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.~ first to melt and the flow from this source then exceed. the flow from the mountains. As the season adva.nces the higher snows melt and produce the annual rise, during the month of May, which is followed by a sudden recession and low river flow during the remainder of the summer, except for "flash flows" from heavy rqins. No storage works h<J,ve been provided iu either State. There are several available sites in Colorado and reservoir construction should precede further agricultural development in Colorado. The winter and flood flows will be available for storage. Reservoir development will result in expansion of the irrigated area and will increase the flow of refurn and seepage waters entering the stream between Hesperus and the Interstate Line. " By the compact, the winter flow (December 1st to Febrnary 15th) and all of the flood flow in excess of 100 cubic feet pel' sec- ond, may be. used or stored in Colorado. During the early spring the flow at the Interstate Line, resulting from the melting .of snows on the lower mesas, is greater than the flow from the moun~ tains above Hesperus, and hence nO administration will be re- quired to comply with the compact during this early flow. After the flood season the flow at the Interstate Line, on any da!', shall he a quantity equivalent to one-l1alf the mean flow at the IIiesperus Station for the preceding day (but in no event to exceed 100 cubic feet). 'l'his enables Colorado to receive full credit for all seepage, waste, and other waters entering the stream be- tween Hesperus and the Interstate Line and permits diversion in Colorado of an additional amount equal to the total flow from such return, seepage, and' other sources. As such waters increase the burden upon the mountain flow will decrease correspondingly. When the inflows below Hesperus equal 100 cubie feet or one-half the mountain flow on any day when less than 100 cubic feet is to be delivered, no further delivery of mountain waters will be n'. qui red. Colorado gets full credit for all "flash flows" (from heavy raius) entering the stream between Hesperus and the Interstate Line. These flash flows may be stored, diverted by ditches, 0.1' otherwise utilized in Colorado and Colorado will get credit for parts thereof which. flow across the Interstate Line. ' The State Engineers are authori7.ed to rotate the whole flow between the areas in the.two States whenever the river is so low that diversion of the water would cause unnecessary waste. This method may never he availed of and, if tried, may he terminated at any time if it proves unsatisfactory. Neither State is obliged .to continue its use. If successful, it may be put into .operation whenever conditions require. . Qolorado is not required to deliver any water to New Mexico which is not then needed for beneficial use. Jf, by reason of heavy [ 5 ]