PROJ00137

• Contract/PO #: C153467
• Contractor Name: Greeley, City of
• Contract Type: Loan
• Water District: 0
• County: Weld
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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Table IV;2
Average Monthly Demand Pattern for the Peri od 1981.1985

Month

Percent of Annual Demand

January
February
r~arch
April
r~ay
June
July
August
September
October
November
December

5
5
5
8
9
12
15
14
11
6
5
5

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The historical and projected maximum day demands within the City of Greeley
water service area are shown on Table IV.3 for the period from 1971 to 2015.
The Table also displays the precipitation which occurred during the April 1 to
September 30 irrigation season. For the historical period, the maximum day
demand averaged 39.3 mgd, and the irrigation season precipitati on averaged
10.12 inches; The 1985 maximum day use was 43.4 mgd, but the largest daily
demand on record was the 47.4 mgd which occurred in 1980.

Maximum day demands are important because water treatment facilities are
desi gned based on thei r capaci ty to produce treated water. The projected
values from 1990 to 2015 were calculated by multiplying the projected average
annual daily demand by a peaking factor of 2.4. This is the average peaking
factor over the 1 ast 15 years for the Ci ty of Greel ey water system. The
maximum daily demand projected for the year 2015 is 83.0 mgd.

The peak hourly rates are important as the basi s for si zi ng di stributi on
works. Over the 1 ast fi ve years, the maximum hourly rate of consumpti on
ranged from a low of 65.9 mgd in 1985, to a hi gh of 78.8 mgd in 1981; The
average for the 1981 to 1985 peri od was 73.5 mgd, or about 400 percent of the
average daily consumption.

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