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Experts suggest steps to tackle flash flood

By Ajit patowary

GUWAHATI, May 1 � Water Resources Department (WRD) sources here are of the view that the Bharalu should be provided with a pump house of the capacity to pump out 6,000 litres per second to get rid of the flash flood problem in Anil Nagar, Nabin Nagar and adjacent areas.

They also called for steps to enhance the drainage capacity of the PWD drain along the rail track and silt traps at suitable locations to confine the heavy silt load carried by the Chandmari hill stormwater runoff for saving the Maniram Dewan Road areas from flash flood.

The stormwater runoff from the Chandmari hill is heavily loaded with silt due to the human settlements on the hill areas and this silt load is clogging the roadside drains of along the MRD Road. The PWD drain running along the rail track is also clogged by a part of this silt.

It is expected that the completion of the Refinery drain will help in reducing at least 30 per cent of stormwater runoff received by the Bharalu.

A portion of the Chandmari hill stormwater runoff, routing through the Anil Nagar drain, and the RG Baruah Road stormwater flowing through the Nabin Nagar drain, use to inundate the Anil Nagar and Nabin Nagar areas. These two areas were recently built up on a marshy part of the city.

The PWD has dug two new drains to drain out the Gandhi Mandap catchment stormwater via Anil Nagar and Lachit Nagar, which has compounded the problems in the Anil Nagar area.

All these have rendered the two trolley pumps and the two submersible pumps, installed by the WRD in the Anil Nagar, Tarun Nagar and Lachit Nagar areas, redundant. Together, these pumps can pump out 750 litres of water per second, said the sources.

Flash flood in the city�s Maniram Dewan (MRD) Road area is the product of the lack of capacity of the PWD drain laid along the rail track to drain out the stormwater runoff from the Chandmari hill. Besides, the mouth of the drain is under heavy encroachment from the Guwahati Club-Ambari point, said the WRD engineers here.

The MRD Road area of the city receives the stormwater runoff of the Chandmari hill through the main drain running along the western boundary of the Guwahati Station of the All India Radio, and the Pension Para and Navagraha drains.

In the Christian Basti area, the problem of flash flood is created by the encroachment on the Narakasur hill.

In the Jatiya area of the city, the PWD is laying a drain to connect the roadside drain with the Lakhimijan�the diversion channel of the Basistha river, at Lakhiminagar, near the Rajdhani Masjid, to solve the problem of inundation in the Ganeshguri-Ganesh Mandir area.

However, the Hatigaon course of the Basistha river, which is the original course of the river, is under tremendous pressure from the encroachers, particularly between the starting of the diversion channel to Lakhiminagar entry point at Hatigaon�around 2,270 metres stretch in length.

The encroachment on the channel has reduced its width to two to three metres. The channel was around ten metres wide. This reduced width of the channel is creating the problem of flash flood in the Dispur Last Gate area, said the WRD sources.

To solve the Dispur flash flood problem, the mouth of Hatigaon channel at Natboma near Dakhingaon, should be provided with a two-barrel sluice culvert. This will provide the channel the required carrying capacity, said the sources.

For solving the problem of flash flood in the Panbazar, Lakhtokia etc areas of the city, there is also a need to maintain the gradient of the Mora Bharalu River. This river is now carrying water only after the pressure created in the Bharalu river under the 42 cumec discharge load.

The Basistha river is also facing another problem near the Inter State Bus Terminus (ISBT) at Betkuchi due to the raised floor of the RCC Bridge built by the NHAI on the NH-37 bypass. This has necessitated diversion of the Basishtha channel by the WRD behind the ISBT about two months back.

The original course of the Basistha river is also highly disturbed between Boragaon and Deepor Beel. The civil authorities should take up the issue in due earnest, said the WRD sources.

On the problem of flash flood in the Panjabari area of the city, WRD sources said that encroachment on the natural channel Juri in an around 8 km stretch, has created the problem.

