Environment

New drainage plan considers impact of climate change

A plan for a new water-drainage network in HCM City has been submitted to the Prime Minister for approval.
New drainage plan considers impact of climate change ảnh 1HCM City's new drainage water plan will take into account the city’s expansion and the impact of climate change, erosion and rising sea levels. (Photo: VNA)

HCM City (VNS/VNA) - A plan for a new water-drainage network in Ho Chi Minh City has been submitted to the Prime Minister for approval.

The city has been using a water drainage plan approved in 2001 that covers thecentral area of about 650sq.km, which represents about 30 percent of the city'stotal area. The plan does not account for the impact of climate change, risingwater levels and erosion.

Without a comprehensive overhaul of the drainage network over the next 10years, the city would have to spend trillions of dong, so a new plan isessential, according to the ministry.

The new plan covers three times the area of the old plan, or about 2,100sq.km.It also includes studies of nearby provinces such as Dong Nai and Binh Duong.

Dang Phu Thanh, deputy chairman of the city’s Department of Construction, saidthat if the plan is approved, the city would refine the plan over the next ninemonths. Factors such as surface water, land and existing wastewater treatmentplans will be considered.

The department is working with consultancy experts from Denmark and Japan onthe drainage plan. Funding for the plan will come from the World Bank loans.

Dr Vu Ngoc Long, chairman of the Vietnam Institute of Ecology’s scientificcouncil, noted that Ho Chi Minh City is surrounded by Sai Gon, Dong Nai and VamCo rivers and has thousands of canals, ponds and lakes of various sizes.

Millions of square metres of lakes, ponds and canals have been buried to createland for development. For the water drainage plan to work effectively, the cityneeds to dredge existing canals to improve water flow and reopen as many buriedcanals as possible.

Architect Le Thanh Khai from the HCM City University of Architecture said thecity should avoid filling future canals and have more detention basins betweenresidential areas to reduce flooding.

The newly established Thu Duc city area is expected to have 10 percent of itsland as parks, and 30 percent of them will have detention basins, according tothe city's Department of Construction.

Because of heavy rains, land subsidence and high tides on the Sai Gon and Dong Nairivers, HCM City suffers from heavy floods every year.

According to the Ministry of Natural Resources and Environment, the city’srivers could rise by about 30cm by 2050 and 75cm by the end of the 21st century./.
VNA
#water-drainage network #Ho Chi Minh City #climate change #rising water levels #flooding #erosion #wastewater treatment plans #Vietnam News Agency #Vietnamplus
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