TAWA FLAT TUNNEL
WATER HINDERS WORK NEW SHAFT SUNK Press Association WELLINGTON, Today. In connection with the driving of the big Tawa Flat tunnel, a shaft was sunk and (headings begun from this end. In addition to the headings at the two exits, the northern drive of these two extra headings has so far proved fairly good ground, but going south the hill has been so shaken up by earthquakes of times past that timbering has been necessary right up the face. To add to the difficulties a subterranean lake or reservoir was on Tuesday night delivering a flow of 20,000 gallons an hour. Three Cameron pumps have proved unable to keep the water down and on Wednesday afternoon the water had completely filled the heading. The pumps are working away chains under water, hut it is only a question of time when the foot of the shaft will be flooded. The grade is one in 124 and the whole position is made very difficult. Underground streams of large dimensions are-rare in this kind of work, but reservoirs are much less so. It is considered that this is a reservoir and if the present pumps fail to get the water down extra pumps will be put on.
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https://paperspast.natlib.govt.nz/newspapers/SUNAK19290830.2.53
Bibliographic details
Sun (Auckland), Volume III, Issue 755, 30 August 1929, Page 6
Word Count
207TAWA FLAT TUNNEL Sun (Auckland), Volume III, Issue 755, 30 August 1929, Page 6
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