LPPD000265

• Contract/PO #: C153756
• 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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Curtailment is defined as the percent reduction a group's water allocation compared to
what that group is allocated in a normal year. Normal year allocation is equivalent to
past normal year pumping and is based on historical water demand use patterns.
Curtailment is expressed as a percentage reduction and is calculated as:

(past normal year pumping) - (allowed pumping this year)
(past normal year pumping)

x

100

If in a dry year supplemental users are only allowed to pmnp 58,500 af, these users have
a demand shortfall of 17%. Relative to a normal year allocation of 49,966 af, however,
they were not curtailed. In this situation, the curtaihnent measure is equal to -17%~ that
IS,

[(49,966- 58,500)/49,966] x 100 = -17%.

Here, the negative sign means that supplemental users are allowed to pmnp 17% more
water as compared to nonnal year allocations. In this example, even though
supplemental users are allocated additional water (as compared to a normal year) they
still have a demand shortfall because their water needs have increased by more.

As way of another example, if in a different dry year supplemental users are only allowed
to pmnp 42,000 af, curtailment would equalI5.94%~ that is,

[(49,966- 42,000)/49,966] x 100 = 15.94%.

Curtailment in this situation denotes that, as compared to normal conditions, they are
allocated 15.94% less water. Demand shortfall in this situation, however, is 43.96%

As is the case with demand shortfall, curtailment can either be calculated using pumping
demand or replacement demand.

Bill Impact

Each allocation method is described in terms of its impacts on individual user groups'
LA WMA water bills. Bill impacts are reported as: total bills, dollars per share (if
evaluating the shares organization), dollars per well and dollars per af of water pumped.

LAWMA Revenue Stability

From LA WMA's perspective a desirable allocation method is one which generates a
stable stream of revenues. Allocation methods which generate large fluctuations in
arumal LA WMA revenues make it difficult for LA WMA to pay its bills (in years when
revenues are extremely low) and are difficult for LA WMA to justify to its members (in
years when revenues are extremely high).

EnWater Resource Consultants September 5, 1997 Final Report

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