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COUNTY COUNCIL., Ashburton Guardian, Volume III, Issue 526, 5 January 1882
The following is the report presented by the Engineer at the montly meeting of this body yesterday ; Ashburton and Rakaia Plains Water Supply.—The contractors for the E line of ;.: water race at Rakaia are making satisfactory progress with the work, and already the earthwork is completed to the extent of about fifteen miles, or about two-thirds of the entire length authorised by the Council. The amount of absorption in the E channel has not decreased materially during the month, ; s .r audit is only within the last ten days that the flow of water reached the lower end of channel at T. Harrison’s, and that after the capacity of flume over Dry Creek has been increased, and an additional supply let in at upper end, there is still a small surplus available! from Pudding Hill, but whether it will be sufficient to supply the numerous forked channels now in construction below the rail- ; way is, I think, somewhat doubtful, especially as the greatest amount of percolation has hitherto taken place in the district situated . between the railway and the sea. The con- • tractor for the extensions of the D and E lines is making good progress, and since last meet- - ing of Council has got upwards of twenty . miles finished. The works on the Di line are also well forward, fully twelve miles having been completed during the month. The contractor is about to start on the D2 line, and the culverts and other necessary works are so far advanced on the subsidiary lines and extension channels between Ashburton and Rakaia rivers, that there is every prospect of
these being available for service about the beginning of next month. In lieu of the auxiliary service which was proposed from the creeks in Mount Hutt district, and which E latter I reported on at last meeting, I have, as ' requested by the Council, carefully examined . * into the question of a source of a supply from ' the bed of the North Ashburton river, about two miles below the Pudding Hill bridge. I am of opinion that a supply, which might probably prove adequate, could be obtained by filtration from the under current in the river bed, at a point a short distance below the inlet ‘ of Messrs Gould and Cameron’s private water race. Here the water seems to rise to a level of about four feet beneath the general surface, and I calculate that by sinking a channel or channels, in all about twenty chains m length, with a maximum depth of seven feet, that a good flow might be secured. This flew, however, would no doubt be somewhat variable, and the results could only be accurately ascertained after experiment. An expenditure of about L?o or LBO would probably cover the expenses of all the work which would be necessary in the river bed, and if an ample supply were obtained, there would be no - difficulty in leading it over the terrace of the rive- there, which is only a few feet in height. For augmenting the service from Pudding Hill, I would suggest that the race should take the general course marked on the plan,_ so as to effect ■’ a junction with the existing races at Methven. A considerable stretch of fluming would be required over old gullies, but these are unavoidable. The expense would be approximately as follows : —-Works in river bed, say L 80 4 miles main channel, Lioo; fluming gullies, road culverts, etc., L2OO ; total, L 380; say L4OO. This is on the assumption that a free right-of-way for said race will be granted , to the Council as in all other cases, and as the properties through which it would pass would be benefitted thereby, I presume there is no reason tp doubt that the right-of-way would be readily granted. From the same source the
district reicrrei to in me petition uy iwessrs Power, L every, and others, could be supplied by a small race, nine miles in length, on the route indicated by dotted blue line on plan. The expense of the latter should not exceed ‘ ■ '>L>ioo, in the proportion of about L4O for earth work and L6O for fords, etc. lam sorry to have to report that there has been a good deal p _.of tampering with the different races lately, the effect of which has been to give a very unccr- ■ tain apd, intermitting supply. For instance, at Mr Harrison’s on the E line about three miles above Hatfield, the water-race has been ob- • . -StructejiVand,, destnicted by placing bags of ((SfJSekgr fe'ftc'wce. At Mr John Harrison’s, below : like race was diverted and thrown iV. > eir.todhd fieldit. Again at Dollamore’s on the Chertsey race, damage was caused, the race having been p ougfaed in with a double-furrow -i plough, and '1 large proportion of the wafer *4s ;; diverted for private ends. In some instances ItfHwsOfc on Mr llart’s and Mr Holme’s properties, ,'i the parties crimping the land had dammed up for the purpose of forming • j - 'dtinkini places, and temporarily diverting the •lAi its proper course. Another cause failed to provide the on theraces. In conthe question of pollurequires to, be carefully @®S(®^^M^sLs|CB r thete,hcs bpen more than' having been " Supply.—The district are progressof the- lines are yqjwijirtkrn nnot ofcourse be snpiwl Plnfrifiet' are erected over- both HIS river, -The contractors 111 preparations for starts IB .when, f unfortunately, some ID UtKe,. timber they had provided ■I tussock,, fires at the. of the Mount Somers will not delay Bor tlvo, and as _________ _ the! system for the service, ho'
