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The historic downpour on Could 29, with the best rain degree seen since 1986, flooded over 100 places within the capital. Because the local weather disaster progresses, together with a rising inhabitants and rising burden on infrastructure, specialists say Hanoi would quickly want an answer to successfully take care of floods and inundations.
Tran Duc Ha, head of the Water Provide and Sewerage Analysis Institute, mentioned establishing reservoirs may very well be scaled up. Hanoi at the moment has one trial reservoir of two,000 cubic meters for Nguyen Khuyen Avenue. Such a mannequin has already been utilized in Hong Kong, he mentioned.
Reservoirs are sometimes used to resolve native inundations. To decide on an acceptable location, authorities want to find out particular areas liable to flooding, in addition to splendid localities to construct reservoirs. These places may embody massive grass or soccer fields, he added.
When it rains, the water would stream towards reservoirs as an alternative of flooding the streets.
“The saved water may very well be used for irrigation, firefighting or be processed into faucet water,” Ha mentioned.
In Hong Kong, one such reservoir is positioned beneath Comfortable Valley. The reservoir has a capability of 60,000 cubic meters, is located beneath 5 soccer fields and has significantly contributed to Hong Kong’s anti-flooding efforts.
Ha mentioned reservoirs and sewage techniques ought to be separated. A sewage system would function on a a lot bigger scale and be costlier. They’re sometimes related to therapy crops and direct water towards rivers and lakes.
Rainwater would stream on to rivers and lakes, whereas wastewater could be handled first, stopping air pollution.
Tokyo has one of the vital superior sewage techniques, with its Metropolitan Space Outer Underground Discharge Channel (MAOUDC) thought of one of many world’s largest anti-flooding buildings.
The system drains water from small- and medium-sized rivers in northern Tokyo, feeding 5 reservoirs. The water from the reservoirs are pumped by means of a 6.3-kilometer tunnel in the direction of Edo River at 200 cubic meters per second.
If the water degree in Edo River will get too excessive, MAOUDC would decelerate the stream in response.
Nguyen Van Lien, former Minister of Development, mentioned crucial issue is an area for water to be drained away, utilizing supplies that take up water nicely, whereas increasing grassland areas and water our bodies.
The strategy Lien was referring to is named a “sponge metropolis”, an city building mannequin for flood administration specializing in ecological infrastructure. As an alternative of draining all of the water away, such a mannequin would both retain among the rainwater for agricultural functions or deal with it as an alternative. Beijing and Shanghai are two examples of utilizing such a mannequin for flood administration.
Cities can apply the mannequin just by planting extra bushes on rooftops, constructing extra reservoirs, utilizing water-absorbent supplies for roads and increasing ponds and lakes.
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