Content of Sponge City Construction | Investment cost (10,000 RMB/y) | Maintenance cost (10,000 RMB/y) | ||
Conventional model | Sponge city model | Conventional model | Sponge city model | |
Total | 21,860 | 18,426 | 876 | 831 |
1) Construction and operation maintenance in residential area | 3960 | 5576 | 96 | 144 |
a) Roof greening | 0 | 200 | 0 | 18 |
b) Pavement (hard/ permeable) | 1440 | 2160 | 15 | 30 |
c) Green space (traditional/ecological) | 2160 | 2520 | 65 | 72 |
d) Green belt (traditional/grass planting ditch) | 360 | 396 | 16 | 18 |
e) Rainwater storage device | 0 | 300 | 0 | 6 |
2) Construction and maintenance of rainwater pipe network and pump station | 6500 | 3900 | 360 | 340 |
3) Watercourse ecological construction and maintenance | 5100 | 4500 | 270 | 250 |
4) Construction and operational maintenance of wastewater pipeline and wastewater treatment plant | 4500 | 3250 | 141 | 91 |
5) Construction and operational maintenance of waterlogging prevention facility | 1800 | 1200 | 9 | 6 |