Prior to the construction of the Ringarooma and Maurice Water Races, the company owned the rights as follows. The main race generally follows the line of the Ringarooma River, interrupting, however, a major bend at Branxholme. Also observed Hoskins, in the flow of water in 6-foot spiked steel pipes in the Pioneer Power Company waterworks, Utah, USA.
In four years, this could bring the Krushka siphon runoff about 7 percent, the Dorset about 5 percent, the Black Creek about 5 percent, and the Valley about 1 percent. In the case of the Krushka and Dorset siphons, since most of the pipes were covered, there was no nuisance to fear. Fraser instead of the detours that would otherwise be necessary to turn the heads of these depressions.
A great deviation towards the east would be necessary, of such a character as to considerably increase the cost of the work. The double-walled building was built only through short gorges and does not form an important part of the work. Except where the soil is of an ana ele contained character, it would be advisable in works of this kind: the outer wall of dressing to hard rock, to remove the soil of the natural surface within the wall and fill interior space at the intersection. of walls and rocks with well rammed selected material, but these precautions must be left entirely to the officer in charge.
In some sections of the line it was impractical to use any other construction than flowing. The dam (see illustrations Nos. 12 and 13) is located north of the junction of the Ringarooma River with Federal Creek. The dam rests on river shingle and sand, and the bank of the river is granite, the material on the steep bank is very decomposed.
The dam was used simply to push the water up the race, and to form a tailings pond for depositing at least a portion of the tailings from mining operations upstream. The steep slope of the land on the left bank was against the construction of an extensive by-wash on that side. The heavy material excavated can be used on the toes of the slope of the dam.
It was also taken into account that covering the bed would significantly reduce the leakage over time. Fraser informs me that the material used in the construction of the dam was the decomposed granite into which trial holes were sunk on the steep left bank of the Ringarooma River. Very good clay for the pond ditch was found within 30 feet of the inner toe of the dam.
A tree fell on a narrow bank, and thus gave the water an outlet, washing away about 30 feet of the race.
As there are tin mines in operation upstream, which send down considerable quantities of tailings, it was necessary to provide a settling tank, and as there was no suitable place on which to build a wooden tank, I decided to make the spillway act as a settling tank, by having a sluice in the middle to discharge tailings when necessary and a screw inlet gate to draw the water off at the top. The pond is composed of granite stones weighing half a ton each, the upstream side being of 1 to 1 batter, and the downstream side the same batter, but divided into steps 3 feet wide and 3 feet deep, as shown. The overflow is made waterproof by sand and silt that comes down from the tin works.
They will be of the pattern shown in the mining regulations and will be in boxes of 10 sluice heads each. At Ringarooma Dam there will be 10 of these placed side by side, and in addition 4 other boxes to carry 4, 3, 2 and 1 lock heads respectively.
One of the features that struck him was the large proportion of wood used in the flush work, etc. He would like to know if any special provisions have been made, such as the use of copper nails and fasteners. Champion's paper was built through thick scrub and immense forests, making the position of the designer a particularly anxious one.
The mine owners are to be congratulated on having such a free supply of water. And in these cases, three of the eruptions occurred where layers of basaltic rock were struck beneath the surface. Turner said that some of the slopes on the side of the rough ditches appeared to be extremely steep; in the usual place he didn't think they would stay long.
The manager of the Blue Spur mine in New Zealand told him a very unique thing. He asked the manager what they meant by a small pipe just above the water level, and he was assured that it greatly increased the efficiency of the lift. It was used in every elevator, and the manager assured him ('Mr. Higgins) that the efficiency was greatly increased.
He (Mr. Higgins) thought that if the efficiency really increased, they could deduce the fact that the vacuum actually gained at the pump was greater than actually required. Alexander Wilson would lend him (Mr. Higgins) his notes on experiments on centrifugal pumps, and he would ask his permission to bring them before the institute, for the institute has from time to time dealt with the matter, and would it was worth having his experiments as well. Champion's paper overall, he thought, was one of the most detailed he had read at the institute.
Though all the diagrams were very interesting, it seemed to him that the weirs, which have stood so well, and which were so simple and cheap, were perhaps the most interesting of the illustrations that Mr. would do in the same way. would like to know the size of the stones that the water fell on in Sketch R; was it all a stone I. Great difficulties had been encountered in controlling the spill due to the porosity of the soil.
The siphons have effected a great reduction in fluming, but the use of the latter had been unavoidable in parts of the work, as the illustrations suggest. He had been unable to secure any details of the nozzle used for sluicing for submission to the Institute.
