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<br />TABLE 8 -8
<br />CRITERIA FOR ANALYSIS AND DESIGN
<br />FUTURE WATER DISTRIBUTION FACILITIES
<br />The water distribution system was evaluated based on watermain size, leakage, static pressures, and
<br />operational capabilities. A computer model was utilized to simulate the system's response to peak
<br />demands, fire fighting requirements, and overnight tank refill. Specifically, these conditions include
<br />average day, peak day with a fire demand, peak hour, and tank refill with minimal overnight water use.
<br />Each condition stresses the system differently and helps to identify actual conditions of operations which
<br />cause poor levels of performance. The City of Lino Lakes' distribution system piping network consists of
<br />10 inch through 16 inch diameter trunk transmission mains, and 4 inch through 8 inch diameter lateral
<br />distribution mains, as shown Figure 8 -1 above. A small number of the 4" pipes will need to be replaced.
<br />Most of the City watermains were constructed of cast iron or ductile iron pipe, and conform to the
<br />8 -14
<br />2007
<br />2010
<br />2020
<br />2030
<br />Population Served by Water
<br />System
<br />14,493
<br />17,550
<br />26,135
<br />34,208
<br />Average Dav Water
<br />Demand
<br />Gallons per day (gpd)
<br />1,617,534
<br />1,842,75
<br />0
<br />2,482,82
<br />5
<br />3,078,72
<br />0
<br />Gallons per capita per day
<br />(gpcd)
<br />112
<br />105
<br />95
<br />90
<br />Gallons per minute (gpm)
<br />1,123
<br />1,280
<br />1,724
<br />2,138
<br />Peak Day Water Demand
<br />Gallons per day (gpd)
<br />6,124,000
<br />6,142,50
<br />0
<br />7,187,12
<br />5
<br />8,552,00
<br />0
<br />Peak to Average Day Ratio
<br />3.78
<br />3.33
<br />2.90
<br />2.78
<br />Gallons •er minute ••m
<br />4,253
<br />4,266
<br />4,991
<br />5,939
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<br />Storage Requirements
<br />Peak Day Equalization
<br />hours
<br />plus 3,500 gpm fire flow for 4
<br />Pressure Requirements
<br />Nominal Working: 50 -70 psi Minimum: 35 psi
<br />Minimum, at Fire Flow
<br />Withdrawal
<br />20 psi
<br />Maximum Pressure
<br />100 psi
<br />FUTURE WATER DISTRIBUTION FACILITIES
<br />The water distribution system was evaluated based on watermain size, leakage, static pressures, and
<br />operational capabilities. A computer model was utilized to simulate the system's response to peak
<br />demands, fire fighting requirements, and overnight tank refill. Specifically, these conditions include
<br />average day, peak day with a fire demand, peak hour, and tank refill with minimal overnight water use.
<br />Each condition stresses the system differently and helps to identify actual conditions of operations which
<br />cause poor levels of performance. The City of Lino Lakes' distribution system piping network consists of
<br />10 inch through 16 inch diameter trunk transmission mains, and 4 inch through 8 inch diameter lateral
<br />distribution mains, as shown Figure 8 -1 above. A small number of the 4" pipes will need to be replaced.
<br />Most of the City watermains were constructed of cast iron or ductile iron pipe, and conform to the
<br />8 -14
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