WSP06927

• File Number: 8220.101.09B
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 7/1/1990
• Author: BOR
• Title: GCD EIS Summary of "Long List" of Alternatives
• Water Supply Pro - Doc Type: EIS

L,~_~ ~~~r~-

"

The "long list" and "short list" will be made available to the
public for information, and a 30-day comment period will be
established. The public will be informed through newsletters and
meetings for discussion and comment.

After the comment period, the EIS team will prepare a working
copy of the preliminary draft EIS Chapter II (Description of
Alternatives) to determine any additional GeES data needs and as
a basis to begin EIS descriptive write-ups and impact analysis.
This draft will be shared with cooperating agencies for review
and comment.

Alternatives may later be adjusted or fine-tuned as information
is compiled and analysis is carried out during preparation of the
draft EIS. Also, public and agency comments on the draft EIS may
influence description of alternatives for the final EIS.

PART 3 - THE NO ACTION ALTERNATIVE

A draft of the "No Action" Alternative was developed to present
at the July 10, 1990 Flagstaff meeting. This alternative was
intended to be a basis for discussion, presenting the type of
information we would like to see in the alternatives developed at
this meeting and also to solicit input into what is needed in a
no action alternative. The No Action alternative was based upon
the existing operations of the project recognizing that the
project has gone through two phases including: Lake Powell
Filling, 1963-1980; Lake Powell, post-filling, 1981 to present.
Under the post filling there are sub-setS for high water, and low
water years. In developing the No Action Alternative the
following 16 criteria were used based on the assumption that
there is no change in the basic operating criteria.

Sbort Term Criteria

1. Flows of 1,000 to 31,500 cfs from Labor Day to Easter and
3,000 to 31,500 cfs from Easter to Labor Day (or up to 1.9
maf per month maximum).

2. Power load following patterns have a single peak in summer
and can have winter bi-modal peaks with up to 20,000 cfs
change in 24 hours.

3. Hourly releases to meet monthly volumes, maintain
established minimum rates, and flow pattern of energy demand
with no constraints on hour-to- hour ramp rates other than
physical constraints. Power demand is higher during on peak
hours, defined as Monday through Saturday, 7 a.m. to 11 p.m.

4