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C!:J LI? C\J ~ -C") RIO GRANDE COMPACT COMMISSION REPORT 20 ---. The equipment, method and frequency of measurements at each gaging station shall be sufficient to obtain records at least equal in accuracy to those classified as "good" by the U.S. Geological Survey. Water-stage recorders on the reservoirs specifically named in Article II of the Compact shall have sufficient range below maximum reservoir level to record major fluctuations in storage. Staff gages may be used to determine fluctuations below the range of the water-stage recorders on these and other large reservoirs, and staff gages may be used upon approval of the Commission in lieu of water~stage recorders on small reservoirs, provided that the frequency of observation is sufficient in each case to establish any material changes in water levels in such reservoirs. RESERVOIR CAPACITIES L1- Colorado shall file with the Commission a table of areas and capacities for each reservoir in the Rio Grande Basin above Lobatos constructed after 1937; New Mexico shall file with the Commission a table of areas and capac- ities for each reservoir in the Rio Grande Basin between Lobatos and San Marcial constructed after 1929; and Texas shall file with the Commission tables of areas and capaci- ties for Elephant Butte Reservoir and for all other reser- voirs actually available for the storage of water between Elephant Butte and the first diversion to lands under the Rio Grande Project. Whenever it shall appear that any table of areas and capacities is in error by more than five per cent, the Commission shall use its best efforts to have are-survey made and a corrected table of areas and capacities to be substituted as soon as practicable. To the end that the Elephant Butte effective supply may be computed accurately, the Commission shall use its best efforts to have the rate of accumulation and the place of deposition of silt in Elephant Butte Reservoir checked at least every three years. ACTUAL SPILL G. (al Water releases from Elephant Butte in excess of Project requirements, which is currently passed through Caballo Reservoir, prior to the time of spill, shall be deemed to have been Usable Water released in anticipation of spill, or Credit Water if such release shall have been authorized. 1 Amended at Eleventh Annual Meeting, February 23, 1950. 2 Adopted at Fourth Annual Meeting, February 24, 1943.