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Experts suggest steps to tackle flash flood

GUWAHATI, May 1 � Water Resources Department (WRD) sources here are of the view that the Bharalu should be provided with a pump house of the capacity to pump out 6,000 litres per second to get rid of the flash flood problem in Anil Nagar, Nabin Nagar and adjacent areas.

They also called for steps to enhance the drainage capacity of the PWD drain along the rail track and silt traps at suitable locations to confine the heavy silt load carried by the Chandmari hill stormwater runoff for saving the Maniram Dewan Road areas from flash flood.

The stormwater runoff from the Chandmari hill is heavily loaded with silt due to the human settlements on the hill areas and this silt load is clogging the roadside drains of along the MRD Road. The PWD drain running along the rail track is also clogged by a part of this silt.

It is expected that the completion of the Refinery drain will help in reducing at least 30 per cent of stormwater runoff received by the Bharalu.

A portion of the Chandmari hill stormwater runoff, routing through the Anil Nagar drain, and the RG Baruah Road stormwater flowing through the Nabin Nagar drain, use to inundate the Anil Nagar and Nabin Nagar areas. These two areas were recently built up on a marshy part of the city.

The PWD has dug two new drains to drain out the Gandhi Mandap catchment stormwater via Anil Nagar and Lachit Nagar, which has compounded the problems in the Anil Nagar area.

All these have rendered the two trolley pumps and the two submersible pumps, installed by the WRD in the Anil Nagar, Tarun Nagar and Lachit Nagar areas, redundant. Together, these pumps can pump out 750 litres of water per second, said the sources.

Flash flood in the city�s Maniram Dewan (MRD) Road area is the product of the lack of capacity of the PWD drain laid along the rail track to drain out the stormwater runoff from the Chandmari hill. Besides, the mouth of the drain is under heavy encroachment from the Guwahati Club-Ambari point, said the WRD engineers here.

The MRD Road area of the city receives the stormwater runoff of the Chandmari hill through the main drain running along the western boundary of the Guwahati Station of the All India Radio, and the Pension Para and Navagraha drains.

In the Christian Basti area, the problem of flash flood is created by the encroachment on the Narakasur hill.

In the Jatiya area of the city, the PWD is laying a drain to connect the roadside drain with the Lakhimijan�the diversion channel of the Basistha river, at Lakhiminagar, near the Rajdhani Masjid, to solve the problem of inundation in the Ganeshguri-Ganesh Mandir area.

However, the Hatigaon course of the Basistha river, which is the original course of the river, is under tremendous pressure from the encroachers, particularly between the starting of the diversion channel to Lakhiminagar entry point at Hatigaon�around 2,270 metres stretch in length.

The encroachment on the channel has reduced its width to two to three metres. The channel was around ten metres wide. This reduced width of the channel is creating the problem of flash flood in the Dispur Last Gate area, said the WRD sources.

To solve the Dispur flash flood problem, the mouth of Hatigaon channel at Natboma near Dakhingaon, should be provided with a two-barrel sluice culvert. This will provide the channel the required carrying capacity, said the sources.

For solving the problem of flash flood in the Panbazar, Lakhtokia etc areas of the city, there is also a need to maintain the gradient of the Mora Bharalu River. This river is now carrying water only after the pressure created in the Bharalu river under the 42 cumec discharge load.

The Basistha river is also facing another problem near the Inter State Bus Terminus (ISBT) at Betkuchi due to the raised floor of the RCC Bridge built by the NHAI on the NH-37 bypass. This has necessitated diversion of the Basishtha channel by the WRD behind the ISBT about two months back.

The original course of the Basistha river is also highly disturbed between Boragaon and Deepor Beel. The civil authorities should take up the issue in due earnest, said the WRD sources.

On the problem of flash flood in the Panjabari area of the city, WRD sources said that encroachment on the natural channel Juri in an around 8 km stretch, has created the problem.