Castle Pines North WC Plan2007

• Project Type: Water Conservation Plan
• Applicant: Castle Pines North Metropolitan District
• Project Name: Water Conservation Plan
• Title: Castle Pines North Metropolitan District Water Conservation Plan
• Date: 8/1/2006
• County: Douglas
• Water Conservation - Doc Type: Complete Plan

Section 7
Evaluation and Selection of Conservation Measures and Programs

Assumptions
7,772 kgal total District irrigation
from 2003 to 2005
Conservation goals target an
additional 10% reduction in
irrigation for open space and
maintaining 2005 level in parks and
areas with drip irrigation

Calculation of Water Savings
Per Unit (Water Savings
presented in this table are
cumulative)
Metered savings from 2003 to
2005 x 60% + (2005 metered
pen space usage - 2005 metered
open space usage x 90%)

Total Savings of
Program During
Planning Period
1000 GAL
65,965

2015 Annual
Savings
000 GALNR}
6,597

Annual Savings in
2005 or at onset of
program4
(1000 GALlYR}
4,663

Average Annual
Savings
(1000 GALlYR}
6,597

Estimated Service
Life
Years
10

Total Penetration
at 2015
n/a

Annual
Penetration
n/a

Savings

Target Numbe
of Units per
yea
n/a

Table 7-2 Estimated Wate

Retrofi
Irrigation Efficiency fo
Open Space

17 percent of all single family homes were built prior to 1994 (This does not includes townhomes and apartments). This is before the U.S. Energy Policy Act of 1992 was enforced. In 1994, this Act was enforced, requiring new toilets, urinals, showerhead, and faucets to
be of higher efficiency. Homes older than 1994 tend to have less efficient toilets, showerheads, and faucets. A penetration of 17% assumes that all homes built prior to 1994 have participated in the Rebate Program.
The target number of units refers to the amount of square feet xeriscaped. The penetration rate for HOAs refers to the percentage of HOA irrigated landscape that is xeriscaped.
Tier 4 is the highest level of water usage for the billing rate structure. See Section 2.4. Customers that are at this level are the least efficient with water usage and paying the highest cost for water.
Recent savings for existing programs are provided for 2005, whereas savings for potential new programs are evaluated assuming they would start in 2007.
5 Water savings for the toilet retrofit are multiplied by a reduction factor of 50% (water savings are reduced by one half) to compensate for the assumptions that likely over estimate water savings. Many of the future toilet retrofits will replace post 1994 toilets. Consequently,
savings will not be as high as indicated in the assumption that a post-1994 toilet would replace a pre-1994 toilet of 3 gal/flush. Furthermore, there is no guarantee that residents would purchase low flush toilets for their entire home. In contrast, the water savings calculations
assume that all residents within a home would use low flush toilets. Residents may still use their higher flush toilets further reducing water savings. Conversely, customers have the option of purchasing a 1.0 gallon low flush toilet which could produce higher water savings
then what is assumed for the 1.6 gal/flush toilet. However given the variety of factors that can influence savings, estimates assume a 1.6 gal/flush low flush toilet to be conservative.

7-5

CDM

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