WSP06720

• File Number: 8111.831
• Description: Arkansas River Compact Administration - Article VIII Investigations
• Basin: Arkansas
• Date: 1/1/1985
• Author: David Pope
• Title: Report to the ARCA regarding Article VIII ‎(H)‎ Investigation of Alleged Violations of the Arkansas River Compact
• Water Supply Pro - Doc Type: Publication

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

14

The flows at the various locations considered can be compared for

the various periods discussed above by computing the averages for

each period.

In comparing the average pre- and post-compact flows

at a location, the absolute magnitude of changes can be quanti-

fied, Table 9 shows the average annual flows at each location for

the pre-compact, 1949-1973, and 1974-1984 periods.

Tables 10 and

11 show the averages for the same periods for the winter and

summer seasons, respectively,

The annual usable stateline flow

averaged 121,300 acre-feet per year for the post-compact period

until 1973., but averaged only 72,600 acre-feet per year for 1974

to 1984, or 60% of the 1949-1973 average,

The absolute decline

was 48,700 acre-feet per year for this eleven year period. The

last two years of this period were extremely high runoff years and

raised the average considerably,

The winter and summer averages

for 1974-1984, averaged 50% and 63% of the 1949-1973 averages

respectively. The 1949-1973 usable stateline flows averaged 109%

of the pre-compact usable flows,

The Arkansas River at Las Animas annual flows declined from the

pre-compact average of 213,500 acre-feet to 101,500 acre-feet for

The 1974-1984. period average actually in-

However, the winter flows at Las J.

Animas declined from 15,600 to 9,900 acre-feet, in other words

the 1949-1973 period.

creased to 125,900 acre-feet,

37%.

Since these winter flows are always considered inflows to

the conservation pool of John Martin Reservoir, this decline