Research Article
Using Multiple Index Comprehensive Method to Assess Urban Rainstorm Disaster Risk in Jiangsu Province, China
Table 3
Level classification standards of risk assessment secondary indices.
| | Secondary indices | First level (lowest) | Second level (lower) | Third level (moderate) | Forth level (higher) | Fifth level (highest) |
| | Continuous rainfall days (days) | <1 | 1∼2 | 2∼4 | 4∼6 | >6 | | Heavy rain days (days) | <1 | 1∼3 | 3∼5 | 5∼7 | >7 | | Maximum rainfall in 24h (mm) | <25 | 25∼50 | 50∼100 | 100∼200 | >200 | | Monthly total rainfall (mm) | <50 | 50∼124 | 124∼236 | 236∼378 | >378 | | Precipitation anomaly percentage (%) | <4 | 4∼15 | 15∼40 | 40∼100 | >100 | | Urban average elevation (m) | >35 | 35∼20 | 20∼10 | 10∼5 | <5 | | Urban green coverage rate (%) | >50 | 50∼40 | 40∼30 | 30∼20 | <20 | | Urban drainage network density (km/km2) | >32 | 32∼24 | 24∼16 | 16∼10 | <10 | | Urban water area percentage (%) | >30 | 30∼20 | 20∼15 | 15∼10 | <10 | | Impermeable construction land (km2) | <90 | 90∼148 | 148∼245 | 245∼440 | >440 | | Density of affected population (people/km2) | <1265 | 1265∼2355 | 2355∼3375 | 3375∼4430 | >4430 | | GDP of unit area (100 million yuan/km2) | <0.8 | 0.8∼1.2 | 1.2∼3 | 3∼5 | >5 | | Disaster relief investment level (%) | >17 | 15∼17 | 13∼15 | 9∼13 | <9 | | Public emergency response capability | >90 | 90∼80 | 80∼70 | 70∼60 | <60 |
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