utilities integrated master plan - arizona
TRANSCRIPT
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Utilities Integrated Master PlanUtilities Integrated Master Plan
Past Past –– Present Present -- FutureFuture
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Bradley M. Hill, R.G.Water Resources Manager
May 25, 2011
Utilities Integrated Master PlanUtilities Integrated Master Plan
�� Purpose:Purpose: guidance for water resource & infrastructure guidance for water resource & infrastructure planning planning (developments, performance criteria, etc)(developments, performance criteria, etc)
�� CityCity--wide integration:wide integration: voter approved Regional Planvoter approved Regional Plan
�� Divided into 5 Chapters:Divided into 5 Chapters:
–– Water resource, management, future projected needsWater resource, management, future projected needs
–– Water Infrastructure Water Infrastructure (pipeline & treatment sizing, locations, etc)(pipeline & treatment sizing, locations, etc)
–– Wastewater InfrastructureWastewater Infrastructure
–– Reclaimed Water InfrastructureReclaimed Water Infrastructure
–– Water PoliciesWater Policies22
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Water Water Resource Resource ChapterChapter
Water ManagementHistorical Water ProjectsRegulatory Framework
Water Use & Existing SuppliesPhysical & Legal
Population Projections and Future Water needs
Historical Growth & Slow Growth
Land Uses based on voterapproved 2001 Regional Plan
Future Water Supply OptionsVolume (AF) and Cost per AF
History of Water/ Wastewater History of Water/ Wastewater SystemsSystems
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Since 1890s, City has constructed 3 major water importation projects (Santa Fe RR / Az Lumber & Timber Co)
Sewer: new imported water & new flush toilets – sewer problems, new to frontier western towns. 1917
2010 City imported 82% potable water supplies
~33 miles of pipeline
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Historic Water Augmentation Historic Water Augmentation ProjectsProjects
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1919 – Most Remarkable Domestic Water & Power Project1st proposed rainwater harvesting on Peaks (12,275 AF/yr)
1921 – Switzer Canyon and Fort Valley DamsLos Angeles engineers & geologist / John Carollo Engineers (1932)
1969 – Central Arizona Project City submitted expression of
interest letter (15,040 AF/yr @ $32.50/AF or $132/AF in 2010)
Lower Lake Mary - 1905
Historic Water Augmentation Historic Water Augmentation ProjectsProjects
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1972 – Harshbarger & Corollo
� Upper East Clear Creek well field (~8,000 AF @ $4,250/AF)
� Canyon Diablo well field (~8,000 AF @ $3,644/AF)
� Redwall Aquifer well field (~8,000 AF @ $1,480/AF)
Wilkins Dam site
� Effluent Reuse� Lake Mary Lining
(1,600 AF @$5,905/AF)
� Mogollon Mesa Project (18,400 AF/ 12,648/AF)
� Weather Modification (211 AF @ $1,387/AF)
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Historic Water Augmentation Historic Water Augmentation ProjectsProjects
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2006 – North Central Arizona Water Supply Study
� Lake Powell – Colorado River
� Lake Mead – Colorado River
� Little Colorado River Tributaries – Mogollon Mesa
�� Little Colorado River – High TDS (saline)
Groundwater
� Redwall – Muav Aquifer
� Red Gap Ranch – Coconino Aquifer
Regulatory FrameworkRegulatory Framework
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� Safe Drinking Water Act & Clear Water Act
� AzPDES & Aquifer Protection Permits
� Adequate Water Supply Rules
� Underground Storage & Recovery Rules
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Regulatory FrameworkRegulatory FrameworkWater RightsWater Rights
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� Prior Appropriation doctrine (first in time, first in right)
� Little Colorado River Adjudication State court to determine scope, extent & priority of federal reserved water claims (includes all City water supplies)
� Gila River Adjudication only Woody Mountain well field
� Northeastern Arizona Indian Water Rights Settlement (Navajo – Hopi) on-going since mid 1990s
Historic drinking water use Historic drinking water use –– GPCDGPCDGallons per Capita per DayGallons per Capita per Day
