Arizona republican., 1913-06-20

for d couple of miles along the na tural saddle which connects the Hole in-the-Rocll buttes with the Camel back mountain. It is this extremely iconvenient saddle that makes the whole power system possible of con- ! structiOn. Entering the hills the ditch tears it's way around convenient con tour lines until it comes to depres- sion, which it could not avoid Not even a tunnel, built at ruinous ex- pense could have passed this gully. ] for it was just a blank space in the map and had to be treated as such. A fill here was Impossible so the engineers built a beautiful fIue just about five hundred feet long, trestIed on sturdy concrete legs and crawling across the ravine in the very shadow i of the mob that conccals-or rather reveaIs-Hole-in-t the-R Rock A bit of a rock cut at the lower end lets the canal through to the south shoulder f of the butte and here nestIes that miniature oblong lake to be. the fore bay, which is shown in two views on l this page.
 Fore bay is readily understood
 term It means in this case a wide place at the end of the canal three hundred feet long where the flood will lose it's turbulence and become calm and steady before it is lead through the trash racks and sand l traps through the butterfly gates and [ into the big tubes. The eastern side or the fore bay is composed of a line of concrete walls separated by narrow slit gates for clearing the water out
 The handy ravine that commences below the face of the spilway will 1 in times of stress on the system flow
 deep in waste water. The lower end of the bay merges into the cleansing i system Imagine cleaning water. But it has to be done. A wall is reared across the path of the power laden flood pierced with holes where i will fit racks of steel rods to catch weeds. sticks boards and any other flight floating material that must not get into the turbines A few feet further on and lower are the sand traps square holes in the cement floor where the heavy impurities will settle The bottom of each hole is a ivalve that can be raised from above to permit the force of the water to whrl the accumulated sand away through the floor into the small con
 crete lined waste ditch that joins the bigger one from the spillWay q fewer
 rods down the ravine.
 One of the photos shows the lower extremity of the fore bay. Here
 the two big pipes will be connected
 with the openings in the valves. The flow of water will be controlled here
 bv a pair of "butterfly gates' large circular slabs of steel and concrete 1 swinging on a vertical axis within
 the openings.
 The head of water here begins to l gather that momentum that makes
 tho power lower down. Tn the tWen-
 tv-tiree hundred feet the pipes eN- tend southwestward. they drop 1S0 feet. the concentrated drop of the
 Arizona and CrosscUt canals all in
 one piece. At the present time the pipes are built complete to within 1 five hundred feet of the forebay. The operation is like all reinforced con 1 crete building A gang of steel men keen ahead beinding seven foot hoops of half inch steel wire to large
 twisted rods of the same material
 and forming a skeleton pair of pipes. This work has progressed to about 25O feet ahead of the concrete gangs. 1 Next come the carpenters. building inside and out of the skeleton tubes the facings that will mold the ce- rnent. A mechanical mixer near the line of the pipes is busy many hours
 a day grinding out the best of ce- ment mixtures which gangs of men 1 carry in wheelbarrows to pour into ] the forms. Further down the car | penters follow stripping the boards 1 from the pipe that has already set and taking it out from the inside, ! Below them is man whose sole duty is to play hose over the ugly
 rough backs of the immense worms
 to keeps the concrete moist and mako ft set without cracking or weakening ! ing. From today the contractors i Martin and Gillas will have the hose 1 going night and day for the heat Of 1 the last few days is terrific up on that bare hillside and the cement, ] though it showed not so much as line under Farishs and his assis
 tant's rigid inspection. may not set
 right if it is allowed to dry too ra
 ridly.
 A couple of peculiar things were 1 observed about these two giant tubes. i One is that conversation in one end.
 hammer blows and other industry 1 sounds are clearly if fdintlY audible