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'!.: co "- . .-) "'''.01 : ..' ,_, The equipment, me,thod and frequency of measurements at each gaging station shall be suffioient to obtain reoord~ at least equal in acouraoy to those classified as "good" by the U. S. Geologioal Survey. Water stage recorders on the reservoirs specifioally named in Article II of the Com- paot 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 thllwater 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 observations is sufficient in eaoh case to establish any material ohanges in water levels in suoh reservoirs. RESERVOIR CAPACITIES Colorado shall file with the Commission a table of areas and capacities for eaoh reservoir in the Rio Grande Basin above Lobatos constructed after 19371 New Mexico shall file with the Commission a table of areas and capaci- ties for eaoh reservoir in the Rio Grande Basin between Lobatos and San Maroial constructed after 1929; and Texas shall file with the Commission tables of areas and oapaoities for Elephant Butte Reservoir and for all other reservoirs actually available for the storage of water between Ele- phant Butte and the first diversion to lands under the JUo Grande Projeot. Whenever it shall appear that any table of areas and oapaoities is in error by more than five per cent, the Commission shall use its best efforts to have a re-survey made and a oorrected table of areas and capaoities to be substituted as soon as practioable. To the end that the records of flow of the Rio Grande at San Marcial, at San Aoacia, and below Elephant Butte Reservoir may be oorrelated, the Commission shall use its best efforts to have the rate of aooumulation and the plaoe of deposition of silt in Ele- phant Butte Reservoir checked at least every three years. EVAPORATION LOSSES The Commission shall enoourage the equipping, maintenance and operation, in oooperation with the United States Weather Bureau or other appropriate agenoy, of evaporation stations at Elephant Butte Reservoir and at or near each major reservoir in the Rio Grande Basin within Colorado construoted after 1937 and in Nuw Mexico constructed after 1929. The net loss by evapo- ration trom a reservoir surfaoe shall be taken as the differenoe betweon the actual evaporation loss and the evapo-transpiration losses which would have ocourred naturally, prior to the construotion of such reservoir. Changes in evapo-transpiration losses along stream channels below reservoirs may be disregat'ded.