The rainwater harvesting system , after simple treatment, is used for land infiltration to replenish groundwater, urban greening, flushing roads, fire fighting, car washing, flushing, washing and other domestic uses, which can reduce urban rainwater hazards and reduce urban drainage and River flooding pressure can alleviate the crisis of urban resource shortage.
As a non-traditional resource utilization technology, rainwater comprehensive utilization has many functions such as saving water resources, alleviating urban water crisis, reducing disasters caused by rainwater in cities, repairing water circulation system, and improving ecological environment. The collection and utilization of rainwater in the design of the building is to intercept, collect, store and recycle the natural rainwater in the water circulation through manual or natural terrain for daily use in buildings and communities.
A complete “sponge rainwater” rainwater harvesting system is a rainwater storage matrix consisting of a rainwater storage module, a rainwater filtration well, a waterproof layer and a geotextile. The rain module matrix is wrapped in a durable, high-strength waterproof layer. The waterproof layer is professionally constructed to ensure that the entire matrix is completely sealed and waterproof. The inlet and outlet are connected to a prefabricated pit that not only serves to maintain and inspect the well, but also connects the pump on the ground through the well. To avoid long-term, expensive matrix maintenance, rainwater filtration wells need to be installed to prevent sediment and contaminants from flowing into the underground storage matrix. The water storage matrix stores water beyond a certain limit and can be discharged through the overflow pipe to the designated rainwater discharge port.
The comprehensive utilization technology of rainwater comprehensively considers the requirements of rainwater runoff pollution control, urban flood control and improvement of ecological environment, and establishes roof rainwater harvesting system, rainwater interception and infiltration system, and ecological community rainwater utilization system. Combined with the technical and economic analysis foundation, an advanced rainwater comprehensive utilization technology from collection, interception, storage, filtration, infiltration, upgrading, reuse to control is formed. And the use of self-developed a series of stereotyped products and assembly-type complete sets of equipment, the combination of rainwater utilization and ecological organic, reflecting the harmony between man and nature.
Rainwater harvesting system pathways are mainly divided into the following three categories.
(1) Rainwater collection system for pavement and its public areas
The rainwater collected on the road surface has the following characteristics: pollution is high, pollution is large, the water surface is scattered, and the initial rainwater quality is poor.
(2) Rainwater collection system in the green area
The rainwater collected in the green area is deposited, leached and has little sedimentation through the greening surface, but this rainwater will contain more (greening) fertilizer, humus and other soluble substances (formed by plant decay), and the rainwater components are also compared. complex.
(3) Rainwater collection system brought by the roof
Roof rainwater has relatively good water quality in three kinds of rainwater, and mainly contains some solid particles (caused by dustfall). Moreover, the roof rainwater surface is concentrated and easy to collect.
The rainwater harvesting system refers to the collection and utilization of the building's roof and the rainfall runoff collected by the hardened surface such as roads and plazas. It is collected through the channels of collecting, water, water, storage, rainwater, greening, landscape water, washing. And the groundwater source provides rainwater supply to achieve the purpose of comprehensive utilization of rainwater resources and water conservation. It has a wide range of significance in mitigating urban rainwater floods and groundwater table decline, controlling stormwater runoff pollution, and improving urban ecological environment. Rainwater collection uses buildings, roads, lakes, etc. to collect rainwater for greenland irrigation, landscape water use, or to build permeable pavements and paving with permeable materials to directly increase the amount of rainwater infiltration.