WSP00980

• File Number: 8143.800
• Description: John Martin Reservoir - Water Sales and Contracts
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1997
• Title: Report of the Colorado State Engineer - Concerning Accounting of the Operations of an Offset Account in John Martin Reservoir for Colorado Pumping - 1997 -- Part 1 of 2
• Water Supply Pro - Doc Type: Report/Study

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Mr. Don Higbee and Mr. David L. Pope
October 14, 1997

Page 2

river reaches where no replacements or only partial replacements were made to replace out-of-
priority depletions to senior surface water rights in Colorado.

Table 3 shows the remaining stream depletions caused by irrigation pwnping in excess of the
pre-Compact entitlements which were not replaced by making replacements to senior surface
water rights in Colorado. These stream depletions were computed using the wellhead depletions
shown in Table 2 with the Ground Water Accounting Model. Please note that in Reaches 14, 15,
and 16, replacements to senior surface water rights in Colorado replaced 0.0% of the stream
depletions caused by pwnping affecting those reaches. This percentage reflects the fact that there
was a call by a Colorado surface water right in those three reaches on none of the 31 days during
August. The remaining depletions shown in Table 3 are the estimated stream depletions caused
by irrigation pwnping in excess of the pre-Compact entitlements remaining after replacements
were made to senior surface water rights in Colorado. Table 3 also shows the estimated
depletions to usable Stateline flow, which were calculated using the asswnptions in paragraph
5.B of the Resolution, and the replacements to Stateline flows which were made during the
month.

Several deliveries of water to the Offset Account were made during August, 1997. The first was
a transfer of water from the Lower Arkansas Water Management Association (LA WMA) X- Y /
Graham Article II account in John Martin Reservoir to the Offset Account. The delivery was
described in my letter to the Kansas Chief Engineer dated August 6, 1997 and resulted in an
addition of2200 acre-feet of fully conswnable water and 1800 acre-feet of return flow water to
the Offset Account. The second delivery was described in my letter dated August 19, 1997 and
resulted in an addition of 1003.24 acre-feet of fully conswnable water to the Offset Account. The
delivery of water to the Offset Account from the Highland Canal which started at 0900 hours on
14 July, 1997 continued through the month of August. This delivery was described in my letter
to the Kansas Chief Engineer dated August 25, 1997. My letter dated October 9, 1997 provides
the summary of the deliveries from this source for the months of July, August, and September,
1997. The deliveries in August resulted in an addition of 1341.88 acre-feet of fully conswnable
water and 70.39 acre-feet of return flow water to the Offset Account. Finally, a release of water
. was made from the Offset Account from 0900 hours, August 28, 1997 to 1530 hours, September
2,;1997 .My letter dated October 9, 1997 described the details of this release. A total of 1565.9
acre-feet of !\lILy copswnable water was released from the Offset Account which produced a
credit of 1362.3 acre-feet at the Stateline. As of September 2, 1997,4917.67 acre-feet of water
was being stored in the Offset Account, 3074.05 acre-feet of fully consumable water and 1843.62
acre feet of return flow water.

Please contact me if you have any questions or require additional information.