Figure: 30 TAC §298.430(c)(12)

United States Geological Survey Gage 08205500, Frio River near Derby
  Winter Spring Summer Fall
Subsistence
Flow
1 cfs 1 cfs 1 cfs 1 cfs
Base Flow 17 cfs 11 cfs 7 cfs 12 cfs
Small
Seasonal
Pulse
(2 per season)
N/A Trigger:  210 cfs
Volume: 1,810 af
Duration: 14 days
N/A N/A
Large
Seasonal
Pulse
(1 per season)
Trigger: 87 cfs
Volume: 1,450 af
Duration:  20 days
Trigger: 900 cfs
Volume:7,940 af
Duration: 17 days
Trigger: 58 cfs
Volume: 510 af
Duration: 13 days
Trigger: 350 cfs
Volume: 4,340 af
Duration:  24 days
Annual Pulse
(2 per year)
Trigger:  1,670 cfs
Volume:  18,800 af
Duration:  25 days

cfs = cubic feet per second
af = acre-feet
N/A = not applicable