WSP07002

• File Number: 8449
• Description: Platte River Studies
• State: CO
• Basin: South Platte
• Date: 2/1/1991
• Author: City of Greeley
• Title: Feasibility Study for Rehabilitation of Hourglass Dam and Reservoir Vol. 1
• Water Supply Pro - Doc Type: Publication

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TABlE 4.3
HISTORIC\L AND FUTURE MAXIMUM DAILY DEMANDS

, ',',INCHES OF, '. ..
.., .... ..
. ...
... . ..
.. , . . . .. .
, ' ,
.. , PRECIPITATION ' MAxtMUMDAIl:'Y LISE
..
YEAR .., ',"APRIL1TO (MGD).,"
SEPTEMBER 30 "
1971 10.37 31.6
1972 8.07 32,0
1973 8.69 33.5
1974 9,21 34.8
1975 12.98 37.6
1976 9.88 39,3
1977 8,49 35.8
1978 10,39 41,0
1979 11.07 44.2
1980 7.41 47.4
1981 11,27 40,0
1982 11,27 44.2
1983 15.19 41,4
1984 8.94 43.3
1985 8,52 43,4
1990 49,0
1995 , 46.9
2000 63.1
2005 69.1
2010 75.6
2015 83.0

Maximum day demands are required for water treatment facility design. The projected daily
demands from 1990 to 2015 are calculated by multiplying the projected average annual daily
demand by a peaking faclor of 2.4, This is the average peaking factor over the last 15 years
for the City of Greeley water system, The maximum daily demand projected for the year 2015
is 83,0 mgd including the demand factors for 1985-1989 only changes tt to 2,33. an Insignificant
difference.

The peak hourly rates are used for sizing diS1ributlon works, Over the last five years. lhe
maximum hourly rale of consumplion ranged from a low of 65.9 mgd in 1985. 10 a high of 89.3
mgd in 1989, The average for the 1985 to 1989 period was 80,6 mgd. or about 380 percenl
of the average daily consumption,

4-4