WSP02900

• File Number: 8220.101.08
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 10/1/1994
• Author: Western Area Power A
• Title: Glen Canyon Dam Interim Operations - Estimated Net Expense - April 1994 through Sepyember 1994
• Water Supply Pro - Doc Type: Report/Study

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Each page within the packet contains: (1) a strip chart of real-time
Glen Canyon Dam operations during the ramping event, (2) a graph of the
USGS Lee's Ferry Gauge showing river elevation during the ramping event,
(3) a graph of hourly integrated Glen Canyon Dam generation during the
ramping event, and (4) a brief written explanation of the ramping event.

For the study period, 114 instances of deviations were found. Most of
the conditions were caused by more than one factor: (e.g., control area
regulation and imports/exports different than pre-schedule), therefore,
multiple variations can be explained by one anomaly.

The following table summarizes the causes and frequency of the 114
deviations:

"

Primary Cause(s) of Deviation

Number
Of Instances

Percent
Of Events

,0

Control Area Regulation
Control Area Disturbance
CRSP Resource Availability
Aspinall Operations
Flaming Gorge Operations
Imports/Exports Different than Pre-schedule
Other

49/114
4/114
17/114
8/114
1/114
13/114
22/114

43
4
15
7
1
11
19

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EXPENSES

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A. Net Expense

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The estimated net expense of interim releases for April through
September 1994 are summarized below:

Net Expense

April 1994
May 1994 .
June 1994 .
July 1994 .
August 1994 ,
September 1994

$281,420
$328,093
$421,262
$510,924
$574,955
$489,742

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Attached are Tables 1 through 6 detailing the net expense analysis
by component for April through September 1994.

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