HomeMy WebLinkAboutRTI_IRD_flow_metricsRTI IR&D FLOW METRICS
Time Step Component Threshold Calculation
Extreme low flow 10th percentile
Low Flow 25th percentile
Base/Median Flow 50th percentile
High Flow 75th percentile
3‐day minimum ‐
7‐day minimum ‐
30‐day minimum ‐
90‐day minimum ‐
3‐day maximum
7‐day maximum
30‐day maximum
90‐day maximum ‐
extreme low flow threshold
10th percentile
based on all records for the full
period of record (30+ years)
extreme low flow count ‐
number of events that are lower
than the extreme low flow
threshold, summed on an annual
basis for the full period of record
(30+ years) (final value is the
median/mean of the annual
counts)
extreme low flow duration
(longest)‐
duration of the longest,
continuous event lower than the
extreme low flow threshold,
determined on an annual basis for
the full period of record (30+
years) (final value is the
median/mean of the annual
longest durations)
Based on all daily records (for a
given month) for the full period of
record (30+ years)
moving averages calculated for
each year for the full period of
record (30+ years) (final value is
the median/mean of the annual
averages)
Monthly
Annual