Calculate ROI's for Water Conservation

How to Calculate ROI’s for Water
Conservation Fixtures,
Equipment and Systems

Troy Aichele
Aichele and Associates, LLC
May 12, 2010

2010 IAPMO / WPC Emerging Technology Symposium - May 11-12, 2010

Objectives
Learn the importance of ROI’s for building
owners

Learn what is necessary to accurately calculate
ROI’s for water efficiency upgrade projects

Learn how to effectively calculate water
efficiency upgrades ROI’s


Importance of ROI’s
1. 5 Year Paybacks represent a 20% return
2. Nothing will move forward without making
financial sense
3. Easier to Sell
4. Connects environmental responsibility with
smart business
5. Easier to gain upper management approval


ROI Calculation Requirements
1. Water, Waste, Natural Gas and Electrical Utility
Costs
2. Fixture / Equipment Counts
3. Fixture / Equipment Use Rates
4. Facility Work Days and Occupancy
5. Know Facility Hot Water Creation Method
6. Efficiency Upgrade Installation Cost
7. Estimated Annual Utility Rate Increase
8. Rebate Potential


Utility Costs
Obtain Utility Rates (1 Year Minimum)
– Water and Waste (CCF)
– Electric (kWh)
– Natural Gas
(therm)


Fixture / Equipment Counts
Walk Campus
– Obtain facility drawings
– Reserve enough time
(Depends on size of building)


Use Rates
Water Closet:
– 3 / Day (Women)
– 1 / Day (Men)*
Urinal:
– 2 / Day (Men)
Faucets:
– 1 Minute / Person / Day
Shower Use:
– 8 Minutes / Day

*3 / Day if no urinals


Use Rates


Measuring with Bucket and
Stopwatch
Measure twice
and average
Measure 10% of
similar devices
throughout facility


Plumbing Fixtures


Tank-Type Water Closets


Flushometer Water Closets


Dual-Flush Flushometer
Retrofit Kits


Urinals


Faucets


Showerheads


Kitchen Spray Nozzles


Plumbing
Equipment


Major Equipment
Record Manufacturer,
Model Number, Serial
Number, Flow Rates
and Electrical
Information
(especially booster
heater) and use rates


Ice-Makers, Air-Conditioning and
Refrigeration Equipment


Laundry Machines


Medical Vacuum Pumps


Plumbing
Systems


Boiler Stack Economizer
Water Recovery

Cost: $1,090
Water / Sewer Savings: 720 GPD
Return on Investment: 5 Months

Installation Cost


Utility Rate Trends…
Utility Rate Trends 10 %
10%
$9.00

$8.00

$7.00

$6.00

$5.00

$4.00

$3.00

$2.00
Water
Peak
$1.00 Water
$/CCF
$-
Waste
Sewer
$/CCF
2002 2003 2004 2005 2006 2007 2008 2009
Year

The Cost of Water and
Sewer / 100 Gallons
Olympia, WA: $1.00
San Diego, CA: $1.38
Boston, MA: $1.05
El Paso, TX: $0.60
Omaha, NE: $0.53
Geneva, Switzerland: $1.95
Glasgow, UK: $2.86
Las Vegas, NV: $0.80
Source: “The World’s Water 2008-2009” by Peter H. Gleick


Activity


Rainwater Harvesting
Assumptions:
– $1 / Gallon Installed
– System Size: 10,000 Gallons
– 50” Rain / Year
– 2,500 SF Roof
– 0.62 Gallons / SF of Roof / Inch of Rain per Year
– 85% Collection Efficiency
– Water Cost: $0.0025 / Gallon
– Sewer Cost: $0.0075 / Gallon

What is the ROI?


Calculate ROI's for Water Conservation

Calculate ROI's for Water Conservation

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