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: ': :~;.';;,).-:_-. . B- 3 t- en <i" ~ from northwest of Monte Vista to east of Alamosa. It is the approximate Q (.~ southern boundary of the Closed Basin as shown on Plate 1, Colorado Water Resources Circular 18, U.S. Geological Survey. Its location is subject to change as more information becomes available. This ridge prevents the natural movement of unconfined ground water from the Closed Basin into the Rio Grande mainstem and instead causes such ground water to move toward the sump area of the Closed Basin. F. The term "confined aquifer" means that aquifer deriving its prin- cipal recharge from peripheral inflow to the Rio Grande Basin in Colorado. The confined aquifer is separated from the unconfined aquifers of the Rio Grande Basin by an aquiclude generally referred to as the blue-clay layer. The approximate limits of the blue-clay layer is as shown on Plate 2, Colorado Water Resources Circular 18, U. S. Geological Survey. These limits are subject to change as more information becomes available. G. The term "tributary water". means any water occurring either on the surface or underground which influences the rate or direction of movement of water in a stream system. H. The term "percentage curtailment" means that percentage of the flow at the upper index stations; i.e., Rio Grande near Del Norte, Conejos River near Mogote, Los Pinos River near Ortiz and San Antonio River at. Ortiz, determined by the state engineer to be necessary to meet Compact commitments as measured at gaging stations located on the Rio Grande near Lobatos and on the Conejos River . at its mouths near Los Sauces. II. Surface Water Administration A. Administration of all surface water tributary to the Rio Grande or the Conejos River will be based on the fact that the delivery of certain quantities of water pursuant to the Compact constitutes the most senior water commitment