Improving City Water Quality through Pollution Reduction with Urban Floodgate Infrastructure and Design Solutions: A Case Study in Wuxi, China.

Solution No.1 (0.7 m) When the floodgate height was adjusted to 0.7 m, the COD Mn and NH 3 -N concentrations at all seven monitoring points showed a decreasing trend compared to the current situation of the floodgate regulation ( Figure 5 a,d).

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Unlike the change in the average COD Mn concentration, the average NH 3 -N concentration showed an increasing trend at the C5 monitoring point, increasing by 0.06 mg·L −1 , and the rate of increase was 4.29%.

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