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| Single control index | Notice of the General Office of the State Council on doing a good job in the construction of urban drainage and prevention facilities. State Office issued (2013) No. 23 | “Technical Specification for Rainwater Utilization Engineering in Buildings and Residential Areas” | “Outdoor Drainage Design Plan” (GB 50014-2006) | Notice of the General Office of the Provincial Government on implementing the Notice of the General Office of the State Council on doing a good job in the construction of urban drainage and waterlogging prevention facilities Suzhou Provincial Government Office issued (2013) No. 88 | Notice on issuing “Technical Guidelines for Comprehensive Utilization of Rainwater in Nanjing City (Implementation)” Nanjing Construction and Environment Agency (Implementation) Nanjing (2014) No. 612 | Implementation opinions on promoting the construction of sponge city (submission for examination) Municipal Construction Committee |
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| Permeable area ratio | No less than 40% | Among the hardened ground in the newly built urban area, the percentage of permeable ground area should not be less than 40% | Permeable ground should be used on hard ground and squares where pedestrians and nonmotor vehicles pass | Among the hardened ground in the newly built urban area, the percentage of permeable ground area should not be less than 40% | Among the hardened ground in the newly built urban area, the percentage of permeable ground area should not be less than 40% | — | Residential area: in the hardened ground, the permeability shall not be less than 40%; Road: the permeable paving rate of the newly built sidewalk is 50%, and the rebuilding rate is 30%; Park: Pedestrian system, parking lot, and other facilities adopt permeable pavement. The permeable pavement rate of new parks should not be less than 50% |
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| Sunken green space | No less than 10% | — | The road surface in the residential section should be 50–100 mm higher than the roadside green space | The elevation of the green space should be 5–25 cm lower than the elevation of the surrounding ground to form a recessed green space | — | For all construction projects that involve the requirements of the green space rate index, 30% of the green space should be used as a recessed green space for retaining rainwater | For all construction projects that involve the requirements of the green space rate index, at least 10% of the green space should be used as recessed green space for retaining rainwater, and the green space in urban parks should not be less than 30% recessed |
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| Regulation and storage facilities | No less than 100 m3/ha | — | — | — | Urban construction should pay attention to rainwater collection and utilization, with a construction standard of 100 m3/ha | For new buildings with a planned construction land area of more than 20,000 square meters, a rainwater collection and utilization system must be built; the standard is 100 m3/10,000 m2 | The planned construction land of 20,000 square meters shall be equipped with a rainwater collection and utilization system |
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