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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Sys tem Capaci ty

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Knowledge of the approximate capacities of the various elements
of the water system is a valuable guide to planning future system
improvements. Although only approximate estimates are possible, they
none the less show the order in which elements of the system will
require attention as the demand increases. An updated version of a
table which appeared in the 1959 Morrill Report reciting the
capacities of the water supply and transmission system is shown in
Table 1II-5.

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The revised capacities take into account changes in the
collection system such as rehabilitation of the original Delta
Pipeline, the proposed Oak Creek Diversion, dual lines at the
Gunnison River crossing, and other improvements made since 1959.
All pipeline capacities were computed by using the Hazen-Williams
formula with C = 100 to account for roughness in the old pipe.
The calculation of the capacity of the original Delta Pipeline
was based on 6-inch pipe and the Manning formula with n = 0.015.
Slope determinations necessary for calculating the capacities were
based entirely on contour maps published by the U. S. Geological
Survey. These maps were not available in the 1959 investigation
and are more accurate for making reasonable estimates of transmission
pipeline capacity than the altimeter readings used in the previous
investigation. However, these estimates are believed to be on
the high side and actual capacities may even be less. In 1974,
for example, an experiment was made to determine how much water
could be crowded into the Doughspoon Aqueduct. With the inlet
submerged, only 1.86 c.f.s. was actually measured in the weir
box above the junction with the Dirty George Creek Aqueduct.

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Mesa
shown

Profiles
based on
in Figure

of the raw
topographic
1II-15.

water
maps

transmission pipelines on Grand
and used in the calculations are

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III - 24

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