Technical Results
Construction Impacts on Water Quality

Construction  |  Post-construction

In general, during the construction period, concentrations of most pollutants did not change in runoff from the traditional subdivision (Figure 1). This occurrence is likely due to the effective use of erosion and sediment controls. In contrast, concentrations of many pollutants in the LID subdivision increased, likely due to the instability of recently vegetated grass swales (Figure 1). However, on a mass export basis, only TSS and TP export increased from the LID subdivision (again due to problems with establishing the grass swales). Export of all pollutants from the traditional subdivision increased, due to the large increases in flow (Figure 2).

Figure 1. Significant changes in pollutant concentration as a result of construction. 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 as a result of construction. Units are g/ha/wk, except for Cu, Pb and Zn which are g/ha/mo.


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