1010
0
20
40
60
80
100
120
140
160
180
200
1980 1985 1990 1995 2000 2005 2010
TOTAL GPCD Peaked at 186 in 1989
Decline of 39%
Low of 113 in 2010
Residential : 58 GPCD – Lowest in State
Non-Residential: 42 GPCD
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Historic water use Historic water use Utility billing data (2003 Utility billing data (2003 –– 2010)2010)
Summary Eight Year Water Consumption Averages
Single Family Housing Units 212 GPHD
Multi Family Attached Housing Units 173 GPHD
Apartment Complexes 160 GPHD
Industrial/Institutional Uses 5251 GPAD
Commercial Uses 861 GPAD
Hotel Room Use 106 GPD
Modular Neighborhood 164 GPHD
GPHD gallons per house per dayGPAD gallons per acre per dayGPD gallons per day
Flagstaff’s Flagstaff’s “Bucket” of “Bucket” of Water SuppliesWater Supplies
100-Year - sustainable volumes
+ groundwater flow computer modeling +
Locally Derived Water Supplies
Locally Derived
- Groundwater 8,800 AF/year
- Surface water 2,242 AF/year
- Reclaimed water 5,800 AF/year
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Looking to the FutureLooking to the Future
� Scenario Planning: not about predicting the FUTURE, describe multiple futures that may be plausible
� 2 Methodologies: Population Projections and Land Use based upon voter approved Regional Plan
Purpose: estimate “Build-out” water
demands, compare to existing bucket of supplies, identifya deficit or need = propose solutions
0
5,000
10,000
15,000
20,000
25,000
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
2026
2028
2030
2032
2034
2036
2038
2040
2042
2044
2046
2048
2050
2052
2054
2056
2058
2060
2062
2064
2066
2068
2070
2072
2074
2076
2078
2080
Additional water
12,100 AF/year
Historical Growth Rate and Water UseTotal GPCD = 114
Estimated time when new growth exceeds existing sustainable supplies
POPULATION PROJECTION
METHOD Maximum Build-out
Population
180,000
Base caseScenario 1
Groundwater 8,800 AF/year *includes 1,150 AF/year recovered reclaimed
Surface water 2,242 AF/year *
23,100
TIME
Acre-feet
Normal Year Water Supply
* Sustainable volume estimated from USBR, 2006
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0
5,000
10,000
15,000
20,000
25,000
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
2026
2028
2030
2032
2034
2036
2038
2040
2042
2044
2046
2048
2050
2052
2054
2056
2058
2060
2062
2064
2066
2068
2070
2072
2074
2076
2078
2080
Historical Growth Rate and 20% new Water ConservationTotal GPCD = 91
Estimated time when new growth exceeds existing sustainable supplies
POPULATION PROJECTION
METHOD Maximum Build-out
Population
180,000
Base caseScenario 2
Groundwater 8,800 AF/year *includes 1,150 AF/year recovered reclaimed
Surface water 2,242 AF/year *
23,100
TIME
Acre-feet
Normal Year Water Supply
Additional Water7,800 AF/year
* Sustainable volume estimated from USBR, 2006
0
5,000
10,000
15,000
20,000
25,000
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
2026
2028
2030
2032
2034
2036
2038
2040
2042
2044
2046
2048
2050
2052
2054
2056
2058
2060
2062
2064
2066
2068
2070
2072
2074
2076
2078
2080
Surface Water Impacted due to Prolonged Drought
Estimated time when new growth exceeds existing sustainable supplies
POPULATION PROJECTION
METHOD Maximum Build-out
Population
180,000
Base caseScenario 2
Groundwater 8,800 AF/year *includes 1,150 AF/year recovered reclaimed
23,100
TIME
Acre-feet
Dry Year – Climate ChangeWater Supply
Additional Water9,900 AF/year
surface water reduced
* Sustainable volume estimated from USBR, 2006
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Land Use MethodLand Use MethodUndeveloped Land remaining * Historic water use per land useUndeveloped Land remaining * Historic water use per land use
Undeveloped
Land
Residential/Commercial7,686 acres
Build-out Water Needs:
16,500 AF/year
0
100
200
300
400
500
600
700
800
900
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
AC
RE
FE
ET
YEAR
POTABLE
RECLAIMED
Enrollment
13,443
Enrollment
14,766
Enrollment
17,529
Northern Arizona University
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Scenario Planning ResultsScenario Planning Results8 alternate futures: 8 alternate futures: 1 common theme1 common theme
Land Use MethodRegional Plan
16,500 AF/year(build-out)
9,450 AF/year
Scenario 1 – base case
Scenario 2 – modified Ind.
