Figure: 30 TAC §298.330(e)(10)

United States Geological Survey Gage 08153500, Pedernales River near Johnson City
Season Hydrologic
Conditin
Subsistence Base Small
Seasonal
Pulse
(2 per season)
Large
Seasonal
Pulse
(1 per season)
Annual
Pulse
Winter Severe 7 cfs 23 cfs Trigger:
270 cfs
Volume:
1,300 af
Duration:
9 days
Trigger:
860 cfs
Volume:
4,700 af
Duration:
15 days
Trigger:
6,980 cfs
Volume:
28,320 af
Duration:
15 days
Winter Dry N/A 23 cfs
Winter Average N/A 45 cfs
Winter Wet N/A 80 cfs
Spring Severe 4 cfs 29 cfs Trigger:
1,700 cfs
Volume:
6,300 af
Duration:
8 days
Trigger:
3,700 cfs
Volume:
14,400 af
Duration:
10 days
Spring Dry N/A 29 cfs
Spring Average N/A 60 cfs
Spring Wet N/A 110 cfs
Summer Severe 1 cfs 16 cfs N/A Trigger:
90 cfs
Volume:
1,100 af
Duration:
7 days
Summer Dry N/A 16 cfs
Summer Average N/A 29 cfs
Summer Wet N/A 49 cfs
Fall Severe 1 cfs 16 cfs Trigger:
160 cfs
Volume:
620 af
Duration:
6 days
Trigger:
860 cfs
Volume:
3,000 af
Duration:
8 days
Fall Dry N/A 16 cfs
Fall Average N/A 29 cfs
Fall Wet N/A 49 cfs

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