PROJ01966 ‎(2)‎

• Contract/PO #: C153794
• Contractor Name: Colorado Water Protective and Development Association
• Contract Type: Loan
• Water District: 0
• Loan Projects - Doc Type: Feasibility Study

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Rule 6. .criteria for DetennininJ! the Adequacy' of AUlmlentation Water. In
reviewing plans submitted pursuant to these Rules, the state and division engineers shall
determine the adequacy of each source of water proposed for use as augmentation water,
including, where necessazy, the historical consumptive use of each water right. This
detennination shall be based upon acceptable studies of the augmentation source provided
by the well user or plan proponent. Return flows from diversions of waters imported into
the Arlamsas River Basin or other fully consumable waters proposed for use as augmenta-
tion water shall be determined by the state and division engineers based on acceptable
. studies and information provided by the well user or plan proponent. A water right,
other than imported waters or other fully consumable waters, which has not been decreed
for augmentation use may be used as augmentation water in a plan approved by the state
. and division engineers pursuant to these Rules; however, as a condition to approval of a
plan, the state and division engineers may require the well user or plan proponent to file
an application for change of water right and obtain a decree approving the use of the
water right for augmentation use within a reasonable period of time. In no case,
however, shall a water right, other than imported waters or other fully consumable
waters, which has not been decreed for augmentation use be used as a pennanent .source
of augmentation water for more than 10 years in a plan approved by the state and division
engineers pursuant to these Rules.

Rule 7. Conditions for Approval of Plans. Based on stream depletions deter-
mined in accordance with these Rules, the state and division engineers may approve a
plan to divert tributary ground water which provides sufficient augmentation water in
amount, time, and location to replace out~f-priority depletions to senior water rights in
Colorado and any and all depletions to usable Stateline flow caused by such diversions.
Acceptable plans shall be approved annually and shall include such tenns and conditions
as, in the opinion of the state and division engineers, are necessary to prevent injury to
senior surface water rights in Colorado and depletions to usable Stateline flow. Plans
may be amended during the year if approved by the state and division engineers. As a
. condition to approval of a plan, the state and division engineers may require augmentation
water in excess of the amount necessary to replace stream depletions determined in
accordance with Rule 4.2 or Rule 5 to address situations where projected augmentation
water may not be available, such as a dry year.

Rule 8. Detennination of the Timine and Location of Stream Depletions: Unit
Response Functions. To determine the timing and location of stream depletions caused
by diversions of tributary ground water, the state and division engineers shall develop
unit response functions for wells diverting from the Valley Fill Aquifer and surficial
aquifers along the Arlamsas River between Pueblo and the Stateline. These unit response
functions may be used to determine the timing and location of return flows from diver-
sions of imported waters and other fully consumable waters. To detennine the timing
and location of stream depletions caused by other diversions of tributary ground water,
water users may use apJlropriate ground water models or other methods acceptable to the
state and division engineers to calculate the timing and location of stream depletions

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