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. . -4- An analysis of such a relationship betw-een transmountan diversion and water supply indicates that at least 19,875 acre feet of water could have been diverted between l.iay 1 and September 30 by the existing t ransmountain :facilities in every year of such a 35 year period with the exception of a year with runoff conditions similar to those occuring in 1934. The actual transmountain diver- sion by the tunnel and the Skyline ditch during that year amounted to 16,351 acre feet for the May-September period. It has been assumed that this amount represents the maximum which the tunnel and ditch were capable of diverting during those months. The analysis also indicated that at least 19,875 acre feet could have been diverted by the tunnel and the Skyline between May 1 and July 31 of any year of the pe~iod except 1934, and possibly 1931. Maximum transmountain diversions, however, have a definite effect on the amount of water available for diversion by the-ditches on the river below the tunnel and above the mouth of McIntyre Creek, which is the first major tributary entering the river below the tunnel. This effect is most direct during months ,\rhen tributary inflow betrreen the tunnel and the Glendevey gage is normally at a minimum. Of these ditches there are three which divert :from the river between the tunnel and the gage. These ditches have irrigated about 235 acres, and have decreed priorities senior to that of the Laramie- Poudre Tunnel, but junior to the Skyline priority. Between the gage on the Laramie River near Glendevey and the mouth of },~cIntyre Creek there are eight di tches which divert :from the river and irrigate a total o:f 1145 acres. Six of these ditches have priorities senior to that of the tunnel, and four are senior in priority to the Skyline ditch.