Figure: 30 TAC §298.330(e)(11)

United States Geological Survey Gage 08158700, Onion Creek near Driftwood
Season Hydrologic
Condition		 Subsistence Base Small
Seasonal
Pulse
(2 per season)		 Large
Seasonal
Pulse
(1 per season)		 Annual
Pulse
Winter Severe 1 cfs 2 cfs N/A Trigger:
170 cfs
Volume:
1,900 af
Duration:
20 days		 Trigger:
1,200 cfs
Volume:
8,700 af
Duration:
34 days
Winter Dry N/A 2 cfs
Winter Average N/A 6 cfs
Winter Wet N/A 26 cfs
Spring Severe 1 cfs 4 cfs Trigger:
200 cfs
Volume:
1,100 af
Duration:
11 days		 Trigger:
620 cfs
Volume:
3,700 af
Duration:
19 days
Spring Dry N/A 4 cfs
Spring Average N/A 12 cfs
Spring Wet N/A 34 cfs
Summer Severe 1 cfs 1 cfs N/A N/A
Summer Dry N/A 1 cfs
Summer Average N/A 3 cfs
Summer Wet N/A 7 cfs
Fall Severe 1 cfs 1 cfs Trigger:
18 cfs
Volume:
70 af
Duration:
5 days		 Trigger:
120 cfs
Volume:
560 af
Duration:
11 days
Fall Dry N/A 1 cfs
Fall Average N/A 3 cfs
Fall Wet N/A 7 cfs

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