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194
HARBOUR ENGINEERING.
There must also be taken into considération the faet that the continuity of
the pavement had been broken by trenches cut to receive the anchorage bars
of the head. Moreover, there had probably been some settlement in the rubble
work which it covered. All these causes combined to render it an easy prey
to the storm, which swept away the floor and battered down the piling, with
the aid of the loose masses of stone comprising the hearting.
With the front portion of the pierhead reduced to a mere mass of débris
South Pierhead at Pillau.
Condition oF Outlying Blocks in September 1896.
Sca/e:^
Fig. 163.—Pillau Pierhead—Protection Blocks.
sloping downwards to the sea bottom, it became necessary to devise measures
for the protection of the superstructure. Any renewal of the destroyed
portion was out of the question, owing to the impossibility of driving piles
through the rubble mound. The plan decided upon was to mould and con-
solidate the mounds into a protective apron.
The ftrst step taken was to deposit a quantity of massive granite blocks
on the site of the terrace. The level at this point was 3 feet above mean
low water, and it was annually increased. Up to the year 1891, over