Technical Results
Post-construction Impacts on Water Quality

Construction  |  Post-construction

In general, concentrations of pollutants in the traditional subdivision either decreased or did not change after construction (Figure 1). However, in the LID subdivision, concentrations of some pollutants decreased, but others such as TSS, NO3-N, and TP, increased (Figure 1). For pollutant mass export, the large flow increases in the traditional subdivision caused large increases in all pollutants measured (Figure 2). TSS and TP mass export increased from the LID subdivision, but increases were much less than from the traditional subdivision.

Figure 1. Significant changes in pollutant concentration, after construction was completed. Units are mg/L for NO3-N, NH3-N, TKN, TP, BOD and μg/L for Cu, Pb, and Zn. Figure 2. Significant changes in mass export (kg/ha/year) after construction was completed.

 



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