Making an underground tank not only prevents flooding when it rains but also stores water during drought. This is a comprehensive, visionary problem that needs to be consulted with a geologist.
Build anti-flooding underground tanks
Reporting at the May meeting of the Hanoi People’s Committee, Director of the Department of Construction Vo Nguyen Phong continued to propose solutions to solve the problem of flooding in the inner city and some areas. inherent in heavy rain.
Accordingly, the Hanoi Department of Construction proposed to coordinate with the Department of Agriculture and Rural Development and drainage units and irrigation companies to report to the City People’s Committee to study and propose immediate and long-term solutions (first and foremost). invest in pumping stations for urban drainage; water storage tunnels in low-lying areas to reduce local flooding; upgrade drainage systems in the left Nhue, Huu Nhue, and the North Red River basins, etc.).
In the immediate future, it is necessary to study and build an additional urban drainage system on the road that collects Thang Long Boulevard and solutions for local depressions in underground tunnels.
Mr. Phong proposed to assign Hoan Kiem District People’s Committee to study and implement a plan to build an underground regulating tank to store rain water at the intersection of Bat Dan – Duong Thanh, as he did similar to an underground regulating tank on Nguyen Khuyen street, in front of the Ly Thuong Kiet Secondary School.
The peak was Typhoon Mireilles in September 1991, which flooded 30,000 houses and 100km² in the suburbs of Tokyo, killing 52 people. Therefore, the Japanese Government urgently studies the construction of the G-Cans system, consisting of many tunnels and water tanks located deep underground, underneath football fields and parks.
Sanno reservoirs or G-Cans system have helped improve drainage capacity, ensuring the cities mentioned above to withstand heavy rains. The proof is that since the completion of the Sanno regulation reservoir (in 2012) until now, Fukuoka City has not been flooded like in previous years, especially Hakata station has never been flooded.
Many problems need to be solved
Architect Pham Thanh Tung – Chief of Office of Vietnam Association of Architects, the key issue for the future is still planning underground space to make storage tanks, this is very important. Making an underground tank not only prevents flooding when it rains but also stores water during drought. This is a comprehensive, visionary problem that needs to be consulted with a geologist.
Need to solve the drainage problem for the Capital soon
According to the expert, the immediate problem to prevent flooding is to limit the concreting of Hanoi’s streets. Many streets of Hanoi are full of high-rise buildings, but underground sewers have not been calculated. Now is still the old sewer system, not yet connected harmoniously. Hanoi is paying the price for concreting to fill a lot of “bags of water” (ponds, lakes). In 2008, the rain lasted one day and night flooded the whole city for many days.
However, in fact, in Vietnam, Ho Chi Minh City had previously learned from experience and built a pilot reservoir containing underground water with a capacity of about 100m3 using “cross-wave” materials to prevent flooding. However, the situation of Ho Chi Minh City in recent years is not much better than before.
Meanwhile, looking at the problem of Hanoi broadly, experts say that the most worrying thing about Hanoi right now is that water supply and drainage has not been improved but is preparing to fill a lot of ponds and lakes.
According to the map of the land use plan of Hanoi in 2020, many lakes in the capital are about to be filled to build houses and roads. For example, in Hoang Mai district, the lake opposite Mega Market at 126 Tam Trinh can be leveled to build the TDC apartment and public service project (Lucky House); The lake near the hospital for treating Covid-19 patients was leveled to build the Tan Hoang Mai urban area construction project; a part of Thanh Tri lake will be leveled to build roads and houses with an area of about 1.8 hectares.
In Long Bien, there are Xuan Que and Son Thuy lakes (also known as Ba Do lakes) to build technical infrastructure and create a land fund for auction of land use rights.
According to architect Tran Huy Anh, Standing member of the Hanoi Association of Architects, the reality of the capital is that when Hanoi expanded its inner city, many low-lying areas were leveled. New urban areas such as Linh Dam, Ha Dong, Nam Tu Liem, Cau Giay mostly spring up in low-lying areas, new lake digging projects are behind schedule, leading to increasingly serious flooding.
This is also the basis for raising concerns that many lakes in Hanoi are about to be filled for urban projects, which may lead to rainwater overflowing into the streets causing flooding.
Source: CafeF
