PROJ00518

• Contract/PO #: C153484
• Contractor Name: San Luis Valley Water Conservation District
• Contract Type: Grant
• Water District: 0
• County: Rio Grande
• Bill Number: FSG
• Loan Projects - Doc Type: Feasibility Study

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providing each water right with its decreed amount until all water has been
allocated.

4.

Periodically (currently every 10 days) during the diversion season, the

Division Engineer reviews how well the Compact obligation is being met and

may revise the curtailment percentage used by the water commissioner.

For an example of the process, consider the following information for August 8,
1979.

Division Engineer's current estimate of curtailment percentage is 55 percent.

Del Norte total daily flow volume is 983.0 second foot days (one cubic foot

per second (cfs) times one day).

Reservoir releases and transmountain diversions contained in the Del Norte

gage total 137.8 second foot days.

With this information the water commissioner calculated that 845.2 second foot days

(983.0 - 137.8) was available for allocation before consideration of the Compact

and 380.3 second foot days (845.2 - (845.2 x .55)) are available for allocation to

Colorado water users after consideration of the Compact. The water commissioner

then proceeded down the list of water rights allocating water to those wanting

water. His record for this day indicates that the last priority served was the 20

cfs decree of the Rio Grande Canal (District Priority No. 197).

Another factor which influences the determination of Del Norte flows required to

satisfy the Compact is the importation of water to the Rio Grande by the Closed

Basin Project. Closed Basin imports to the Rio Grande mainstem will mean that more

of the mainstem and Conejos flows will be available for allocation to Colorado water

users. Further discussion of the Closed Basin Project and its consideration in this

study may be found in Section V.

The Compact disclaims effect on Indian water rights. For purposes of this study

it has been assumed that Indian rights, Federal appropriative and reserved rights,

or other presently unadjudicated rights will not affect the Colorado Compact

schedules or obligations.

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