Assessing the spatial pattern of water use in the tucson water service area
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Assessing the Spatial Pattern of Water Use in the Tucson Water Service Area. Akitsu Kimoto and Evan Canfield: Pima County Regional Flood Control Tom Arnold: Tucson Water. Background. City of Tucson/Pima County Water Study Joint Effort for Sustainable Water Resource Planning

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Assessing the Spatial Pattern of Water Use in the Tucson Water Service Area

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Assessing the spatial pattern of water use in the tucson water service area

Assessing the Spatial Pattern of Water Use in the Tucson Water Service Area

Akitsu Kimoto and Evan Canfield:

Pima County Regional Flood Control

Tom Arnold: Tucson Water


Background

Background

  • City of Tucson/Pima County Water Study

    • Joint Effort for Sustainable Water Resource Planning

      • Core Elements: Water Supply, Demand Management, Comprehensive Integrated Planning, Respect for Environment

    • Understanding Water Use Patterns is basic to address Demand Management, so the study had three focus areas:

      • Construction Pattern Changes and Water Use at a Parcel Scale

        • Per-Household Water Use Study

        • Per-Capita Water Use Study

      • Spatial Pattern of Water Use at a Subdivision Scale

        • Subdivision Water Use Study


Outline

Outline

  • Objective: Assess Water Use at a Subdivision Scale within Tucson Water Service Area.

  • We evaluated….

    • Spatial patterns of subdivision water use

    • Spatial pattern of household size

    • Property value, area and subdivision water use

    • Variability of water use within an individual subdivision.


Data used

Data Used

  • Spatial Datasets (Pima County GIS library)

    • Parcel data

    • Subdivision data

    • Tucson Water Service Area boundary

    • Census Block 2010 data

  • Tabular Data

    • MAS 2011 (Pima County Assessor’s Office data)

    • Monthly water use data from 2009 and 2010 (Tucson Water)

  • Parsed Study Dataset

    • Removed parcels with a month of no water use

    • Used parcels with homes built before 2008 (“normal” level of water demand established)

    • Used subdivisions consisting of 100% single family residences (i.e. no multi-family residences)

    • Final dataset includes~ 70,000 residential customers in 1,200 subdivisions


Average household size number of people living in a house 2010 census

Average Household Size (Number of People living in a House – 2010 Census)

Southern and Southwestern Tucson: Larger Household Size


Average household monthly water use at subdivision scale 1 ccf 748 gals

Average Household Monthly Water Use at Subdivision Scale (1 Ccf = 748 gals)

Foothills: High Water Use

High

Low

Central and Southern Tucson: Lower Water Use


Average per capita daily water use in subdivision gpcd

Average Per-Capita Daily Water Use in Subdivision (GPCD)

Foothills: High Water Use

High

Southern and Southwestern Tucson: Lower Water Use

Lower Per-Capita Water Use in Southern/Southwestern Tucson can be related to the Larger Household/Newer, More Efficient Homes

Low


Average property value for subdivision usd

Average Property Value for Subdivision(USD)

High

Low


Property area property value and water use

Property Area, Property Value and Water Use

Water use increasing with both parcel area and property value

Best Fit with Logarithmic Line; Level off with increasing parcel area

Best Fit with Liner Line; Stronger Fit than Parcel Area


Variability of water use within a subdivision

Variability of Water Use within a Subdivision

Example: Newer Subdivision constructed since 2000

77% of Homes are within this range

Mean: 5454 sq ft

SD: 941

Similar Sized Homes


Water use within a subdivision

Water Use within a Subdivision


Findings of the study

Findings of the Study

  • Household size:

    • Large: southern and southwestern Tucson (More People live in Newer and More Efficient Homes)

  • Average per-household water use:

    • High: Foothills (often over 20 Ccf [15,000 gal/mo])

    • Low: Central, Southern and Southwestern Tucson, (often less than 7.5 Ccf [~6000 gal/mo])

  • Average per-capita water use:

    • High: Foothills (up to 300 GPCD)

    • Low: Southern and Southwestern Tucson (sometimes less than 50 GPCD)

  • Water use increases with both parcel area and property value.

  • A stronger relationship between property value and water use.

  • High variability in water use within a subdivision, even if the subdivision is similar in parcel area and house size (~30 GPCD to 130 GPCD).


Questions contacts and resources

Questions, Contacts and Resources

  • Contacts

    • Aktisu Kimoto [email protected]

    • Evan Canfield [email protected]

    • Tom Arnold [email protected]

  • City of Tucson – Pima County Water Study

    • http://tucsonpimawaterstudy.com/

    • Report to be posted in next week or two


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