Timeline / Data.gov — Environment Datasets

changed Source changed

A new raw object was archived. Both versions are preserved. 98 line(s) added, 98 line(s) removed.

Evidence

What changed derived

This diff is not evidence. It was produced by civic-memory.diff_engine 1.1.0 at 2026-10-04T12:26:06+00:00 by normalizing the two archived objects above. The objects are authoritative; this reading of them can be regenerated or deleted without loss. 98 line(s) added, 98 line(s) removed.

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  "description": "This dataset contains non-peak streamflow statistics for select USGS streamgages in and near the state of Nevada through water year 2021. Streamflow statistics were calculated in the R statistical software environment (R Core Team, 2025) and included three categories of metrics: basic flow statistics, flow duration statistics, and low-flow recurrence probability estimates. Users can reference the accompanying Scientific Investigations Report for specific details on the R packages used and the analytical methods applied. Basic streamflow statistics include maximum mean, minimum mean, and mean annual and monthly streamflow. Flow-duration statistics describe the percentage of time a specified flow was equaled or exceeded during a defined period (Searcy, 1959). These statistics include 1-, 10-, 25-, 50-, 75-, 90-, and 99-percent annual and monthly duration flows. Low-flow recurrence-probability calculations include the minimum 7-day mean flow observed for the period of record, the 7Q10 (the minimum consecutive 7-day average flow expected to occur on average once every ten years) and 1Q10 (the minimum consecutive 1-day mean flow expected to occur on average once every ten years) as described in Riggs (1972). Statistics were computed for 228 streamgages using daily mean flow (”daily value”) data from the USGS Water Data for the Nation (USGS, 2026). This data release consists of six separate comma-separated value (CSV) files containing non-peak flow statistics for the selected streamgages. A complete description of analytical methods is provided in the “Non Peak Statistics” section of the larger work.",
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