water budget rates - boulder
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8/4/2019 Water Budget Rates - Boulder
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Pathways to Lasting Solutions
“The Longest Yard”
Water Budget Rate Structures&
The City of Boulder, Colorado January 25, 2007
© 2006 Malcolm Pirnie, Inc. All Rights Reserved
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Today’s Discussion
Rate Structures in General
Water Budget Rate Structures
Water Budgets and the CityDiscussion
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What is a Rate Structure?
Typically consists of two components
Service charge
• Fixed charge, Readiness to Serve• Recover customer billing and metering costs
Volume charge• Unit charge based on amount of water used
• Variety of volumetric rate designs available
The design and organization of billing charges by customer
class in order to recover revenue requirements
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Uniform Rate
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Decreasing Block Rates
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Seasonal Rate
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Uniform RateDecreasing Block RatesIncreasing Block Rates
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Uniform RateDecreasing Block RatesWater Budget Rates
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Water Budget Rates
Designed for resource efficiency Budget individualized for each customer’s
indoor usage and outdoor usage
Retains increasing block structure
Volumetric block thresholds dependent oncustomer’s usage patterns
Indoor allowance
Outdoor allowance
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a er u ge a eComponents
Indoor allowancePeople per household
Building square footage
Number of bedrooms/bathrooms
Outdoor allowance
Irrigable area
Lot square footage
Weather considerations, evapotranspiration
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y o ou er a erBudget Rates
Drought of 2002 - 2003 Mandatory water restrictions instituted
Goal:
Reduce water use by 25 percent, or 1.19million gallons between May 2002 and April2003
Goal met by November 2002 when 1.296
million gallons was conserved
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y o ou er a erBudget Rates
Water restriction prompted Citizen involvementMore flexibility during drought (when and how much)
Preferred to know specific quantity of water needed
More education
City began investigating alternative ratestructures in June 2003Hired consultant to review various structures
Involvement included• Citizens
• Water Resource Advisory Board
• City Council
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y o ou er a erBudget Rates
Staff, WRAB selected water budget structurefrom number of alternatives
City Council endorsed water budget rate structurein December 2004
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ou er a er u ge a eStructure
5-tiered increasing block structure (volumetric)
Rates for each block are the same for each class
Block threshold based on each customer’smonthly budget
Block threshold stated as percent of total
monthly budget
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ou er a er u ge a eStructure
Budget calculation based on customer classResidential – Indoor allowance + Outdoor allowance
Multifamily – Indoor allowance + Outdoor allowance
Nonresidential – Average Monthly Usage (AMU)
Irrigation – Outdoor allowance based on irrigable
area
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Boulder Water Budget RateStructure
Rate(per 1,00 gal)
Block Size(% of budget)
Block 1 $1.95 (3/4 x base rate) 0% - 60%
Block 2 $2.60 (the "base rate") 61% - 100%
Block 3 $5.20 (2 x Base Rate) 101% - 150%
Block 4 $7.80 (3 x Base Rate) 151% - 200%
Block 5 $13.00 (5 X Base Rate) Greater than 200%
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ou er es en a a erBudget Rates
Indoor allowanceSingle family – 7,000 gallons/month
Multifamily – 4,000 gallons/month/unit
Outdoor allowance
Irrigable area “pervious area”• Single family – 3-tiered gallons/sq ft threshold basis
– Tier 1: 0 to 5,000 sq ft @ 15 gal/sq ft
– Tier 2 : 5,001 to 14,000 sq ft @ 12 gal/sq ft
– Tier 3: >14,000 sq ft @ 10 gal/sq ft
• Multifamily – 15 gallons/sq ft
Allocated on a monthly basis using ET index
ET Index = Evapotranspiration Index
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ou er onres en a
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ou er onres en aWater Budgets
Commercial/IndustrialAverage Monthly Usage (AMU)
Irrigation Irrigable area “pervious area” – 15 gallons/sq ft
Allocated on a monthly basis using Et indexEt Index = Evapotranspiration Index
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Single Family Example
Pervious area = 6,000 sq ft Indoor Annual Budget:
7,000 gal/month * 12 months = 84,000 gallons
Outdoor Annual Budget:
5,000 sq ft * 15 gallons/sq ft = 75,000 gallons
+ 1,000 sq ft * 12 gallons/sq ft = 12,000 gallons
Total Outdoor Allowance 87,000 gallons
Total Annual Budget 171,000 gallons
y u
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y u(indoor/outdoor)
0
5,000
10,000
15,000
20,000
25,000
30,000
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
G a
l l o
n s
ng e am y xamp e
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ng e am y xamp e(continued)
July usage = 30,000 gallons July budget:
7,000 gallons + 87,000 gallons * 20%
July budget = 25,000 gallons
July volume charges for 30,000 gallons usage:Block 1: 0 to 15,000 gallons: 15 Kgal * $1.95 = $29.25
Block 2: 15,000 to 25,000 gal: 10 Kgal * $2.60 = $26.00Block 3: 25,000 to 38,000 gal: 5 Kgal * $5.20 = $26.00
Total July Volume Charges: $81.25
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What’s in Store for 2008
Continue to monitor changes in usage patterns Irrigable area adjustments
Right-of-Way adjustments
Reviewing commercial and industrial budget basis
Average monthly usage
Historical monthly usage
Indoor/outdoor allocations
Continued community involvement
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