Showing posts with label water drainage. Show all posts
Showing posts with label water drainage. Show all posts

Friday, December 10, 2010

City urged to hasten flood-control projects

Workers build a water drainage outlet on the right bank of the Sai Gon River in HCM City. Authorities have been asked to speed up such projects to reduce flooding. — VNA/VNS Photo Van Khanh

Workers build a water drainage outlet on the right bank of the Sai Gon River in HCM City. Authorities have been asked to speed up such projects to reduce flooding. — VNA/VNS Photo Van Khanh

HCM CITY — Deputy Secretary of the HCM City Party Committee Nguyen Van Dua has asked relevant units and agencies to speed up water drainage projects to reduce flooding in the city.

Speaking at a meeting on Wednesday, Dua said infrastructure project contractors and managers found responsible for blocking sewage drains during their project implementation would be strictly penalised.

Nguyen Phuoc Thao, director of the HCM City Regulation Centre for Flood Prevention Programme, said flood mitigation in the city was difficult because of the unusual weather, rising tide levels, illegally built houses encroaching on canals and drainage sluices, and ongoing infrastructure projects that block sewage drains in inner city areas.

The contractors had ignored the authorities' demands to unblock the sewage drains, Thao said.

So far this year, 274 blocked sewage drains have been found.

About 230 have been completely unblocked, 12 have been partially unblocked and 28 are still blocked.

Three quarters of Binh Thanh District lies below the peak high tide level and is subject to severe flooding during high tides and heavy rains.

In the district's Thanh Da peninsula, the water level nearly reaches the top of embankments that need to be raised.

Le Thanh Hai, Secretary of the HCM City Party Committee, ordered investors of flood prevention projects to research measures for consolidating key river embankments in the city to ensure safety and prevent houses being flooded.

Hai told the HCM City People's Committee to ask local and foreign experts to research the future strain that climate change would put on the city's drains.

He also ordered the HCM City Regulation Centre for Flood Prevention Programme and the city's Department of Agriculture and Rural Development to research using concrete or PVC plastic posts to build embankments.

Concrete or PVC plastic posts would be more expensive than cajeput stakes, but they would improve the quality of embankments, he said. — VNS

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Saturday, October 2, 2010

Ha Noi to address city's drainage

Pump maintenance is carried out at Thuong Le Pumping Station in Me Linh District in Ha Noi. The Prime Minister asked the city planners to draft a sewage plan that could manage the annual heavy rainfail. — VNA/VNS Photo Xuan Truong

Pump maintenance is carried out at Thuong Le Pumping Station in Me Linh District in Ha Noi. The Prime Minister asked the city planners to draft a sewage plan that could manage the annual heavy rainfail. — VNA/VNS Photo Xuan Truong

HA NOI — A recent Prime Ministerial Decision has asked the Ha Noi People's Committee to compile a comprehensive proposal on water drainage planning until 2030 with a vision towards 2050.

The full-scale planning would be conducted on the capital's entire footprint, including new districts that were incorporated in 2008. Experts have been asked to design a water drainage system that would function over the -3,350-sq.m area, home to about 6 million residents.

Planning for the water drainage system would have to comply with the city's master plan, the decision said.

City planners were asked to carry out a comprehensive study on the existing drainage system and to incorporate computer weather models into their analysis to offer a comprehensive solution for drainage management in the city.

One component of the planning would focus on rainwater drainage with the aim of mitigate flooding in central areas of Ha Noi and gradually preventing any floods due to heavy rainfall.

Bui Huu Doan, deputy head of the Ministry of Construction's Technical Infrastructure Department, said the existing drainage situation in Ha Noi was defective and inadequate, a fact that was acutely evident during periods of heavy rainfall.

Deputy General Director Nguyen Xuan Dieu of the Ministry of Agriculture and Rural Development's Irrigation Department said that in addition to the low capacity of pumping stations, another problem was the collection of stagnant water that could not flow into lakes or rivers due to blocked outlets.

Last July, a three-hour downpour dumped 130mm of rain and flooded many areas of the city, which clearly demonstrated the low capacity of the city's water drainage system.

However, the situation was far better than the flooding in early November 2008 when all city streets were submerged in water due to the record 500mm downpour in the urban area.

Doan said most projects were focused on renovating the existing system rather than creating an entirely new one.

The existing system didn't separate rainwater runoff and sewage. Nor did the designers of the old system take into account the maximum rainfall or drainage pressure, he said.

The committee must finish its tasks by June. — VNS

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