Why is there a heavy rain but no waterlogging? The role of ceramic permeable bricks
The reporter was informed that the main body of the city ’s largest sponge city residential district reconstruction project has been completed. During the heavy rainfall on the 16th, no waterlogging occurred in the district, and the magical drainage of sponge equipment was necessary to obtain a wide range of residents. I came to the Yijiang Anyuan Community, which is located on the Qingshan River. The whole community has remodeled as much as possible the parts that can be modified with sponge equipment. A new rainwater garden has been built. The leisure square and parking lot have been transformed. The pedestrian walkway has been permeable. Paving. Visiting in the rain water garden, I found that the ground of the garden is about half a meter lower than the inside of the community, and looks like a small pond. Various types of aquatic plants are planted on one side of the garden. According to the introduction of the battle blade, despite the heavy rain on the 16th, there was no stagnant water in the rain garden. This is because the rain either entered the ground through natural infiltration or entered the drainage area of the community through an overflow well beside the garden. The pipe network finally merged into the municipal pipe network. "Sponge cities have several principles, namely seepage, stagnation, storage, cleanliness, use, and drainage. This rainwater garden embodies the above criteria." When the rain is particularly heavy, the rainwater is stored in the rainwater garden for a short time. , And then infiltrate or flow into the overflow well, this process slows down the speed of rainwater into the municipal pipe network, and then reduces the drainage pressure of the municipal pipe network during heavy rainfall. At the same time, rainwater has become the livelihood water of aquatic plants grown in the garden. In order to verify the drainage ability of the sponge equipment after the renovation, the reporter borrowed a basin of water from the residents' house and poured it directly on the permeable bricks of the walkway in the community: I saw that the water did not flow to both sides of the walkway, but directly infiltrated the ground. After the basin was splashed, only some watermarks were left on the exterior of the trail, and the shoes did not slip on it. According to a special person's explanation, the permeable brick is made of larger particles. There is empty space in the center. Under the permeable brick , there are gravel layers, sand layers, and pre-buried seepage pipes. Rainwater can quickly infiltrate and pass through the gravel. And sand filtration, objectively also played a purification effect. The reporter also noticed that the reconstruction project of the sponge city does not have the large-scale construction situation that is common in general urban construction. Instead, it is refined construction. The person in charge of the owner committee of Yijiang Anyuan Community said that before the sponge city was renovated, when there was heavy rain, there would be standing water on the community road. On the 16th, he checked in the community and found that there was almost no standing water on the road, and the rainwater was digested on the spot. "The residents felt unimaginable and very satisfied."