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Flatiron Pumping Plant and Carter Lake Pressure Tunnel will transfer. water from Flatiron Reservoir to Carter Lake Reservoiro They will also operate in reverse on such waters as are rele~sed back through these features for delivery via the Horsetooth Feeder Canal 0 The proposed pumping plant, to be located at the Flatiron . ' Power Plant, Wlll have a rated capacity of approximately 112,000 gallons per minute for a maximum pumping lift of nearly 300 feeto It will deliver the water via a pressure tunnel, 8 feet in diame~er and 101 miles long, which will extend south and upward from the pumping plant discharge conduit to the bottom of Carter Lake Reservoiro Construction of the tunnel, including a concrete trash- rack structure in the reservoir and a valve chamber with an access shaft near the north shore of the reservoir, will require approxi- mately 32,000 cubic yards of excavation and 7,500 cubic yards of con crete 0 Carter Lake Reservoir will occupy a natural basin located about 8 miles west of Berthoudo Three dams, now under construction, will enlarge the existing basin and provide about 114,000 acre-feet of storage capacity covering an area of 1,174 acres at elevation 57630 This reservoir will store a portion of the imported waters which subsequently will be released southward to the Sto Vrain Supply Canal or returned to the Flatiron Reservoir for use in the Big Thompson or Poudre Valleyso Carter Lake Damso--Dam Noo I, now under construction at the natur81 outlet from the basin, will be an earth and rockfill type structure with a maximum height of 200 feet and a crest.length of 1,235 feeto Dams Noso 2 and 3, of similar.construction, will be located at.low saddles. in the hogback ridge north of the main damo The smaller structures will be 75 and 55 feet in height above foun- dation and have. crest lengths of 1,150 and 1,425 feet, respectivelyo Construction of the dams will require nearly 4 million cubic yards of excavation and the three dams will contain nearly 3 million cubic yards of selected earth and rockfill materialo A gate- controlled outlet tunnel at Dam Noo 1 will deliver water from Carter Lake Reservoir to the sto Vrain Supply Canalo Sto Vrain Supply Canal will lead from Carter Lake Reservoir at Dam Noo 1 and extend south 9.7 miles to sto Vrain Creek near Lyons 0 Enroute, it will cross the Little Thompson River which will also receive supplemental water from the reservoiro Horsetooth Feeder Canal begins at the Flatiron Reservoir and. extends north 13 miles to Horsetooth Reservoiro Enroute, it crosses the. Big Thompson Canyon and will deliver water to the Big .Thompson Rivero In addition to ~ater received from the Flatiron Reservoir, this canal will also receive water from the Big Thompson River via the appurtenant Horsetooth Suppiy Conduit which leads from an intake structure on the river and extends east about one mile through the canyon wall to join the canal on the south side of the river. Pending completion of the Estes Park-Foothills Power System, the 22