PUBLIC LAW 88-198-DEC. 12, 1963
356
[77 STAT.
(c) During the Storage Season, no water shall be diverted under direct flow rights unless there is water in excess of the demand of all operating resen^oirs for water from Costilla Creek for storage. (d) I n order to assure the most efficient utilization of the available water supply, the filling of Eastdale Reservoir No. 1 from Costilla Creek shall be commenced as early in the spring as possible and shall be completed as soon thereafter as possible. The Cerro Canal or any other ditch which may be provided for that purpose shall be used, insofar as practicable, to convey the water from the Canyon Mouth to Eastdale Reservoir No. 1. During any season when the Commission determines that there will be no Surplus Water, any diversions, waste or spill from any canal or canals supplying Eastdale Reservoir No. 1 will be charged to the quantity of water diverted for delivery to said reservoir. (e) The Commission shall estimate each year the Safe Yield of Costilla Reservoir System and its component parts as far in advance of the Irrigation Season as possible, and shall review and revise such estimates from time to time as may be necessary. I n the event the Usable Capacity of the Costilla Reservoir changes, the average safe yield and the equitable division thereof between the States shall be determined in accordance with the following table: Division of Safe Yield Usable Capacity of Costilla Reservoir
Average Annual Safe Yield (acre-feet)
Colorado
New Mexico
(acre-feet)
(per cent)
(acre-feet)
(per cent)
(1)
(2)
(3)
(4)
(6)
(6)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 16,000 15,700
1,800 3,400 4,900 6,400 7,900 9,300 10,700 12,000 13,200 14,300 15,200 16,000 16,600 17,000 17,400 17,700 17,900
1,510 2,000 2,450 2,910 3,370 3,800 4,220 4,620 4,990 5,320 5.600 6,840 6,020 6,140 6,270 6,360 6,420
83.9 68.8 50.0 45.6 42.7 40.9 39.4 38.6 37.8 37.2 36.8 36.5 36.3 36.1 36.0 35.9 35.9
290 1,400 2,450 3,490 4,530 5,500 6,480 7,380 8,210 8,980 9,600 10,160 10,580 10,860 11,130 11,340 11,480
16.1 41.2 60.0 54.6 67.3 59.1 60.6 61.5 62.2 62,8 63.2 63. 5 63.7 63.9 64.0 64.1 64.1
Intermediate quantities shall be computed by proportionate parts.
I n the event of change in the Usable Capacity of the Costilla Reservoir, the Costilla Reservoir complement of the Costilla Reservoir System Safe Yield shall be divided between Colorado and New Mexico in accordance with the percentages given in Columns 4 and 6, respectively, of the above table. Each State may draw from the Reservoir in accordance with the allocations made herein, up to its proportion of the Costilla Reservoir complement of the Costilla Reservoir System Safe Yield and its proportion of Temporary Storage and no more. Colorado may call for the delivery of its share thereof at any of the specified Points of Interstate Delivery. Deliveries of water from Costilla Reservoir to the Canyon Mouth shall be adjusted for transmission losses, if any, between the two points. Deliveries to Colorado at the Boundary shall be further adjusted for transmission losses from the Canyon Mouth to the respective Points of Interstate Delivery.
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