CRC_SlowTheFlowPhase2_ImpactAnalysis

• Water Efficiency Grant Type: Public Education & Outreach Grant
• Contract/PO #: OE PDA 07-21
• Applicant: Center for Resource Conservation
• Project Name: Slow the Flow Colorado 2006: Irrigation Audit Program
• Title: Irrigation Inspection Program: Impacts of Slow the Flow Colorado on Outdoor Water Use
• Date: 6/1/2007
• County: Boulder
• Water Efficiency - Doc Type: Interim Reports

Households Watering Above ET Prior to Inspection

Differen:e ofPre-Auit and Rtit-Auit Olkbor ~r Uage of2004AG>EI
Expessed as 0/6 EI

30%
25%
~ 20%
~
=
~
= 15%
~
~
.. 10%
~
5%
0%
o\f/o j:,(f /0)
lj\l ~o/Oy
\-

~(f 1-0)
tJPo 1 Oy ,.
\-

~(f 1-0)
\oo/~

EPo~
\A(f/~

\ o\f 1-0)
\cc,(f 1 ~

0/0 EfIIfference

. 2004AGoEr

Roughly 1/3 of participants were watering above ET prior to receiving an inspection.
When comparing the watering habits of properties that were watering above ET prior to
the inspection with their watering habits after the inspection, a statistically significant
reduction in water usage was observed. The largest group of people reduced their water
usage by 20 to 40 percentage points, with the second largest group of people reducing
their water usage by 0 to 20 percentage points. Although these properties did in fact
reduce their water usage, many of the properties were still over-watering. However, they
were over-watering by much less.

Households Watering Below ET Prior to Inspection

Differen:e ofPre-Auit and Rtit-Auit Olkbor ~r Uage of2004AG<EI
Expessed as O/oEI

35%
300~
25%
200~
~
~
= 15%
~
= 100~
~
~
.. 5%
~
OO~
o\f/o j:,(f 1-0)
lj\l ~o/Oy
\-

~(f 1-0)
tJPo 1 Oy ,.
\-

~(f 1-0)
\oo/~

EPo~
\A(f/~

o\f 1-0)
\cc,(f 1 ~ \I

0/0 EfIIfference

. 2004AG::Ef

Roughly 2/3 of properties were watering below ET prior to the inspection. As can be
expected from this group, since they were already watering below ET, we did not see a
reduction in water use. The trend was to water closer to actual ET rates, resulting in
healthier landscapes and more efficient water use.

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