Aurora 2007 WCPlan

• Project Type: Water Conservation Plan
• Applicant: City of Aurora
• Project Name: City of Aurora Water Conservation Plan
• Title: Water Conservation Plan Aurora Water Aurora, Colorado
• Date: 8/8/2007
• County: Arapahoe
• Water Conservation - Doc Type: Complete Plan

40,000 acre-feet of remaining storage or 25 percent of available capacity. This is considered to
be a limiting condition for determining water availability.

Reliability issues based on recent and forecasted drought conditions are currently addressed by
demand modification strategies (water restrictions) and short-term leasing such as those used in
2004 and 2005 when Aurora Water leased agricultural water from the High Line Canal in the
Arl<ansas River basin.

This yield cap of the existing water rights portfolio along with hydraulic capacity of the existing
treatment plants are the primary drivers for timing and sizing of Prairie Waters Project (PWP)
(For more information see section "Proposed Water Supply Projects" pg. 16). Until those new
sources of water can be delivered to the City, Aurora Water will maintain its current strategies
for water restrictions, leases and reservoir releases to provide adequate levels of service under
drought conditions.

Table 2: Summary of system conditions, Aurora Water

Planning Questions Yes No Comments
Is the system in a designated critical water supply area? X
Does the system experience frequency shortages or supply X
emergencies?
Does the system have substantial unaccounted-for and lost X
water?
Is the system experiencing a high rate of population and/or X
demand growth?
Is the system planning substantial improvements or additions? X
Are increases to wastewater system capacity anticipated within X
the planning horizon?

Baseline Water Use

Water use in Aurora in 2005 and 2006 is shown in Table 3. Usage increased in 2006 as nearly
2,000 customers were added to the system. The average demand of 2005 and 2006 was selected
as the baseline demand to use for forecasting purposes. Baseline water use in Aurora for this
study is 51,797 acre-feet (AF) per year.

Table 3: Total water demand in 2005 and 2006, Aurora Water

Year Total # of Total Demand Total Demand

Accounts (kgal) (AF)

2005 69,463 16,588,529 50,885

2006 71,351 17,182,826 52,708

Two-Year Average 70,407 16,885,678 51,797
~ lncludes treated, raw, tertIary, and reuse sales. lotal # ot accounts equals the accounts bIlled. 1 he actual nUlnber ot accounts In 2UU5 and 2006

were 72,358 and 74,000 respectively.

Figure 2 shows the treated water demand and per capita demand in Aurora from 1998 to 2006.
The drought impacts of 2002 - 2006 are clearly evident and Aurora has implemented some form

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