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FLOWS FOR THE FUTURE
2005 Environmental Flows Conference
Texas State University – San Marcos
November 1, 2005
Bob Brandes
Region M Water Planning Study
Rio Grande
Planning
Region
Region M Counties and River Basins
MAVERICK
COUNTY
Figure 3.2 - Rio Grande Water Planning Region
Showing Basin Areas
Nueces
Basin
WEBB
COUNTY
Nueces
Nueces-Rio Grande
ZAPATA
Rio Grande COUNTY
JIM HOGG
COUNTY
Nueces-Rio Grande
Basin
N
Rio Grande STARR
Basin COUNTY WILLACY
COUNTY
HIDALGO
COUNTY
CAMERON
10 0 10 Miles COUNTY
Region M Projected Population
4,000,000
3,500,000
Population
3,000,000
2,500,000
2,000,000
1,500,000
1,000,000
500,000
0
D2000 D2020 D2040 D2060
De cade
Region M
Environmental Flow Issues
• Rio Grande Flows Are Highly Regulated
and Subject to Mexico’s Operations
• Rio Grande Basin Is Already Over-
Appropriated
• Projected Demands Are Changing and
Substantial Relative To Existing Supplies
• Strategies Reflect Primarily Utilization of
Existing Surface Water Resources; No
Major Surface Water Development
Major
Rio Grande Caballo
Mainstem Reservoir
Reservoirs
Amistad
Elephant Butte Reservoir
Reservoir
Falcon
Reservoir
Total Storage Capacity: Anzalduas
~ 8,000,000 Acre-Feet Reservoir
B
el
ow
El ANNUAL AVERAGE FLOW
ep
ha MILLION ACRE-FEET
nt
B ut
te
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Be D
lo am
w
A El
P
m as
er
ic o
an
A F D
bo ort am
ve Q
ui
Be Rio tma
lo C n
w on
R ch
io os
C
on
Be Fos ch
lo te os
w rR
A
m an
is ch
ta
d
D
am
D
e
Ea l Ri
gl o
e
Pa
B ss
el
ow La
Fa red
lc o
R on
Be io D
lo G am
w ra
A nd
nz e
al C
du ity
as
D
S am
an
B
en
B ito
ro
wn
sv
ille
1968-1998 Rio Grande Mean Annual Flows
Total Storage Capacity:
~ 4,000,000 Acre-Feet
Mexican
Treaty Rio San Juan
Reservoir Capacity:
Tributary ~ 1,700,000 Acre-feet
Reservoirs
Region M
Environmental Flow Issues
• Rio Grande Flows Are Highly Regulated
and Subject to Mexico’s Operations
• Rio Grande Basin Is Already Over-
Appropriated
• Projected Demands Are Changing and
Substantial Relative To Existing Supplies
• Strategies Reflect Primarily Utilization of
Existing Surface Water Resources; No
Major Surface Water Development
Region M Existing Water Rights
2,000,000 1,853,179
1,800,000
Diversion Amount
1,600,000
1,400,000
(Ac-Ft/Year)
1,200,000
1,000,000
800,000
600,000
400,000
336,642
200,000 54,819 2,694
0
MUNICIPAL INDUSTRIAL IRRIGATION MINING
Total Authorized Water Rights: 2,247,334 Ac-Ft/Yr
Projected Firm Annual Yield
Amistad-Falcon Reservoir System
Year United States Mexico Total
2000 1,087,449 901,700 1,989,149
2010 1,067,310 888,200 1,955,510
2020 1,056,719 879,700 1,936,419
2030 1,048,965 869,200 1,918,165
2040 1,041,627 858,700 1,900,327
2050 1,034,592 846,700 1,881,292
2060 1,024,987 835,700 1,860,687
Region M
Environmental Flow Issues
• Rio Grande Basin Is Already Over-
Appropriated
• Rio Grande Flows Are Highly Regulated
and Subject to Mexico’s Operations
• Projected Demands Are Changing and
Substantial Relative To Existing Supplies
• Strategies Reflect Primarily Utilization of
Existing Surface Water Resources; No
Major Surface Water Development
Region M Water Demands
D2000 Demands IRRIGATION
82.9%
LIVESTOCK
STEAM ELECTRIC
0.4%
0.5%
MUNICIPALMINING MANUFACTURING
15.5% 0.3% 0.4%
D2060 Demands
STEAM ELECTRIC
2.0%
MUNICIPAL
37.7%
MINING IRRIGATION
0.3% 59.1%
MANUFACTURING
0.7% LIVESTOCK
0.4%
Municipal Supply vs Demand
(acre-feet/year)
Irrigation Supply vs Demand
(acre-feet/year)
Historical Irrigation Demands
Figure 3.23 Total Water Irrigation and Mining Water Use
Total Irrigation Historical Use Varies According To
From Amistad and Falcon Reservoirs
Available Amistad-Falcon Supply and Climate
1,800,000
1,600,000
1,400,000
1,200,000
Acre-Feet
1,000,000
800,000
600,000
400,000
200,000
0
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
Source: Rio Grande Watermaster
Region M
Environmental Flow Issues
• Rio Grande Basin Is Already Over-
Appropriated
• Rio Grande Flows Are Highly Regulated
and Subject to Mexico’s Operations
• Projected Demands Are Changing and
Substantial Relative To Existing Supplies
• Strategies Reflect Primarily Utilization of
Existing Surface Water Resources; No
Major Surface Water Development
Projected Water Supplies
From Recommended Strategies
Acquisition/Conversion of Water Rights 136,171
Brackish Groundwater Desalination 62,339
Gulf Coast Aquifer Development 49,204
Advanced Water Conservation 43,766
Non-Potable Water Reuse 38,532
Brownsville Weir and Reservoir 20,643
Potable Water Reuse 1,120
Seawater Desalination 889
Total Additional Supply 352,664
Strategies With Potential
Direct River Flow Impacts
• Acquisition/Conversion of Existing Water
Rights
• Urbanization of Irrigated Farmland
• Purchase of Existing Unused Water Rights
• Contract for Municipal Water from Irrigation
District
• Brownsville Weir and Reservoir
• Water Right Permit Issued By State
• Includes Environmental Flow Provisions
FLOWS FOR THE FUTURE
2005 Environmental Flows Conference
Texas State University – San Marcos
November 1, 2005
Bob Brandes
Region M Water Planning Study
