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8.
Mr. Hull suggested that a length of the upstream
face of the core wall be exposed to ascertain whether it had moved. He also suggested that a small area of pitching on top of the Dam be removed to enable the sand wedge to be inspected. The se matters were arranged for forthwith.
9.
I informed you as above and we discussed the position in your office on 25th September, Mr. Hull being
present.
10.
Various reasons to account for the movement in the Dam were gone into but of course at that time it was not possible to arrive at any definite conclusion. 11.
Mr. Hull stated that he had cabled Mr. Binnie informing him of the situation and on 27th instant you received a cable from Mr. Binnie stating he would arrive in Hong Kong on 26th October.
12.
By 27th September it was proved conclusively that the core wall had distorted, downstream, and that its maximum deflection was 71". At the same time a small crack was observed in one of the construction joints near Parapet Pier No.15. Arrangements were made for further observations
to be taken daily. The sand wedge was found to have settled 1.20 ft. below its original level. 13.
Up to 5th October no further movement of the core wall was recorded, but on 6th October (two days after the threatened typhoon) a further movement of 1" was observed, making a maximum of 8".
14.
On 7th October you visited the Dam with me, Mr. Campbell being present.
15.
It was arranged to sink a trial pit in the earth embankment against the core wall to ascertain the porosity of the embankment, subject to Mr. Hull agreeing, (which he did later in the day).
16.
Mr. Campbell and I both agreed that the "blistering"
11