flow_metrics.RdContains the 10th, 25th, 50th, 75th, and 90th percentile
values for each flow metric and stream segment combination. It is a data
frame where the metrics are rows with names in the Metric field,
stream segment ID is in the COMID field and
percentiles are available as fields such as pct_10, pct_25, etc
for each percentile.
flow_metrics