Proceedings of the Federal Interagency Workshop on Turbidity and Other Sediment Surrogates, April 30-May 2, 2002, Reno Nevada

摘要: As part of the Subcommittee on Sedimentation’s “Turbidity and Other Sediment Surrogates Workshop,” April 30-May 2, 2002, a questionnaire uses turbidity was submitted to water-quality coordinators for all State some Tribal agencies. The designed address key issues related turbidity, including standards, technology, ranges observed, water bodies, seasonal variability, calibration sampling protocols, use other measures fluvial suspended sediment. All but 5 40 agencies that responded indicated having established either narrative or numeric standards under their jurisdictions. In addition several are using TSS identify sediment-impaired streams stream reaches with application developing sediment TMDLs. Water clarity identified by as parameter primary interest when measuring turbidity. Several have correlated habitat aquatic life. noticed variability in is possibly an increase plankton column not runoff. Reported vary widely, ranging from below detection limits over 10,000 NTU. large majority instruments operating bulk optical properties watersediment mixtures, turbidimeters, backscatter meters (OBS), transmissometers infer analyses grab samples provide comparative SSC data. Some flow-integrated techniques depending upon project objectives. measure formazin standard USEPA Method 180.1 analysis (U.S. Environmental Protection Agency, 1999). used Oracle, STORET, “local” database spreadsheet data storage analysis. technical needs improving relation between TSS, SSC, channel stability, biological impairment; establishing reference conditions means significant departure conditions; depthintegrated isokinetic samplers; consistent procedure less expensive probes can be rapidly deployed stable field. addition, most agreed additional longterm, stream-discharge, bedload needed, should revise 1999) include state-of-the-art instrumentation capable higher concentrations without making sample dilutions.