WSP07251

• File Number: 8143.600.10.A
• Description: John Martin Reservoir - Operation Studies
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1981
• Author: Zorich/Spronk Assoc
• Title: Analysis of John Martin Reservoir Operation
• Water Supply Pro - Doc Type: Report/Study

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ZORICH, SPRONK a ASSOCIATES, INC.

Page 7

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of the Compact. The lines, and the slope indicated for each
line segment, were calculated by applying the least squares
method to the data contained in Table 1.
Figure 1 is a mass diagram of the Combined District 67 di-
versions. The slope of the post-Compact line segment is less
than that for the pre-Compact line segment, indicating that the
long-term trend has been a reduction of 10,500 acre-feet per
year ((159,32 - l48.82)x 1000)) in average District 67 diversions
since the Compact was adopted.
Figure 2 is a mass diagram of the Fort Lyon Canal diversions.
The slope of the post-Compact line segment is greater than the
slope of the pre-Compact line segment, indicating that the long-
term trend has been an increase of 10,820 acre-feet per year
((228.56 - 2l7.74)x 1000)) in average Fort Lyon diversions since
the Compact was adopted,
Figure 3 is a double mass diagram showing the relationship
between annual Fort Lyon and District 67 diversions. The slope
of the two line segments indicate that the average annual Fort
Lyon diversions were 1,37 times greater than the average Dis-
trict 67 diversions prior to adoption of the Compact, and 1.52
times greater thereafter. The long-term trends reflect a re-
duction of approximately 10 perc€nt in the annual average
District 67 diversions (relative to the Fort Lyon Canal diversions
made before adoption of the Compact) during the time period after
the Compact was adopted,
An analysis of the relationship between the Arkansas River
flows at the upstream and downstream ends of Districts 14 and 17

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