Presentation at the TWCA mid year conference 2012 www.twca.org Robert E. Mace, Ph.D., P.G. Texas Water Development Board presented to the Texas Water Conservation Association Horseshoe Bay, Texas, June 15, 2012

1. Drought: It Ain’t Over
Till It’s Over…
Robert E. Mace, Ph.D., P.G.
Texas Water Development Board
presented to the Texas Water Conservation Association
Horseshoe Bay, Texas, June 15, 2012

2. or…
The Drought Ain’t Over Until
John Nielsen-Gammon Sings

7. Drought categories with time
100
90
80
70
60
50
40
30
20
10
0

8. Drought categories with time
100
90
80
70
60
50
40
30
20
10
0

9. RESERVOIR CONSERVATION STORAGE DATA
( )
-1% from last
week

10. Reservoir Storage by Climatic Region (% Full)
(Change from 5/30/2012)
(+0.03%) (+0.14%)
(-0.37%)
(-0.71%)
(-0.11%) (-0.20%)
(-0.40%)
(-1.77%)
(-1.05%)

12. “Lake” Meredith (Texas share)

13. O.H. Ivie Reservoir

14. Lake Brownwood

15. Lake Travis

16. Falcon Reservoir (Texas share)

17. Total storage in Elephant Butte ~ 2,000,000 acre-feet (total
storage in Caballo varies during the year from ~350,000
acre-feet to 50,000 acre-feet)

18. April 1-30, 2012 30-Day Precipitation
86% Percentage of Normal
60% May 1-30, 2012
45%
74%
99%
38% 60%
42%
101%
44% 55%
51% 47%
Percentage of
Normal 48%
0%-19%
20%-39% 204%
137%
40%-59%
60%-79%
80%-99% 105%
100%-119% 72%
>120%
105%
73%
http:// www.southernclimate.org/products/precip.php

19. Streamflow Index
30-day Mean Flow Conditions

20. Groundwater Level in J-17 Well
Stage 1
Stage 2
Stage 3
http://www.saws.org/our_water/aquifer/

21. Public Water Supply
Systems Affected by
Drought
June 6, 2012
Total number of Community water systems affected: 1009
Total number of active Community water systems in Texas: 4699
RESOLVED (1)
WATCH – Voluntary (417)
WATCH – Mandatory (592)
http://www.tceq.state.tx.us/permitting/water_supply/pdw/trot/location.html

23. El Nino/La Nina:
50% chance of El Nino 2nd half 2012

24. Demand v. Supply
Demand for water
Acre-feet
Water we have now

26. Robert E. Mace, Ph.D., P.G.
Texas Water Development Board
presented to the Texas Water Conservation Association
Horseshoe Bay, Texas, June 15, 2012