BOARD01143

• Board Meeting Date: 12/11/1953
• Description: Minutes and Resolution
• Board Meetings - Doc Type: Meeting

300

Feasibility grade reports would be necessary for expansion
or inclusion of other purposes in Curecanti Reservoir so far as
the overall report on the Storage Project is concerned. With re-
spect to provision in Federal water resources programs and pro-
jects for future requirements, Circular No. A-47 states:

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"Vlhere a significant saving will result from inclusion in
the original plan for a program or project of additional or en-
larged structures, facilities, or parts thereof which will
serve anticipated future non-Federal needs, as for example,
excess storage capacity in reservoirS for municipal or indus-
trial water supply, provision for such inclusion m~ be made
if:

a. The cost of including the facilities for antici-
pated future heeds, including the properly allo-
cable part of the joint costs of the program or
project, represent not more than 15 percent of
the total construction costs of the program or
project.

b. All financial costs of such additions will be re-
paid within 50 years after the date on which initial
use of such addition is begun', regardless of the
degree to which the full capacity provided is uti-
lized during the period. In arriving at the financial
costs of such additions, interest on the construction
costs during the period of deferral of any use m~
be waived.

c. Reasonable assurance is given by local interests at
the time the project report is prepared that initial
use of the proposed addition to the program' or pro-
ject will begih within not more than 10 years, and
a repayment contract is signed by local interests
prior to the beginning of construction agreeing to
start repayment with such lO-year period."

For the purpose of exploring the possible promotion of feasi-
bility, some of the purposes for which the reservoir might be used
vlere considered. Estimates arrived at were necessarily very rough,
with the principal objective being an understanding of what might
be expected to result from more detailed studies,

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According to available data, there is a difference in ele-
vation between Curecanti dam site and Crystal dam site of 585 feet.
A tunnel 12 miles in length between the two sites, vlith a capacity
,of 1700 c.f.s. was considered. With an allocation to power in
Curecanti reservoir of not more than $29,000,000, and an instal-
lation of 90,000 k.w. at the Crystal site, it was 'estimated that a
power cost of about 8 mills might result from such construction.
The cost estimate of $40,000,000 for the tunnel would, of course,
be subject to revision upon detailed study. Subsequently it was
found that the tunnel length Sh~lld have been about 15 miles long,
and the estimated cost thereof about $50,000,000. Correction for
this item would show an average power cost of about 9.5 mills.