WSP10265

• File Number: 8143.700
• Description: John Martin Reservoir - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/2000
• Title: Annual Report of the Operations Secretary - Concerning the Operation of John Martin Reservoir - 2000
• Water Supply Pro - Doc Type: Annual Report

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during which, the disposition of detained water following the completion of the operation
was discussed, is included in Section 3 of this report.

Also during this period when the reservoir was spilling, diversions of stream flow
to storage upstream of John Martin Reservoir under post-compact water rights occurred
beginning on February 25, 2000. The affect of such diversions was to reduce the inflow
to John Martin Reservoir and the total volume of water that otherwise would have
physically spilled from John 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 John Martin Reservoir that would have occurred but for the
upstream diversions. See the 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 ended.

The spill of Section II accounts was discontinued on March II, 2000 when it was
determined that all waters in excess of the maximum allowable invasion of the flood pool
were evacuated. It is noteworthy that Table IX shows the total amount released from the
flood pool during the spill was 26,030.00 a.f. whereas, records show that upstream post-
compact diversions of stream flow totaled 2790.18 a.f. or 10.7% of the amount spilled.

Throughout the period of spill, the Corps of Engineers determined and controlled
the physical rate of release from the John Martin Reservoir flood pool and the accounting
in this report assigns all evaporation charges to the flood pooL

Transfer of759.88 a.f. was made from a Colorado Section II account to the offset
account on March 31, 2000. This transfer is shown as a release from the X- Y summer
stored water account with a corresponding inflow to the offset account. The purpose for
this transfer was to provide for the annual storage charge and is discussed in a separate
report by the Colorado State Engineer.

During the period of winter storage prior to 2400 hours on March 31, 2000,
conservation storage increased by 71,428.59 a.f. Transfer from conservation storage into
accounts began pursuant to Sections II A and II D of the 1980 Operating Plan at 0000
hour on April I ,2000 at the rate of 1250.00 cfs. As explained in last year's report, all
accruals of inflow to conservation storage on and after April I of each year and prior to
the first exhaustion of conservation storage is assigned to an account entitled "Summer
Compact Water". Conservation storage was first exhausted on May 30, 2000. During
this interval an additional 38,159.65 a.f. was added to conservation storage and a total of
142,109.02 a.f. was transferred from conservation storage into Section II accounts.

In early June, 1235.67 a.f. of fully consumable water acquired by the Lower
Arkansas Water Management Association (LA WMA) from Colorado Springs Utilities
was delivered to the Offset account for the purpose of replacing depletions to usable
stateline flow. Subsequently, additional quantities of water were delivered to the Offset