When characterizing water quality constituents, either from a measured dataset or modeling output, it is common to report only the peak concentration or total load. In addition to these basic statistics, there are many ways to quantify observed or computed water quality timeseries data. A broader classification (and the corresponding type of analysis involved) includes the following:
These analyses have direct parallels to water quantity analysis or design applications, for example:
This paper presents analytical methods and performance metrics to characterize long-term water quality timeseries. Case studies make use of sediment concentrations (mg/L) and loading rates (lb/s) for the following applications: USGS measurements: 32-year observation in the Atchafalaya River in Louisiana, including total suspended sediment (TSS) as well as the finer particulate size fraction (<63 microns); and SWMM5 model results: 21-year simulation at a development site in Florida, including a pre-development scenario and proposed alternatives that represent uncontrolled (piped discharge), dry, and wet retention pond.
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