Rainwater garden of sponge city

Abstract

The invention discloses a rainwater garden of a sponge city. The rainwater garden comprises a backwater layer, a covering layer, a planting soil layer, a transition layer, a gravel layer, an anti-seepage geomembrane and a plain soil layer, wherein a plurality of perforated pipes are horizontally lay in the gravel layer; two ends of each perforated pipe are connected with a vertical vent pipe; a drain pipe is also horizontally lay in the gravel layer and connected with all perforated pipes; a plurality of seep holes are uniformly distributed in a pipeline of each perforated pipe, the distances between the adjacent seep holes in the length direction of each perforated pipe are 100-200mm, the slope ratio of the upper surface of the covering layer is 1:5 and the concave depth is 150-250mm; the slope ratio of the connected part of a surrounding greenbelt and the rainwater garden is 1:6. The rainwater garden is reasonable in structural design, and high in water absorbing capacity and infiltration capacity; layered purification of discharged water can be achieved, so that the condition that the water discharged from the drain pipe can be directly used for spraying roads and greenbelts is ensured; the plurality of perforated pipes and the vent pipe are arranged, so that the water permeability and the drainage rate of the water are promoted and the relatively serious accumulated water phenomenon in the rainwater garden is avoided.

Description

technical field [0001] The invention belongs to the technical field of urban construction, in particular to a sponge city rainwater garden. Background technique [0002] Sponge city refers to a city that can be like a sponge and has good "elasticity" in adapting to environmental changes and responding to natural disasters. use. Sponge city construction should follow the principles of ecological priority, combine natural approaches with artificial measures, and ensure the safety of urban drainage and waterlogging, maximize the accumulation, infiltration and purification of rainwater in urban areas, and promote the utilization of rainwater resources and ecological environment protection. In the process of sponge city construction, the systematic nature of natural precipitation, surface water and groundwater should be coordinated, water supply, drainage and other water recycling links should be coordinated, and its complexity and long-term nature should be considered. [000...

AI Technical Summary

Problems solved by technology

However, the water seepage capacity of existing rain gardens is limited. In case of heavy rain or severe flood, the rainwater will not have time to penetrate into the ground and overflow to the hardened road surface, forming ground runoff and flowing into the sewage ditch, which not only wastes water resources, but also increases sewage. The workload of the factory to treat sewage; and the purification capacity is limited, and the water discharged from the rain garden cannot meet the domestic miscellaneous water standard

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