The projects, managed by the Hanoi Infrastructure and Agriculture Construction Investment Project Management Board, form part of the city's efforts to address chronic flooding and improve urban infrastructure.
Tran Van Tien, deputy director of the project board, said construction began shortly after sites were handed over in February and necessary conditions were met in March.
Several components have already entered operation and contributed to drainage efforts during heavy rainfall in May, he said.
The seven projects have reached about 90 per cent completion, representing more than VND 4 trillion (USD 152 million) worth of completed work after less than four months of construction.
Tien described the pace as exceptional compared with similar public infrastructure projects, which typically require two to three years to complete.
The projects include upgrades to retention lakes, canals and drainage infrastructure designed to improve the city's capacity to cope with heavy rainfall.
Construction crews have worked around the clock, including overnight shifts and weekends, while city authorities have closely monitored progress and helped resolve obstacles to keep the projects on schedule.
The works have faced a range of challenges, including the relocation of underground and above-ground utilities, shortages of construction materials and labour, rising fuel costs and disruptions caused by extreme weather.
According to Tien, prolonged heatwaves in May affected construction activities, with more than 40 workers on the Thuy Phuong Canal project reportedly unable to work at certain times because of heat-related illnesses.
Heavy rain also forced temporary suspensions of construction so workers and equipment could assist with the city's broader drainage operations.
Contractors are now racing to complete the remaining work before June 30 so the projects can be fully integrated into Hanoi's drainage network before the peak rainy season.
City authorities have identified flood prevention as one of the key infrastructure priorities for the 2026-2030 period.
