Characterization of bridge deck runoff.
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2015-03-01
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Abstract:In this study, time-weighted composite samples of bridge runoff and hourly traffic data were collected at four sampling
locations in Nebraska. Total suspended solids (TSS) and hexane extractable material (HEM) had the highest concentrations
during the first rainfall event of the year, while other constituent concentrations peaked during the third rainfall event of the
year. In general, constituent concentrations were highest in the spring, and then decreased throughout the summer and fall.
Average concentrations of TDS, TSS, chloride, iron, and lead measured in this study were higher than those found in the
previous NDOR study at the same sampling locations. For lead and iron, it was difficult to observe a direct relationship
between concentration and ADP, or concentration and daily traffic. However, there was a stronger correlation (R2 =
0.3716) between traffic during ADP and the concentration of zinc. This difference may be explained in the sources of these
metals in runoff. The only source of zinc in bridge deck runoff is vehicle wear, but the sources of iron include the materials
and structure of the bridge in addition to vehicle materials. Therefore, to improve the correlation for iron and lead, it is
necessary to consider other variables such as bridge design and bridge materials, or other non-bridge related sources.
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