Accurate estimators of streamflow statistics are critical to the design, planning, and management of water resources. Given increasing evidence of trends in low-streamflow, new approaches to estimating low-streamflow statistics are needed. Here we investigate simple approaches to select a recent subset of the low-flow record to update the commonly used statistic of 7Q10, the annual minimum 7-day streamflow exceeded in 9 out of 10 years on average. Informed by low-streamflow records at 174 US Geological Survey streamgages, Monte Carlo simulation experiments evaluate competing approaches. We find that a strategy which estimates 7Q10 using the most recent 30 years of record when a trend is detected, reduces error and bias in 7Q10 estimators compared to use of the full record. This simple rule-based approach has potential as the basis for a framework for updating frequency-based statistics in the context of possible trends.
|Title||Updating estimates of low-streamflow statistics to account for possible trends|
|Authors||Annalise G. Blum, Stacey A. Archfield, Robert M. Hirsch, Richard M Vogel, Julie E. Kiang, Robert W. Dudley|
|Publication Subtype||Journal Article|
|Series Title||Hydrologic Sciences Journal|
|Record Source||USGS Publications Warehouse|
|USGS Organization||WMA - Integrated Modeling and Prediction Division|