14,300 AF/year
9,900 AF/year (build-out)
7,800 AF/year (100 years)
4,700 AF/year (100 years)
[new commercial low water use]
[ “no new conservation]
Additional Water Needs
Scenario 1
[ “base case” no new conservation - drought]
Scenario 2
[ 20% new conservation - drought]
Population Method
Scenario 3
Scenario 4
Historic Growth Rate
Slow Growth Rate [ no new conservation - drought]
[ 20% new conservation - drought]
Today
Historic Water Use Scenario 3 – modified ASLD 14,030 AF/year
Future Water Needs TargetDemand Mgt and/or Supply Augmentation
12,000 AF/ Year
Future Water Supply Options?Future Water Supply Options?
2020
Locally Derived� Additional Water Conservation [< 20% Total < 91 GPCD
& Residential < 48 GPCD]
� New groundwater wells
� Increase reclaimed water use [recharge/recovery and direct use]
Imported� Red Gap Ranch groundwater
� Colorado River water
� Western Navajo Pipeline
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Locally DerivedLocally DerivedWater Conservation Water Conservation –– Rainwater HarvestingRainwater Harvesting
2121
New Buildings – Cisterns & Rain Barrels
� Regional Plan undeveloped lands Total Roof Top (685 ac)and # of new single family homes (17,100)
� 30-year historical precipitation from Pulliam Airport (22.5 in/year)� Size cistern to capture 1” rainfall or 50 gallon rain barrels
Cisterns - future roof tops could capture
232 AF/year($4,963/AF)
Rain Barrels – future homes
93 AF/year($1,704/AF)
Locally DerivedLocally DerivedWater Conservation Water Conservation –– Composting ToiletsComposting Toilets
2222
New Buildings
� HET 1.3 gallon/flush composting toilet (1 per house)� Clivus Multrum toilet - $6,135 and 6 ounces / flush� Saves 1.25 gallon/flush or 5,019 gallons / year� Regional Plan - # of new single family homes (17,100)
Potential Water Savings
565 AF/year($1,352/AF)1860s
“earth closet”
2010
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Locally DerivedLocally DerivedNew Groundwater Supply WellsNew Groundwater Supply Wells
2323
Estimated New Water Well
716 AF/year (493 GPM)($830/AF)
Based upon sustainable volume of groundwater within Coconino Aquifer – no mining of water supply
(Total withdrawal = natural + artificial recharge)
Fort Tuthill well drilling
Locally DerivedLocally DerivedReclaimed Water (recharge/recovery)Reclaimed Water (recharge/recovery)
2424
Estimated New Groundwater Augmentation
4,480 AF/year($974/AF pilot test)
Increased treatment @ Rio WRF to remove Pharmaceuticals & Endocrine Disrupting Compounds
then recharge via Rio de Flag
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Imported SuppliesImported SuppliesRed Gap RanchRed Gap Ranch
2525
Estimated New Groundwater Supply
12,000 AF/year($3,857/AF)
Develop Well field, Booster pumps, Storage and Pipeline to Flagstaff
Imported SuppliesImported SuppliesWestern Navajo Pipeline and Western Navajo Pipeline and
Colorado River supplyColorado River supply
2626
New Surface Water Supply
8,000 AF/year(???/AF)
� Northeastern Arizona Indian Water Rights Settlement� non-Indians may elect to participate to upsize
and extend south from Cameron
� USBR Coconino Plateau Feasibility Study
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Future Water Supply Options Future Water Supply Options
Preliminary Estimates of the Volume of Water and their Cost Preliminary Estimates of the Volume of Water and their Cost
(over a 10(over a 10--Year Period)Year Period)
DRAFT DRAFT
Volume ofVolume of Cost ofCost of
Water Water WaterWater Upfront CostUpfront Cost
Water SourceWater Source (AF/year) (AF)(AF/year) (AF) to Customerto Customer
1.1. Existing Cost of Water (Existing Cost of Water (1st half 1st half FY11)FY11)
Groundwater Groundwater $978$978
Lake Mary WTP Surface Water Lake Mary WTP Surface Water $318$318
2.2. Water Conservation Water Conservation –– Active Rainwater HarvestingActive Rainwater Harvesting
new Residential (cisterns)new Residential (cisterns) 285285 $5,500$5,500 $3,600$3,600
new Residential (rain barrels)new Residential (rain barrels) 51 51 $1,704 $100$1,704 $100
new Commercial (cisterns) new Commercial (cisterns) 3333 $2,650$2,650 $4,720$4,720
new Institutional (cisterns)new Institutional (cisterns) 20 20 $2,546$2,546 $4,939$4,939
existing existing buildings (cisterns)buildings (cisterns) 610610 ?????? ??? ???