and pushing on the work during the harvest, letween the Ashburton and Rangitata rivers there has been constructed a length of 98 miles of water races, as also most of the culverts and fords and all the concrete tanks over that length. Winslow and Willoughby Water Supply.— As requested by the Council, I have gone over the district between Winslow and Willoughby, and after a careful investigation would suggest the route as laid down on the accompanying plan. The dotted blue line shows the proposed extension of one of the lines from the Westerfield district, but the ground over that district is so porous, that a large quantity of water will have to be let in to charge the races thoroughly, such a quantity indeed as may be liable to damage the races in some places, and instead of throwing still more water into the upper sections of these races, I would beg to suggest for the supply of the proposed extensions below Winslow the forming of a connection with the adjoining creek, as indicated by red line on plan. As this creek gradually increases in volume from this point downwards through the swampy ground, it appears to me that no damage could possibly accrue to any interest by utilising it, and, so ffar as I can leam, all the owners in the district wish it to subserve the public good. Creeks near Tinwald.—l have sub-divided the water between the several creeks as requested by the Council, in the proportion of one third for each, but some of the settlers maintain that one-halt is due to the most southerly creek, and one-fourth only to each of the other two. As I reported before it is difficult to assign the precise proportion due to each, but the lowering of one of the boxes about an inch would give the re-adjustment indicated, and this I believe would still serve the object which the Council wished to be effected.
Wheatstone Drainage.—With reference to the enlargement of creek from Osborne’s road to Fork’s road, requested by the I.ongbeach Road Board, this would no doubt be of considerable advantage to the district if a more capacious bridge, or better still a suitable ford were placed over Ford’s road, on a side about 100 ft north of the present bridge, which is akwardly placed for the passage of flood-water. This improvement would be a short extension of the Council’s drainage scheme further up towards the swamp than they originally contemplated. The expense in all should not exceed L3O, Mount Somers Water Supply.—The first contract of this work is in progress, and two miles fifty-two chains of the main channel has been completed. I have obtained the necessary data for arranging the head-works, flumes, etc., at the proposed source of supply. Wakanui Water Supply.—At a recent meeting of the ratepayers interested in this scheme, a few alterations and extensions wei e proposed by owners. These are shown on the accompanying plans, and if the Council should approve of- them the work could be commenced as soon as the Council may determine. The difference in cost which the altered lines would entail would scarcely be appreciable, and I anticipate that the whole work can still be carried out for the original estimate of L37SI provided the contracts are not let during the month of harvest. The ratepayers are almost unanimous in asking the races in this district to be carried along the lines of roads. There is one phase of the question, especially, which should be fully considered at the present stage, namely, the more minute distribution which some of the owners expect to be effected as soon as the races are finished, by leading water from the mains to almost every paddock, large and small, within the district. The sizes of mains would in a great measure depend on the system (if any) which may ultimately be adopted fur further distributing the supply, inasmuch as in many instances the small branch races would be led in such directions as not to be returnable to the mains. Indeed it would be safe to assume that no part of the supply led out in this way would be returned, _ and the sizes of mains would have to be adjusted accordingly. Some of the owners seemed to be of opinion that they themselves might be allowed to draw off the water from the mains under a system of mutual arrangement with one another, but I should consider it imperative, in the general interests of the scheme, that at least the mains and connections therewith should be immediately under the control of the Council. I may state, however, that the estimate does not include anything beyond the cost of head-works and mains a!ong_ the road sides, without reference to the field distribution referred to. Rangitata Traffic Bridge.—During December the progress at this bridge has not been such as I had anticipated, the detention being partly caused through the occurrence of a fresh in the river, which covered the site of the work for some time, and partly through an accident to the foreman of works, which threw the men idle for a few days. Only two more piers, however, rt quire to be driven now to complete the number as presently proposed. Hinds River Improvement.—The contractors have spared no effort to push this work forward towards completion, and in the course of ten days or so the cuttings will be sufficiently opened up to be available if floods should arise, though the embankments and general finishing of the work will still occupy a few weeks.
COUNTY COUNCIL., Ashburton Guardian, Volume III, Issue 526, 5 January 1882
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