Cochise County

1
Cochise County Board of Supervisors Public
HearingDecember 5, 2006 Docket
Z-06-15 Rezoning 20 Acres from RU-4 to TR-36
Randy Brown, Applicant
2
Outline

• Provide a project overview
• Review water conservation off-set measures
• Babocomari Update
• Review rezoning conditions recommended by County
  staff
• Conclusion / Summary

3
Project Overview

• 20 acres with 20 homes
• Site-built homes only
• Minimum of 1,700 sf livable
• Conforms to Babocomari Plan
• policies growth designations
• Water Conservation Measures
• Detention basins
• Landscaping w/ drought-tolerant/low-water use
  plants
• Turf limitations
• Hot-water recirculating
• systems low-flow fixtures
• Building envelope
• _at_ 15k sf (41.7)
• Evaporative cooling only not allowed

4
Project Water Budget

• Achieves Babo Plan goal for water
• conservation measures off-set
• Consistent with Water
• Conservation measures proposed
• for Sierra Vista Sub-watershed
• Overlay District
• Water Conservation or
• Recharge Measures 3.49 af/yr
• Would result in 1.70 acre-feet less
• aquifer loss than if land was
• developed at RU-4

5
Babocomari Rezonings Overview

• Approved GB Rezoning (262 Acres)
• Approved SR-43/TR-36/RU-2 Rezoning (1,693
  Acres, 1,383 Homes)
• Proposed TR-36 Rezoning (20 Acres, 20 Homes)
• Babocomari Lands Not Rezoned

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Babocomari Rezonings Water Budget

• Water Conservation or
• Recharge Measures
• 217 af/yr
• Water Budget Offset
• 161 af/yr (compared to
• development _at_ RU-4)

7
County Staff Conditions

• Landowners must secure an approved subdivision
  in substantial conformance
• with rezoning application
• Landowners must conduct Traffic Impact Analysis
  (TIA)
• Landowners must have development agreement in
  place specifying funding,
• timing and responsibility for implementing
  TIA-dictated improvements
• Landowners must provide a comprehensive
  hydrology report to address
• drainage issues on subject and adjacent
  lands
• Landowners shall adequately demonstrate that
  projected water consumption
• will not exceed threshold
• Landowners shall ensure that approved language
  is used to alert homeowners
• of military activities in the area

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Summary

• Recommend approval
• County conditions can be met
• Water Budget Compliance achieved without
  dependency on rate
• structure
• Requires compliance with Babocomari Plan before
  subdivision plat
• approval
• Rezoning allows opportunity for better
• Roads
• Water service and water conservation
• Utilities
• Tax base and quality of life

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Questions?
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BACK-UP
Water Conservation Offset Measures Supporting
Data Enabling Development at Increased
Densities Under the Babocomari Area Plan and
Sierra Vista Subwatershed Plan
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BACK-UP
Water Conservation/Off-set Measures

• Septic System Incidental Recharge
• (Data conclusions controversial due to
  ADWR/ADEQ conflicts)
• Mesquite Tree Removal
• Distribution of Water-Wise Info
• (Lack of study data makes conclusions
  fallible)
• Building Envelopes limited to 15,000 sf/lot
• Turf limitations/Low-water use plants
• (Preliminary data indicates exterior water
  savings of 42 however, insufficient data exists
  to offer any
• supportable offset data)
• Low-flow Water Fixtures (Applicable to current
  zoning proposed rezoning)
• Hot Water Recirculating Systems (Applicable to
  proposed rezoning)
• Air Conditioning in lieu of Evaporative Coolers
  (Applicable to proposed rezoning)
• Storm water Detention Basins (Applicable to
  proposed rezoning)

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BACK-UP
Water Conservation/Off-set Measures Low-Flow
Water Fixtures

• Data from Western Resources
• Advocate study Smart Water A
• Comparative Study of Urban Water
• Use Across the Southwest ,
• December 2003
• Study shows 40.5 GPDPH water
• savings by using low-flow fixtures
• (16.2 GPCD x 2.5 persons/home)
• conservative number used is 50,
• or 20 GPDPH
• If project built _at_ current zoning
• 5 homes x 20 100 GPDPH
• With approved rezoning
• 20 homes x 20 400 GPDPH
• Net Offset

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BACK-UP
Water Conservation/Off-set Measures Hot Water
Recirculating Systems

• Data from Oak Ridge National
• Laboratory Study Water Energy
• Savings using Demand Hot Water
• Recirculating Systems in Residential
• Homes, October 2002
• Study shows 25 GPDPH water
• savings by using hot water recirculating
• systems
• With approved rezoning
• 20 homes x 25 500 GPDPH
• Net Offset 500 GPDPH

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BACK-UP
Water Conservation/Off-set Measures AC in lieu of
Evaporative Coolers

• Data from University of Arizona
• Cooperative Extension Study
• Evaporative Cooler Water Use, May 1994
• Study shows evaporative cooler water
• consumption range between 96 GPDPH to
• 16 GPDPH
• Babocomari property owners shall use Air
• Conditioning Systems in lieu of
• Evaporative Coolers for cooling home
• Conservative number of 16 GPDPH water
• off-set by using Air Conditioning Systems
• With approved rezoning
• 20 homes x 16 320 GPDPH
• Net Offset 320 GPDPH

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BACK-UP
Water Conservation/Off-set Measures Storm Water
Detention Basins

• Data from Southwest Hydrology article
  Predicting Groundwater Recharge Rates in
  Urbanized Watersheds, July/August 2004
• Article shows that pre-development
• recharge rates ranged from 0.005 - 0.015 of
• annual precipitation for unimproved wash
• Conservative number of .025 recharge rate
• used to approximate increased recharge
• capability of improved detention basin
• over unimproved wash
• Annual precipitation 16.1 inches/year, or
• 1.342 feet x 44 acres 59.05 acre-feet x
• 325,851 gal/af 19,241,501 gal/year 365
• days 52,716 x .025 recharge
• Net Offset 599 GPD

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BACK-UP
Water Conservation/Off-set Measures Northern
Sunrise Water Rates

• Data from various studies in Colorado,
• New Mexico and California have shown a
• positive correlation between increasing
• block rate price structures and decreased
• water consumption
• Whetstone Water Improvement District
• (WWID) off-set based on higher rates as
• basis for decreased consumption of 70 GPDPH
• Northern Sunrise Water Company rates
• will be 9 - 22 higher than WWID
• If project built _at_ current zoning
• 11 homes x 70 770 GPD
• With approved rezoning
• 44 homes x 70 3080 GPD

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BACK-UP
Water Company Update
NSWC Application for CCN APPROVED June 29, 2006,
Document Control No. 0000056636
Rates Approved in NSWC Application for
CCN APPROVED June 29, 2006, Document Control No.
0000056636
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BACK-UP
Water Company Rate Comparisons
82 GPCD (Note 2)
174 GPCD (Note 3)
122 GPCD (Note 3)

• Notes
• All consumption rates per 1,000 gallons used per
  month.
• Per WWID letter dated 9/29/05.
• Per ADWR Upper San Pedro AMA Review Report,
  Appendix K-1, Mar 2005
• NSWC rates increase 42 for usage over 10,001
  gallons per month

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BACK-UP
Representative Monthly Water Bill Comparisons

• Italicized figures in parenthesis (6.25)
  indicate cost per 1,000 gallons
• Strong correlation between higher rates and
  lower consumption
• Northern Sunrise rates 9 - 22 higher than
  Whetstone Water Improvement District
• Data supports continued use of off-sets for
  Babocomari Area Plan developments

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BACK-UP
Project Overview Combined Water Budget