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    Author(s): Robert B. Thomas
    Date: 1989
    Source: Gen. Tech. Rep. PSW-114. Berkeley, Calif.: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 11 p
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (470 KB)


    A probability sampling method called SALT (Selection At List Time) has been developed for collecting and summarizing data on delivery of suspended sediment in rivers. It is based on sampling and estimating yield using a suspended-sediment rating curve for high discharges and simple random sampling for low flows. The method gives unbiased estimates of total yield and variance. The technique has been modified by replacing the rating curve with a user-specified average sampling rate function. This function allows easier specification of field sampling parameters for specified conditions and helps avoid the extremes of data collection. It also improves the distribution of samples if the intent is to estimate suspended sediment yield during storms specified after data collection. This form of SALT sampling is called Piecewise SALT sampling.

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    Thomas, Robert B. 1989. Piecewise SALT sampling for estimating suspended sediment yields. Gen. Tech. Rep. PSW-GTR-114. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 11 p.


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    suspended sediment, sampling, probability sampling, measurement, SALT sampling

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