santa cruz ama virtual tour santa cruz ama virtual tour september 2000
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Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
Santa Cruz AMA
Virtual Tour
September 2000
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
In 1980...…the Code created the Tucson AMA
But after 14 years... …the Code
created the Santa Cruz AMA
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour IntroductionIntroduction
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour IntroductionIntroduction
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour IntroductionIntroduction
The management goal of the Santa Cruz AMA is to maintain a safe-yield condition in the active management area and to prevent local water tables from experiencing long-term declines.
§45-562(C)
Nogales
I-19
I-19 SR-82
PIMA
COUNTY
Amado SANTA
CRUZ
COUNTY
Tubac
Rio Rico
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
Land OwnershipIntroductionIntroduction
CoronadoNational
Forest
CoronadoNat’l
Forest
CoronadoNat’l
Forest
Land Ownership
StateLand
StateLand
StateLand
State Park
• SCAMA covers 716 square miles
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour IntroductionIntroduction
• 37,000 people• Nogales, Rio Rico,
Tubac and Amado• Population concentrated
in Nogales and along the Santa Cruz River
• Large fluctuations in temporary residents
Nogales
Tubac
PIMA
COUNTY
Rio Rico
SANTA
CRUZ
COUNTY
Amado
Demographics
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
United States
Mexico
‘Ambos Nogales’
Binational IssuesIntroductionIntroduction
• Nogales, AZ population approximately 23,000
• Nogales, Mexico population approximately 300,000
• Binational watershed• Well fields in Arizona
downstream from well fields in Sonora
• Impact in AZ from water policies in Mexico
• Mexico’s right to return effluent flows
• Impact of additional development in Mexico
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
18-20"
16-18" 14-16"
20-22"
18-20"
28-30"
20-22"
20-22"
24-26"
24-26"
20-22"
26-28"
20-22"
Physical SettingPhysical SettingClimate
Mean annual precipitation
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Physical SettingPhysical SettingSurface Water
Santa Cruz River
Sopori Wash
Sonoita Creek
Nogales Wash
Josephine Canyon
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
– Nogales Formation• oldest & deepest layer• low yield
– Older Alluvium• large storage• low transmissivity
– Younger Alluvium• productive & heavily used• 40 to 150 feet thick
Bedrock
Nogales Formation
Older Alluvium
Younger Alluvium
Physical SettingPhysical Setting
• Three layer aquifer system
Hydrogeology
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
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Blue: exempt Red: non-exempt
WellsPhysical SettingPhysical Setting
• ~1,300 registered wells
• Two-thirds of wells are exempt
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour DemandDemand
25,800 AF
10,300 AF
7,300 AF
1,500 AF
537 AF
8,600 AF
All water uses
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour SupplySupplyLow Range/Poor Year
Estimate (10th Percentile)
High Range/Good Year Estimate (90th Percentile)
Total supply 39,600 Total supply 142,900
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour BudgetBudgetSanta Cruz AMA Budget
0
20000
40000
60000
80000
100000
120000
140000
160000
19
85
19
86
19
87
19
88
19
89
19
90
19
91
19
92
19
93
19
94
19
95
19
96
19
97
19
98
19
99
YEAR
ACRE/FEET
0
20000
40000
60000
80000
100000
120000
140000
160000
ACRE/FEET
Municipal Demand Agriculture Demand
Industrial Demand Riparian Consumption
Underflow Leaving AMA Surface Flow Leaving AMA
10th Percentile Supply 50th Percentile Supply
90th Percentile Supply
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour BudgetBudget
• During wet years the aquifers get replenished and more water leaves the AMA
• The use of a long term water budget could be misleading due to limited storage capacity and fast movement of water in the younger alluvium
• Safe yield is assumed to be achieved in the long term
• In dry years the aquifers are overdrafted
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Historic TrendsHistoric Trends
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
• Winter mix, bermuda, & fescue
• Mostly used for cattle pasture
• 65 irrigation rights (>10 AC)
• 24 rights using >50% of allotment
AgricultureAgriculture
• One irrigation right accounts for 1/3 to 1/2 of total use
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
Ac
re-F
ee
t
1995 1996 1997 1998
Agricultural Demand58-112480.0000 compared to all other
Irrigation Grandfathered Rights
Other Rights "Rio Rico Right"
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
Ac
re-F
ee
t
1995 1996 1997 1998
Agricultural Demand58-112480.0000 compared to all other
Irrigation Grandfathered Rights
Other Rights "Rio Rico Right"
Rio Rico irrigation acres
Tubac irrigation acres
Sopori irrigation acres
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour MunicipalMunicipal
• Four large providers (~90% of muni. demand)
• 750 domestic exempt wells
• Ten Small providers
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Tubac Valley W.C.
Valle Verde W.C.
Rio Rico Utilities
City of Nogales W.C.
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
b
b
b b
• Four golf courses• One regulated sand &
gravel facility
IndustrialIndustrial
Rio Rico
Tubac
Palo Duro
Kino Springs
San Xavier Sand & Gravel
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour RiparianRiparian
• ~26,000 AF of riparian evapo-transpiration
• Nogales International Wastewater Treatment Plant (NIWWTP) is primary source of water
NIWWTP
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour ProjectionsProjections
Projected Water UseBy sector, for 'Conservation Scenario'
0
2,000
4,000
6,000
8,000
10,000
12,000
2000 2005 2010 2015 2020 2025Year
Acr
e fe
et
Agriculture
Municipal
Industrial
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Issues and ChallengesIssues and Challenges
• Conjunctive Management of Surface Water and Groundwater
- Impact on surface water rights by groundwater pumping
- Community desire to protect riparian habitat
- Physical challenge in developing recharge facilities
- Difficulty in measuring achievement of management programs
• Maintain the AMA goal in a highly variable system
• Lack of access to renewable water supplies
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Issues and ChallengesIssues and Challenges
• Implementation of Assured Water Supply Rules
• Establishment of well spacing criteria
• Work with local water users to propose legislation to create a replenishment/water district authority
• Continue dialogue with local, state and federal agencies in Mexico to negotiate agreements in future effluent uses
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour
• Increase in hydrological data collection
• Evaluation of natural water demands and supplies
• Publication of the Third Management Plan as Santa Cruz AMA
• Establishment of binational cooperation in hydrological data collection and exchange
•Support the efforts to reach a surface water claims settlement prior to adjudication
•Refined understanding of the hydrological conditions by the development of surface and groundwater models
•Funding grants to explore water augmentation opportunities
AMA AccomplishmentsAMA Accomplishments
Santa Cruz AMA Virtual Tour Santa Cruz AMA Virtual Tour Santa Cruz AMA Santa Cruz AMA
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