PROJ00495

• Contract/PO #: C153678
• Contractor Name: Lower Arkansas Water Management Association
• Contract Type: Loan
• Water District: 67
• County: Prowers
• Bill Number: SB 96-124
• Loan Projects - Doc Type: Feasibility Study

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delivery in the upcoming year. The second quantification will be made with respect to usable
Stateline flow. It will use the results from appropriate runs of the Kansas H-I Model reflecting
only main stem irrigation pumping to calculate the increases in usable Stateline flow from the
replacements made to Colorado surface rights. Again, the necessary amounts of replacement
water will be determined and set aside for release or delivery in the upcoming year. When
LAWMA's sources of replacement water are not sufficient, then arrangements will be made
for the purchase of additional water from Pueblo, Colorado Springs, or from users in Water
District 67 (from the transit loss account residual).

The replacement of depletions based on five-year average pumping should be
acceptable for LAWMA because a large part of its depletions affect only State line flow. The
Special Master found that the Kansas H-l Model was reasonable for calculating depletions to
State line flow, but only on the basis of a long-term average. This consultant believes that
replacements figured on a five-year average should be acceptable to the Water District 67
ditches since most surface water users also own wells. The possible exception is surface
water users under the Amity, but LAWMA's depletions to the Amity are relatively small, and
at least some of LAWMA's depletions to the Amity will be replaced with storage account
water. It is understood that surface right owners upstream from John Martin Dam want
replacements made on a "real time" basis. These surface right owners are affected little, if
any, by LAWMA's pumping. Accounting based on a five-year average has significant
advantages to LAWMA and its members. Replacement requirements will be known in
advance so LAWMA members will know in advance what their pumping bills will be. In
addition, LAWMA will know in advance if it needs to purchase additional water.

Table 14 is an accounting for Colorado surface rights based on the average pumping
during water years 1990-94. Only certain "non-discretionary" water sources are included in
this table. Non-discretionary in this context indicates that LAWMA will not have control over
the time when or location where the replacement water is made available. LAWMA's
"discretionary" sources include its Article II Account water and any purchases of consumable
water that it may be required to make in the future. The only non-discretionary sources not
included in the table are the direct flow components of the Stubbs and X- Y water rights since
they can be used only to replace depletions at the Stateline. The well depletions and the
replacement water balance in the river segment above the Keesee headgate. Significant
shortages in replacement water occur in the Wiley, Pleasant Valley, and May Valley drains

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