Years collects the water equivalent of 200 in Kunming Lake in Beijing Beijing, rainwater harvesting | _ news

Beijing News dispatch (reporter Rao Pei) with plain afforestation project, heavy use of rainwater utilization facility in Beijing, permeability, storage store each year, covering more than preliminary estimates that some 100 million cubic meters of groundwater, the equivalent of 200 Kunming Lake.

　　Completed construction of Lake wetland 3000 hectares

Green rainwater Conference held yesterday, Beijing Municipal Bureau of landscape presentation, this year is the third year of implementation of plain afforestation project in Beijing, heavy use of rainwater utilization facility, Greenland has become pieces of plain afforestation water "sponge".

Afforestation in the plain, through the use of low-lying land, pond Lotus root, recover for Lake wetland, has completed construction of 3000 hectares, the future will be build 1000 hectares, can be set to about 10 million cubic meters of rain and flood storage. Covering ground at the same time, ease flood pressure. Moreover, the implementation of 1720 hectares of sand control and at the pit bottom construction of impoundments.

According to statistics, the above measure groundwater storage and permeability to store and back up every year more than preliminary estimates that some 100 million cubic metres.

Road green belt between drop height "pool"

Since 2006, Beijing increased public rainwater utilization in urban green space in facility construction, in the Olympic forest park, the garden, the summer palace, Beijing Botanical Garden and many parks are rainwater collection systems have been built, including garden can be done two years of rainwater collected all.

Without a rainwater collection and other facilities within the parks, green spaces, advocated the use of rainwater utilization in pits, ditches, and other convenient facilities, using porous paving roads, increase allows rainwater infiltration within the Greenbelt area and maximize absorptive Greenland its own rain.

Garden Department also requested that the green belt, on both sides of a street tree in the middle of the road, motor and non-motor vehicle lane separator green surface elevation curb stone 8-10 cm, green belt forming a "pool", so that rainwater can remain within the Greenbelt, does not enter the road drains.

Controversy

Whether it should be built "of sunken green space"?

Expert says it can form a natural "reservoir"; gardening sector against road construction

Also called low elevation greenbelt of sunken green space, using its lower than the surrounding terrain to gather rainwater.

Earlier, a city planning expert said, along with urbanization, farmland replaced by asphalt, impervious area ratio increased significantly, increased the pressure of urban flood control and drainage, road problems such as water, by the rainwater drain.

The expert suggested that Beijing should build more of sunken green space to store rainwater, encountered when it rains, can reduce the water velocity, prolong storage time, but also form a natural "reservoir".

It is understood that Beijing has in a number of sites of sunken green space.

Yesterday, the Municipal Gardens Bureau and clearly expressed its opposition, known as green space and height in urban road, near (referring to some points along the direction of a plumb line to the absolute base surface distance) relationship, not the green one to decide. Construction of sunken green space produces substantial earthworks, impractical in actual operation.

Meanwhile, initial rain on the way, salts of heavy metals, petroleum compounds and other pollution, will have a devastating impact on road greening.

Gardening Bureau said, because of low elevation Greenbelt under to receive the rain-soaked, we can't plant trees, reducing trees planted in the green space. Water-resistant shrubs soak time is usually no more than 36 hours, otherwise they will be killed. So, not just green spaces eliminate stormwater features, reduce the ecological function of plant diversity.

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Compulsory residential building rainwater-Green

Yesterday, the Beijing Municipal Bureau of landscape green rainwater harvesting advice, recommendations in conjunction with the planning, construction and other related departments for rainwater utilization forms and technical requirements, and related set conditions for study, propose solutions, and mandatory requirements, guiding the construction of courtyard rain-collection in green residential area and unit together to promote residential units and construction of rain-collecting green space within the garden.

In addition, the Gardens Bureau recommended that green space development and utilization of underground space should be tightly controlled to ensure access for rainwater permeability of green space, which is to reduce stormwater runoff and reduce the flood of important areas.

(Original title: ≈ 200 years collecting rainwater on Kunming Lake in Beijing)

02:30 on June 24, 2014 The Beijing News