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Trend Departure Index Results for the RESTORE Trend Analysis and Streamflow Alterations studies

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: January 27, 2026 | Last Modified: 2020-12-02T00:00:00Z
Trend Departure Index (TDI) is computed as: (number of quantiles for which the trend result departs from the result for the associated reference site) / (total number of quantiles). In a Quantile-Kendall analysis for the annual time frame, the denominator, or total number of quantiles, is 365. TDI varies from 0 to 1; a TDI of 0 indicates the trend results for the site are identical to the reference site and any value larger than 0 indicates some departure compared to the reference condition. The larger the number (the closer to 1) the more departure or deviation relative to the reference site in trend across all the quantiles for the site.

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