WSP09393

• File Number: 8143.700
• Description: John Martin Reservoir - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1999
• Title: Annual Report of the Operations Secretary - Concerning the Operation of John Martin Reservoir - 1999 -- Part 1 of 2
• Water Supply Pro - Doc Type: Annual Report

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Mr. David Brenn and Mr. James Rogers
December I, 1999

Page 3

Conservation storage was resumed at 0900 hour on April 30, 1999 due to inflow
conditions at that time. Consistent with the provisions of Section II B (3) of the 1980
Operation Plan transfers from conservation storage into Section II accounts was initiated
at 0900 hour on May 2, 1999. This transfer was initiated at the rate of 1250 cfs. and
continued at that rate throughout the remainder of the compact year.

At 1500 hour on May 2, 1999, the Corps. of Engineers determined that the
reservoir content had reached the level of maximum allowable invasion of the flood pool
by the permanent recreation pool and asserted control of operations for flood control
purposes. This maximum allowable invasion content was adjusted due to additional
permanent pool storage which occurred on May 3 and May 4, 1999 pursuant to the
Colorado Division of Wildlife's Muddy Creek Reservoir decree as provided for by the
August 14, 1976 resolution of the Arkansas River Compact Administration.

After the reservoir content reached the level of maximum allowable invasion of
the flood pool by the permanent recreation pool, inflows continued to accrue to
conservation storage (Summer Compact Account) pursuant to Section II B of the 1980
Operating Plan. As conservation storage increased, water in other accounts within the
conservation pool were displaced into the flood pool at the rate of computed inflow and
according to the order of spill provided in Section II G of the 1980 Operating Plan and as
revised by paragraph 13 of the Resolution Concerning An Offset Account in Jolm Martin
Reservoir for Colorado Pumping as amended March 30, 1998.

Diversions of stream flows (primarily to storage) upstream of Jolm Martin
Reservoir under post-compact water rights occurred beginning on April 29, 1999. The
effect of such diversions was to reduce the inflow to Jolm Martin Reservoir and the total
volume of water that otherwise would have physically spilled from Jolm Martin
Reservoir. In order to compensate for reduced inflow to conservation storage an
adjustment was calculated to determine the amount and timing of additional inflow to
Jolm Martin Reservoir that would have occurred but for the upstream diversions. See
spreadsheet documenting the determination of these adjustments in Section 2 of this
report. A release (transfer) equal to this adjustment was then made from the actively
spilling account to conservation storage. Thus, accruals to conservation storage occurred
at the rate of adjusted inflow until the spill of all accounts was completed on June 4,
1999.

Therefore, as has been done in previous reports of the Operations Secretary and as
is described above, the accounting during periods of spill contained in this report reflect
the depletion of the actively spilling accounts as being due to the combined effects of
inflow and adjustments for upstream, post-compact diversions of stream flow. In this
manner 34,244.09 a.f. are shown to have been released from the Section (Article) III
account and 5,985.95 a.f. from the offset account as of 1122 hours on May 3, 1999. At
that moment of initiation of spill from Section II accounts the content of each was