The drainage system of a village in Hangzhou has been used for thousands of years. Do you know where there is such a drainage system?

Shen 'ao Village is one of the first three-level scenic spots in Zhejiang Province. It is located in 4A-level ancient villages in the south of the Yangtze River, including Xu Fan, Huan Fan, Diebu and Qingyuan. The ancient village of Shen 'ao in Hangzhou is famous for its water system. In the early Southern Song Dynasty, when the ancestors of the Tujia people in Shen built the village, they first built the water system and then lived here. The whole water system consists of five levels, which treat drinking water, domestic water and sewage respectively. The 800-meter-long tunnel runs through the village. Every once in a while, there is an entrance to Macao, which passes through the front and back of every household. They are independent and interrelated, fully regulate the ground and groundwater resources, separate drinking water, domestic water and sewage, and make water always in a flowing state. This reflects the environmentally friendly use of water resources, and in practice, it is a disaster caused by the flood of address flow and the flood of groundwater to villages.

Pebbles are paved at the bottom of the canal, and vaults are built in the canal, which can clear the mud and get in and out, and the canal water is sweet and pure. Parallel to this culvert is a ditch passing through the house. There are drains in every yard. According to Feng Shui in Ming and Qing Dynasties, what is it called? Four waters in one? . The rainwater stored in the yard flows into the drainage ditch in front of the house and takes away the sewage. There are karez 17 and pond 12 in the village. Such a complete water system makes Shen 'ao village as far away from floods and droughts as possible, which was very far-sighted in the village planning more than 1000 years ago. Up to now, there are still more than 100 ancient buildings in Shen' ao, with a construction area of about 40,000 square meters, which still retains the architectural style and living customs of that era.

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