SOUTHERN NEVADA WATER AUTHORITY* WATER RESOURCE UPDATE JOHN ENTSMINGER GENERAL MANAGER
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SOUTHERN NEVADA WATER AUTHORITY* WATER RESOURCE UPDATE JOHN ENTSMINGER GENERAL MANAGER
WATER RESOURCES
Southern Nevada is nearly fully
reliant on the Colorado River to
meet the community's water
demands.
90%
■ Colorado River Other
2
RETURN FLOWS
Southern Nevada recycles
99% of water used indoors,
thereby extending the
availability of its resources.
3
DROUGHT
In the early 2000s, the Colorado River began
to experience significantly decreased inflows.
4
DROUGHT
Drought conditions have significantly depleted Lake Mead's storage
1999 2004 2022
95%
34%
5
LAKE MEAD ELEVATION PROBABILITIES
Surface Water Elevation (feet) Lake Mead's elevations are likely to fall below 1,050 feet as early as 2023.
Max Probable Inflow
Most Probable Inflow
Min Probable Inflow
6
SHORTAGE
In a First, U.S. Declares Shortage on
Colorado River, Forcing Water Cuts
The federal government
declared a shortage on the
Colorado River for 2022.
*__ J
Lake Mead, top left, and Boulder City, Nev., in July. The last time the lake was anywhere near full was
two decades ago. Patrick T. Fallon/Agence France-Presse — Getty Images
LAKE MEAD SHORTAGE LEVELS
Lake Mead Elevation Shortage Reduction Available
1,090+ feet 0 300,000 AFY
1,075 -1,090 feet -8,000 AF 292,000 AFY
1,050 -1,075 feet -21,000 AF 279,000 AFY
1,045 -1,050 feet -25,000 AF 275,000 AFY
1,025 -1,045 feet -27,000 AF 273,000 AFY
< 1,025 feet -30,000 AF 270,000 AFY
8
WATER RESOURCE PLANNING
New account growth and longer-term forecasts
are much higher than previous years.
New Account Growth (LVVWD)
WATER RESOURCE PLANNING
The hydrology scenarios contemplated within SNWA's 2020 Water Resource Plan are
the lowest ever considered in local planning efforts.
Lake M ead Elevation (feet)
Over the most recent 22-year period, there
were nine years with inflows at or below
11.0 million acre-feet.
2022 2025 2030 2035 2040 2045 2050 2055 2060 2065 2072WATER RESOURCE PLAN
Higher levels of efficiency are needed to address population growth, offset
supply impacts due to shortage, reduce upward pressure from climate
change, and maximize the availability of existing water supplies.
Conservation Goal Progress Climate Change Impacts
150
123.7
122 GPCD
125 112 GPCD
100 86
GPCD
GPCD GAP
75 Total change
required to reach
the current and
proposed goal
50 when accounting
for climate
change and
increased losses.
25
0
2020 Climate Change System Age Current Goal Proposed
GoalWATER CONSERVATION
Southern Nevada has made progress since 2002,
but considerable work remains.
Southern Nevada Per Capita Colorado River Water
POPULATION WATER USE CONSUMPTIONREDUCING CONSUMPTIVE USE
Conservation initiatives focus on reducing consumptive water use.
Landscape Efficiency Cooling Efficiency Water Loss Control
Irrigation Compliance New Development EfficiencyREDUCING CONSUMPTIVE USE
Programs/Policies Underway Future Programs/Policies
• Existing conservation programs • Reducing golf course water budgets
• Converting cool season turf
• Pool size regulations
• Enhance leak resolution (AMI)
• Park efficiency improvements (park water
• Enhance watering schedule compliance
budgets)
• Asset management investments • Implement pricing changes
• No new golf courses*
• Large water user policy*
• AB 356 / Turf conversions*
• Cooling efficiency standards (evaporative
cooling)*
• Limit new turf installations*
indicates recently-approved initiativeNONFUNCTIONAL TURF A new law passed during the 81st Legislative Session prohibits our community's water supplies from watering existing unused grass by 2027. Single family residential homes excluded. • Neighborhood entries • Streetscapes • Medians • Roundabouts • Non-residential applications (commercial buildings, office parks, etc.)
NONFUNCTIONAL TURF In January, the SNWA Board approved its definitions of functional and nonfunctional turf. Per AB356, these definitions will be included in local purveyor Service Rules.
NO NEW TURF
A recently-approved resolution will prohibit new installations
of turf outside of schools, parks and cemeteries.EVAPORATIVE COOLING MORATORIUM Behind irrigation, evaporative cooling represents the largest consumptive water use. An approved moratorium will limit cooling towers and water-cooled HVAC systems.
COOLING It is essential to employ water-efficient technologies when developing new properties or expanding existing ones. Additionally, existing wet-cooled systems can be modified to optimize water consumption.
SNWA INCENTIVES The SNWA currently will pay up to 50 percent of the product cost for replacing an existing wet-cooled system (HVAC or evaporative) with a dry-cooled unit. Incentives are also available for upgrades to control systems, drift eliminators, etc. that reduce consumptive water use.
Water Use in Gallons Per Capita Per Day (GPCD)
Prohibit New Golf Course Development -2.4
Existing Measures -3.1
Convert Cool Season Turf -0.2 CD
Reduce Golf Course Water Budgets -0.7
Implement Large Water User Policy -0.9 cn
Implement AB356 -8.0 §
Implement Pool Development Standards -0.1 §
Enhance Leak Resolution (AMI) -0.3 o
Implement Park Efficiency Improvements -0.3 o
Implement Cooling Efficiency Standards -1.7 8
Enhance Watering Compliance -5.7
Make Asset Management Investments -1.7
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I t w i l l a ls o o f f s e t s u p p ly r e d u c t io n s a s s o c ia te d w i t h s h o r t a g e a n d
Limit New Turf Installations -8.3 c
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Implement Pricing Changes -2.9
h e lp t o r e d u c e u p w a r d p r e s s u r e o n d e m a n d s a s s o c ia te d w i t h c lim a t e c h a n g e .2021 WATER RESOURCE PLAN
11.0 MAFY Inflow Scenarios
Lower Demand Upper Demand Upper Demand
(86 GPCD by 2035) (86 GPCD by 2035) (98 GPCD by 2035 and 92 GPCD by 2055)
500,000 500,000 500,000
450,000 450,000 450,000
Permanent Future Supply Permanent Future Supply
400,000 (2032) 400,000 400,000 (2032)
Other
350,000 Future Resources
350,000 350,000
Consumtive Use, AFY
300,000 300,000 < 300,000
250,000 250,000 g 250,000
E
200,000 200,000 § 200,000
150,000 Permanent Resources Permanent Resources Permanent Resources
150,000 150,000
100,000 100,000 100,000
50,000 50,000 50,000
0 0 0
2021 2025 2030 2035 2040 2045 2050 2055 2060 2065 2072 2021 2025 2030 2035 2040 2045 2050 2055 2060 2065 2072 2021 2025 2030 2035 2040 2045 2050 2055 2060 2065 2072SOUTHERN NEVADA WATER AUTHORITY'
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