Transparency tube provides reliable water-quality measurements
Erwin Van Nieuwenhuyse
Authors AffiliationsR. Dahlgren is Professor, Soils and Biogeochemistry Program, UC Davis; E. Van Nieuwenhuyse is Fisheries Biologist, U.S. Bureau of Reclamation, Sacramento; G. Litton is Professor, Department of Civil Engineering, University of the Pacific (UOP), Stockton.
Hilgardia 58(3):149-153. DOI:10.3733/ca.v058n03p149. July 2004.
We examined the efficacy of using transparency-tube measurements to estimate turbidity, total suspended solids (TSS) and particulate nitrogen and phosphorus concentrations in several California waterways. Just as lowering a black-and-white disk (Secchi disk) into a lake provides a convenient way to measure its water clarity, a transparency tube offers a practical alternative for measuring water clarity and suspended solids concentrations in California streams and waterways. While transparency relationships with turbidity and TSS are strongest within a given sampling location, these relationships are relatively robust across a wide range of water bodies displaying contrasting conditions. However, transparency-tube measurements appear to have limited value in predicting particulate nutrient concentrations, even at a given sampling site. The low cost, ease of use and excellent repeatability of measurement make the transparency tube a potentially valuable tool for anyone interested in monitoring water quality, including farmers, ranchers, citizen volunteer groups, schools and local governments seeking to get involved in watershed monitoring programs.
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