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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development. The Colorado Supreme Court has upheld the Compact administration of

the Conejos River separatelj from that of the Rio Grande.

Figure 11-2 is a schematic diagram of the Rio Grande basin upstream of El Paso,

Texas and shows the location of gages used in Compact calculations. The amount of

water which the Conejos must deliver to the Rio Grande as measured at its mouths

near La Sauces is based on flows at the following three gages: a) Conejos at Mogote

(full year flow), b) Los Pinos near Ortiz (April-October flow only), c) San Antonio

at Ortiz (April-October flow only). The flows at these three gages are added

together to obtain the "Conej os Index supply" which is used to determine the Conej os

obligation under the Compact in accordance with the table on page B-3 in Appendix

B.

The Rio Grande obligation as measured at Lobatos is based on the flow of the Rio

Grande at the gaging station on the Rio Grande near Del Norte (full year flow).

The table on page B-4 of Appendix B is used to calculate the Compact obligation of

the Rio Grande to deliver water at Lobatos. Since the flow contributed by the

Conejos is included in the Rio Grande flow measured at Lobatos, the Conejos flow

is subtracted from the total flow at Lobatos in calculating the amount of water

delivered by the Rio Grande mainstem.

The Compact obligation of the State of Colorado is the sum of the obligation of

the Conejos River and the obligation of the Rio Grande mainstem less 10,000 acre-

feet. Though the Compact makes no provision for the division of the 10,000 acre-

feet between the Conejos and Rio Grande, Colorado's water administrators typically

prorate the 10,000 acre-feet to the two rivers on the basis of their calculated

Compact obligations.

Compact deliveries are not required to strictly adhere to the tables of delivery

on an annual basis. The Compact allows for deviations from the obligations. A

shortfall in Colorado's delivery (when compared to Compact obligations) will cause

a debit to Colorado's account. Likewise, deliveries in excess of the obligations

cause credits to accrue to the State making the deliveries. The credits and debits

are allowed to accumulate subject to certain conditions discussed below.

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