WSP04999

• File Number: 8054
• Description: Water Salvage
• State: CO
• Basin: Statewide
• Date: 6/1/1975
• Author: Utah Water Research
• Title: Water Salvage Potentials in Utah - Volume II - Evaporation Suppression by Reservoir Destratification
• Water Supply Pro - Doc Type: Report/Study

75 95 % p (.059 < b < .122)
98 % P (.043 < m < .058)
SUPP= .0902 + .0507 (liT) R2=.77

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Figure 7. DaDy meaauremenlll of Inppraalon/wiater temperalDre change fnncdon.

tant interaction which may be used as an example
is the atmospheric vapor pressure and saturation
vapor pressure relationship. If the saturation vapor
pressure of the cooled pan is close to the
atmospheric vapor pressure, an additional decrease
in the saturation vapor pressure value may make it
equal to the vapor pressure of the atmosphere. In
this case evaporation will be negligible, and
suppression will be at 100 percent. This condition
would not be predicted by the model. Considera-
tion of interactions such as these indicates that
suppression values may be determined by a limiting
factor which has not been modeled.

Temperature measurements used in the
suppression calculations were an average of the

entire days measurements. Therefore, the change
in temperature was based on night as well as day
time temperature. Night time evaporation has been
shown to vary from zero (or even negative) to
significant amounts depending on the location and
season (Patel. 1963). Because ofthis, the change in
temperature, based on the cool night temperatures,
may introduce nonlinearities which will cause error
in daily averages.

Wind measurements would also show a similar
pattern. Since wind was read once a day in total
miles per day, the readings could not be broken
into hourly patterns. The evaporation station was
located at the mouth of Logan Canyon. This area
was subject to morning and night drainage winds

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