PROJ00001

• Contract/PO #: C153168
• Contractor Name: Delta, City of
• Contract Type: Loan
• Water District: 40
• County: Delta
• Bill Number: SB 77-35
• Loan Projects - Doc Type: Feasibility Study

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For comparison to treatment plant effluent, the average quan-
tity of water supplied from Grand Mesa on a monthly basis is also
shown on the graph as a series of dashed horizontal lines. This
quantity is based on flow measurements taken daily at a cippolitti
weir located in the main stem of the collection system just ahead of
the Delta Control Reservoir which we have averaged for each month of
the year. The supply from Grand Mesa is very closely regulated to
maintain water stored in the Delta Control Reservoir at the high
water level. Thus, except for periods in the spring when the Delta
Control Reservoir might be spilling, the supply very nearly matches
the filter plant effluent.

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A study of the daily filter plant effluent records was
made to determine the relationships in production between peak
periods and average periods particular to Delta. This information
will be useful in preparing the water use forecast which will
appear in the next section. A summary of average and maximum
water production at the filtration plant by year, month, week,
day and hour for each year is shown in Table 111-3. Based on
these actual production records, the ratio of maximum month produc-
tion to average monthly production for the City of Delta was found to
be approximately 1.50 to 1. The ratio of maximum week production to
average weekly production was approximately 1.60 to 1. The ratio of
maximum day to average daily production was generally 1.70 to 1.

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