Rifle_WCPlan2008

• Project Type: Water Conservation Plan
• Contract/PO #: OE PDA 08-17
• Applicant: City of Rifle
• Project Name: City of Rifle Water Conservation Plan
• Title: City of Rifle Water Conservation Plan Final Report - July 2008
• Date: 7/1/2008
• County: Garfield
• Water Conservation - Doc Type: Complete Plan

City of Rifle Water Conservation Plan
Final Report -July 2008
driven by the need to meet peak demands. Therefore, by reducing peak demands, system
requirements, including the amount of augmentation water needed and the capacity of
water delivery infrastructure, can be downsized and costs reduced. Peak demands are
presented here under "water production" because flow meters at the treatment plants are
the only places where daily measurements of water produced are made, and thus, are the
only places where short-term water demand is gauged. In general, the two treatment
plants are run at a steady rate throughout any given day in order to produce
approximately the amount of water to be consumed. Figure 2-1 illustrates the magnitude
of peak potable water demand in Rifle in 2007 for various peaking durations, ranging
from one day (called "peak day") to 30 days ("peak month") as compared to the average
annual demand ("average day"). The figure shows that the ratio of the peak day and peak
month demands to the average day demand ranged from about 2.4 to 2.1, typical values
for Rifle. The 2006 Water Master Plan found amulti-year average peak day to average
day demand ratio of 2.56 for Rifle's potable system.
City of Rifle 2007 Peak Water Demands by Duration
4.50
Values represent the highest running average water demand for a period of
time of the length shown on the x-axis during 2007. For example, the maximum
4-day average demand during any 4 consecutive days in Rifle in 2007 was 3.68
4.00 mgd. By the same token the peak day demand was 3.97 mgd. "Demands" here
are represented by total water plant production and net deliveries out of
3.50
^. 3.00
~ Avg.
~ Ann.
~_
~ 2.50 Dmd
c
~ 1.65
~ ----
~ 2.00
L
1.50
1.00
0.50
0.00 "
Daily 2-day 3-day 4-day 5-day 6-day 1-week 2-week 3-week 30-day
Figure 2-1:2007 Potable Water Demand Peaking
Rifle's peak water demands are driven by outdoor water use during the irrigation season,
as illustrated by Figure 2-2. Average water demand during core non-irrigation season
months (December through February) is a good indicator of indoor water use.
Considering this along with lost water volumes, two key points can be made:
• Almost 50% of the annual potable water volume delivered to Rifle customers is used
outdoors.
~ Approximately 75% of the water production/treatment capacity needed to meet peak
day demand is to supply water for outdoor uses.
SGM # 99055A-388 14 Historic Water Use and Forecast Demand