PROJ02073

• Contract/PO #: C153686
• Contractor Name: Red Mesa Ward Reservoir and Ditch Company
• Contract Type: Grant
• Water District: 0
• Bill Number: HB 95-1155
• Loan Projects - Doc Type: Feasibility Study

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~ Column (20) is the sum of the ditch diversions in columns (2) to (13). The ditch
diversions from November 1 to March 31 are not considered because they would be out
of priority for irrigation water; it is assumed that stock water could be obtained from
return flow which is not accounted for in this analysis.

~ Column (21) is the Hesperus Gage minus the sum ofthe ditch diversions in Column (20)

~ Column (22) is the estimated amount that could be diverted to Red Mesa Reservoir and is
determined depending upon the amounts in columns (17) to (20):
o if the river is on call the diversion is zero,
o from December 1 to February 15, the flow at the Hesperus gage is diverted,
o from February 15 to March 31 and the month of November, generally the
Hesperus Gage flow can be diverted even though the Compact is technically in
effect the river is not operated under the Compact conditions,
o from April 1 to October 31, the compact requirements are met except that 80 cfs
is provided at the Stateline rather than 100 cfs, the historic ditch diversions in
columns (2) to (13) are subtracted from the Hesperus Gage, if there is any water
left after meeting these criteria it is diverted to the reservoir,
o the diversion to Red Mesa from the LaPlata River cannot be less than 4 cfs or
greater than 120 cfs.

~ Columns (23) to (26) are the operation of the reservoir. Column (23) is the inflow to the
reservoir in acre-feet and is column (21) times 1.984.

~ Column (24) is the release for 1,140 acres of irrigation as described above. Releases
from the reservoir for irrigation begin when the Freed/Revival/Vossberg Ditches cannot
divert directly from the river. If the reservoir is below 200 acre-feet of capacity,
irrigation releases are stopped.

~ Column (25) is the 330 acre-foot release for municipal, domestic, augmentation water
which is 0.9 acre-feet per day. This water is never shorted.

~ Column (26) is included for evaporation and other losses but the reduction is account for
when each share is called. The water each share receives is reduced for evaporation and
other losses by 10%.

~ Column (27) is the end-of -day (E-O-D) reservoir content.

~ Column (28) is the spill, actually not spill from the reservoir but water that would not be
diverted.

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