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An actual flood event is used as the input to the flood control system consists of the Pubugou reservoir and Leshan city. The stepwise trial-and-error algorithm (Zhong et al. 2003) is employed to solve the established optimization operation model. By setting different upper limits of water level, 10 non-dominated flood control operation alternatives are generated and their criteria values are obtained after reservoir flood routing, as shown in Table 1.

Table 1

Criteria values of the 10 reservoir flood control operation alternatives

Alternative no.Zch–Zmax (m)Ze–Zid (m)Wab (106 m3)Qmax (m3/s)T (h)Wex (106m3)ZfQfSl (t)Qsd (m3/s)
1 4.78 5.44 1970 4810 51 40 0.28 0 290 508 
2 5.28 5.10 2100 4880 56 48 0.13 0 277 561 
3 5.78 4.58 2220 4940 59 54 0.08 0 260 614 
4 6.28 4.02 2350 5020 66 61 0 0 250 667 
5 6.78 3.46 2480 5090 72 70 0 0 237 720 
6 7.28 3.06 2620 5180 76 74 0 0 224 773 
7 7.78 2.45 2750 5270 83 82 0 0 211 826 
8 8.28 2.11 2880 5350 87 90 0 0.09 198 879 
9 8.78 1.62 2940 5450 91 100 0 0.16 183 932 
10 9.28 1.20 3010 5520 96 120 0 0.32 170 985 
Alternative no.Zch–Zmax (m)Ze–Zid (m)Wab (106 m3)Qmax (m3/s)T (h)Wex (106m3)ZfQfSl (t)Qsd (m3/s)
1 4.78 5.44 1970 4810 51 40 0.28 0 290 508 
2 5.28 5.10 2100 4880 56 48 0.13 0 277 561 
3 5.78 4.58 2220 4940 59 54 0.08 0 260 614 
4 6.28 4.02 2350 5020 66 61 0 0 250 667 
5 6.78 3.46 2480 5090 72 70 0 0 237 720 
6 7.28 3.06 2620 5180 76 74 0 0 224 773 
7 7.78 2.45 2750 5270 83 82 0 0 211 826 
8 8.28 2.11 2880 5350 87 90 0 0.09 198 879 
9 8.78 1.62 2940 5450 91 100 0 0.16 183 932 
10 9.28 1.20 3010 5520 96 120 0 0.32 170 985 
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