Verification of a depth-integrated sample arm as a means to reduce solids stratification bias in urban stormwater sampling

Journal of Environmental Monitoring : JEM
William R SelbigRoger T Bannerman

Abstract

A new water sample collection system was developed to improve representation of solids entrained in urban stormwater by integrating water-quality samples from the entire water column, rather than a single, fixed point. The depth-integrated sample arm (DISA) was better able to characterize suspended-sediment concentration and particle size distribution compared to fixed-point methods when tested in a controlled laboratory environment. Median suspended-sediment concentrations overestimated the actual concentration by 49 and 7% when sampling the water column at 3- and 4-points spaced vertically throughout the water column, respectively. Comparatively, sampling only at the bottom of the pipe, the fixed-point overestimated the actual concentration by 96%. The fixed-point sampler also showed a coarser particle size distribution compared to the DISA which was better able to reproduce the average distribution of particles in the water column over a range of hydraulic conditions. These results emphasize the need for a water sample collection system that integrates the entire water column, rather than a single, fixed point to properly characterize the concentration and distribution of particles entrained in stormwater pipe flow.

References

May 11, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·William R Selbig, Roger T Bannerman
Sep 6, 2011·Journal of Environmental Monitoring : JEM·Melissa GettelAndrew J Erickson

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Citations

Jan 3, 2013·The Science of the Total Environment·William R SelbigSteven R Corsi
Jul 30, 2016·The Science of the Total Environment·William R Selbig
Jul 1, 2014·Environmental Science. Processes & Impacts·Kerstin NordqvistMaria Viklander
Oct 27, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·D MorganL Gill

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