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The Enhanced Flow Duration Curve
  • Richard Koehler
Richard Koehler
Visual Data Analytics

Corresponding Author:[email protected]

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Abstract

Flow duration curves (FDCs) are a mainstay analysis technique examining the composition of streamflow using an exceedance probability approach. But despite the multiple versions developed over the past 100+ years, FDCs have never been able to display day-today discharge information-until now. Presented is a technique to add temporal sequence information to the fundamental FDC by incorporating a lag(1) autocorrelation scatterplot. This modification shows regions of discharge increases (dQ/dt > 0), discharge persistence (dQ/dt = 0), discharge decreases (dQ/dt < 0) and the number and degree of daily discharge changes. The result is a more informative visual representation of streamflow.