Other flow metrics

[teizeen]

Any chance that the USGS developers of this package would be interested in adding the following metrics to this package?

1. Flow reversal - number of times per water year that the a trend change occurred in the daily time-step hydrograph (rising to falling limb or falling to rising limb, except for minor variations (<2 percent)
2. Richard-Baker Index - mean daily rate of change (absolute value) of daily time-step hydrograph for each water year
3. TQmean = fraction of time in each water year that the daily time-step hydrograph exceeds the annual mean discharge for the year
4. PK2YR: ratio of the peak flow rate with a 2-year return frequency to the mean baseflow rate during the period October 1 - April 30
5. The ability of the user to pick the threshold for low flow and high flow pulse counts/frequencies (e.g. what if I want my threshold to be 2x the mean annual long term flow rate?)

[dblodgett-usgs]

Thanks for reaching out @teizeen. We are in a maintenance mode with EflowStats at this point. We don't have funding to add to the package. Would gladly consider pull requests adding functionality though.