WSP07965

• File Number: 8446
• Description: Cache La Poudre Project
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 7/1/1983
• Title: Cache La Poudre Project Study and Related Correspondence
• Water Supply Pro - Doc Type: Report/Study

Preliminary
Alternative No.

Major Features

Grey Mountain Reservoir

2

Grey Mountain Reservoir-Idylwilde Reservoir

3

Grey Mountain Reservoir-Elkhorn Reservoir

4

New Seaman Reservoir-Indian Meadows Reservoir-
Rockwell Reservoir

5

New Seaman Reservoir-Indian Meadows Reservoir-
Rockwell Reservoir

6

Grey Mountain ~eservoir-Indian Meadows Reservoir-
Rockwell Reservpir-upper Poudre Reservoir

Comments received from
at public meetings held to
alternatives which would
development in the canyon.

the study advi~ory committee and from the public,
explain the study, resulted in the addition of two
have a lesser degree of impact on existing
These two alternatives were:

Preliminary
Alternative No.

J.tajor Features
I

7

New Seaman Resarvoir-Elkhorn Reservoir

8

Elkhorn Reservoir

E. INALOATIQ!iI OF ALTERNATIVBS

Two sets of evaluation factors, monetary and non-monetary, were used in
evaluating the eight preliminary alternatives in Phase I of the study. The
monetary factors consisted of: (1) initi~l investment costs, (2) benefit-cost
ratios, (3) net direct economic benefits ~nd (4) cost effectiveness expressed
in terlns of project costs per kilowatt elf installed generation capacity and
costs per acre-foot of storage. The non-monetary factors used were: (1)
geologic conditions, (2) impacts from inundation at each reservoir site and
(3) increased water yield of "new water~ developed as a result of project
implementation. These evaluation factors 'were selected in accordance with the
study mandate which was to assess the englneering and economic feasibility of
. '
a potent1al Cache la Poudre Project.

At the completion of Phase I, the CWCB selected Alternatives 1, 2, 7 and 8
for further analysis in Phase II of the study. The four selected alternatives
represent two important development concepts. Alternatives 1 and 8 represent
single reservoir systems which provide storage primarily for conservation
purposes (agricultural, municipal and :industrial water demands and the
improved management of existing water 'supplies). Alternatives 2 and 7

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