Flood Risk Zoning by Using 2D Hydrodynamic Modeling: A Case Study in Jinan City

Table 4

Characteristics and areas for different risk levels of historical and designed rainfall events, respectively.

Designed rainfall & historical rainfall	Total rainfall (mm)	Maximum hourly rainfall intensity (mm⋅h^−1)	Flood risk area (hm^2)
			Low	Moderate	Significant	Extreme
P = 1	26.7	–	98.9	0.3	0.7	0.2
P = 5	38.84	–	97.6	0.5	1.6	0.5
P = 10	44.06	–	96.8	0.6	2.2	0.5
P = 20	49.29	–	95.9	0.6	3.1	0.6
2013-07-23	71.3	22.9	99.0	0.3	0.7	0.2
2015-08-03	62.1	39.6	97.5	0.5	1.7	0.4