WSP00381

• File Number: 8143.600.10
• Description: John Martin Reservoir
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1981
• Title: Analysis of John Martin Reservoir
• Water Supply Pro - Doc Type: Report/Study

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Page 7

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 - 148.82)x 1000)) in average District 67 diversions

since t:he 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- I.

term trend has been an increase of 10,820 acre-feet per year

.

((228.56 - 217.74)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 percent 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