999 999 AF/yrAF/yr $4,9634,963
Future Water Supply Options Future Water Supply Options
Preliminary Estimates of the Volume of Water and their Cost Preliminary Estimates of the Volume of Water and their Cost
(over a 10(over a 10--Year Period)Year Period)
DRAFT DRAFT
Volume ofVolume of Cost ofCost of
Water Water WaterWater Upfront CostUpfront Cost
Water SourceWater Source (AF/year) (AF)(AF/year) (AF) to Customerto Customer
3.3. Water Conservation Water Conservation -- OtherOther
Hot Water ReHot Water Re--circulating pumpcirculating pump 191191 $1,358$1,358 $130$130
Composting ToiletsComposting Toilets 263263 $1,352$1,352 $5,885$5,885
Incinerating ToiletsIncinerating Toilets 342342 $1,290$1,290 $1,860 $1,860
High Efficiency Clothes WasherHigh Efficiency Clothes Washer 191191 $505$505 $993$993
Turf (grass) removalTurf (grass) removal 1,5001,500 $297$297 $2,300$2,300
High Efficiency Toilets (1.3 gal)High Efficiency Toilets (1.3 gal) 7373 $25$25 $173$173
retrofits 1980 to 1994retrofits 1980 to 1994
2,650 AF/Yr2,650 AF/Yr
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Future Water Supply Options Future Water Supply Options
Preliminary Estimates of the Volume of Water and their Cost Preliminary Estimates of the Volume of Water and their Cost
(over a 10(over a 10--Year Period)Year Period)
DRAFT DRAFT
Volume ofVolume of Cost Cost ofof
Water Water WaterWater
Water SourceWater Source (AF/year) (AF) (AF/year) (AF)
4.4. Imported and Other water suppliesImported and Other water supplies
Indirect Reclaimed Water ReuseIndirect Reclaimed Water Reuse 4,4804,480 $974$974
New Groundwater wellNew Groundwater well 716716 $830$830
Red Gap RanchRed Gap Ranch 12,00012,000 $3,857$3,857
Western Navajo PipelineWestern Navajo Pipeline 8,0008,000 $???$???
Colorado River supplyColorado River supply 8,0008,000 $3,000$3,000
Methodology to Calculate & Compare the Methodology to Calculate & Compare the Cost Cost of of Each Each NNew Water Supply ew Water Supply
3030
Utility Rebate – Reduced electrical costs to Utility (10-yr)
Volume of water City avoids delivering (10-yr)
$100 - $91.46
0.34 AF
For example: HET Toilet with a $100 rebate
= $25/AF
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What Next?What Next?
3131
� Completed Internal City review & comments Jan & Feb 2011
� Water Commission & Sustainability Commission Feb 17th / April 13, 2011
� Coconino Plateau Water Advisory Council March 25, 2011
� F 3 Board of Directors April 21, 2011
� N. Arizona Homebuilders Association May 11, 2011
� Chamber Economic Development Committee May 25, 2011
� Other Selected Community Stakeholder Groups
� City Council
www.flagstaff.az.gov \Departments \ Utilities \ Projects 2011
Obtain a copy of the full report or executive summary