater towards Bondajan side and finally to discharge it into the Brahmaputra from the Jyotinagar Hill catchment area and Mathgharia catchment areas - which are two major sources of stormwater flowing into the Bharalu.
The total length of the drain is 5,000 metres and its width varies from 3 m to 6.50 metres.
One of the legs (part I) starts from Bamunimaidam (behind the FCI godown) to Bondajan and another leg (part II) starts from Mathgharia hills to Bondajan.
For diversion of stormwater from the Bamunimaidam side, intermediate pumping system with four pumps is being installed.
"It is expected that approximately 8 cumec (cubic metre per second) water load will be reduced on the Bharalu rivulet," Angamuthu said.
A box drain is also being constructed on FA Road (Panjabari) to link the existing PWRD roadside drain to the Silsako water body. The total length of this drain is 490 metre. "This will facilitate discharge of stormwater from Kalakshetra area to Silsako Beel," the CEO said.
The network of drains has been built at a cost of Rs 33 crore.
Dr Angamuthu said the GMDA has been also entrusted with the job of desilting various water-bodies and channels in the city. "Periodical cleaning and desilting of the water-bodies is being done by deploying GMDA's excavators, weed harvesters and amphibian dredgers, thus increasing the retention capacity of the water bodies as well as free flow of water from city areas to the Brahmaputra. There are three outlets to discharge the rainwater from Guwahati city - the Bharalu rivulet, the Silsako-Bondajan channel and the Pamohi-Deepor Beel-Khanajan channel. The last two channels are maintained for free flow of water by GMDA," he added.