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Table 2 shows the changes in flood volume and the peak flow of the flood control pattern with polders and without polders for flood events. The comparison of discharge processes for two kinds of flood control model of each flood event is shown in Figure 4. According to the results, for different-sized floods, the urban agglomeration polders type of flood control pattern increased the flood volume and peak flow discharge compared to that of the pattern without polders, with 10% average increase in flood volume and 17% average increase in peak flow.
Table 2

Simulated results of flood control pattern with urban agglomeration polders and without polders for flood events

Flood no.Flood volume (mm)
Relative flood volume error (%)Peak flow (m3/s)
Relative peak flow error (%)
With polderWithout polderWith polderWithout polder
19890803 161 137 17.22 1,040 818 27.24 
19870701 340 313 8.51 1,000 855 16.93 
19910630 532 503 5.70 1,524 1,393 9.47 
Mean value   10.48   17.88 
Flood no.Flood volume (mm)
Relative flood volume error (%)Peak flow (m3/s)
Relative peak flow error (%)
With polderWithout polderWith polderWithout polder
19890803 161 137 17.22 1,040 818 27.24 
19870701 340 313 8.51 1,000 855 16.93 
19910630 532 503 5.70 1,524 1,393 9.47 
Mean value   10.48   17.88 
Figure 4

Comparison of stream flows of flood control pattern with the urban agglomeration polders and without polders for flood events.

Figure 4

Comparison of stream flows of flood control pattern with the urban agglomeration polders and without polders for flood events.

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