Sluice about 14 miles below dam. Estimate for construction of all-American canal of capacity to serve the Imperial irrigation district and additional mesa lands with 1,600 second-feet additional capacity for Yuma project down to siphon drop LAGUNA DAM TO SIPHON DROP, CANAL CAPACITY OF 10,600 SECOND-FEET Excavation: Earth, 5,045,000 cubic yards, at 20 cents. Total... 15 per cent contingency._ Structures: Alterations at Laguna Dam___ Turnout reservation canal.. Check below turnout reservation canal. 10, 500 Picacho road bridge. 27,500 Raising siphon drop 34, 000 Walapai lateral turnout_ Check below siphon drop. Paved overflow for receiving storm waters into the canal__ 10 miles of telephone line.. Total__ 20, 000 7, 100 22, 000 20,000 1, 128, 350 15 per cent contingency. 169, 252 Cost of connecting with Laguna Dam (estimated 1,297, 602 1,900,000 Total_-- 5, 008, 794 SIPHON DROP TO ARAZ, 9,000 SECOND-FEET CANAL Earth, 2,600,000 cubic yards, at 20 cents. Earth fill (raising railroad grade), 30,000 cubic yards, at $520,000 30 cents... Raising and ballasting track 1 mile.. 9, 000 Concrete lining 4,400 feet of canal along railroad track 4 inches thick, 950,000 square feet, at 17 cents... 6, 000 Paved overflow for receiving storm waters into the 34, 000 ARAZ TO UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATE, 9,000 SECONDFOOT CANAL Excavation: Earth, 805,000 cubic yards, at 20 cents_ $161, 000 Rock, 145,000 cubic yards, at 75 cents. 108, 750 Concrete lining 400 feet canal, 86,400 square feet, at 17 cents.. 14, 688 UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATES, TO PILOT KNOB, 9,000 SECOND-FOOT CANAL PILOT KNOB TO EAST SIDE MESA CANAL NO. 1 (STATION 1525) 9,000 SECOND FOOT CANAL Earth, 46,736,000 cubic yards, at 30 cents. Total___ 15 per cent contingency. Structures: East mesa canal No. 1 turnout. $14, 020, 800 354, 000 150, 000 234, 000 Drop and check___ 26 miles telephone line. Total 15 per cent contingency.. Total $16, 972, 620 24, 000 52, 000 5, 850 81, 850 12, 277 94, 127 17, 066, 747 3 Structures to be located at place selected for power site or permanent wasteway (see Power develop¡ment, p. 97). Estimate of amount of sand that will blow in during construction. MESA CANAL NO. 1 TO MESA CANAL NO. 2, 6,000 SECOND-FOOT CANAL MESA CANAL NO. 2 TO WEST-SIDE MAIN CANAL, 5,500 TO 1,500 SECOND-FOOT CANAL Excavation: DIVISION OF COST 1. Between the Yuma project for power development Laguna Dam to siphon drop - - Estimate for construction of all-American canal of capacity to serve the Imperial irrigation district with 1,600 second-feet additional capacity for Yuma project down to siphon drop FIRST ALTERNATIVE: PILOT KNOB TO MESA CANAL NO. 1, 9,000 SECOND-FOOT CANAL A first alternative estimate was made to provide a concrete-lined section through the sand hills. The concrete lining is to be 4 inches thick and extend 2 feet above the high-water line. The following are the principal hydraulic functions: SECOND ALTERNATIVE: PILOT KNOB TO MESA CANAL NO. 1, 10,600 SECOND-FOOT CANAL A second alternative estimate was made to provide a concrete-lined section through the sand hills, but with a deeper section than the first alternative estimate, in order to give an additional capacity of 1,600 second-feet. The concrete lining is to be 4 inches thick and extend 2 feet above the high-water line. following are the principal hydraulic functions: The The above alternative estimates include the extra excavation from the west side of the sand hills to station 1575, due to the canal being in deeper cut because of the increased slope of the concrete-lined section. The 6-foot drop at station 1575 will just be eliminated by the greater gradient. This, however, will lower the elevation of the east mesa canal No. 1, 6 feet, and thus eliminate a certain acreage on the east-side mesa that can not be served by gravity. It will also reduce the possible head at mesa power station No. 1 from 30 to 24 feet. Alternative No. 1 decreases the cost, $120,451 over a canal built in an earth section. Alternative No. 2 increases the cost $969,841 over a canal built in an earth section. The estimated cost of the other sections of the canal will remain Estimated amount of sand that will blow in during construction. |