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ON THE DOVER HARBOUR WORKS, 483 
East Pier. The contract for its construction was let to Sir John Jackson 
in 1892, and the memorial stone was laid by his Royal Highness the 
Prince of Wales on July 20, 1893. 
Towards the end of 1895 the Admiralty instructed the authors to 
prepare a design for an enclosed harbour suitable for the accommodation 
of Her Majesty’s navy. For this purpose it was necessary that a detailed 
engineering survey should be made, including many thousand soundings 
extending about 1} miles from the shore, borings to ascertain the character 
of the foundation on the lines of the several proposed works, and observa- 
tions on the direction and strength of the tidal currents at various periods. 
The works, which, as the result of the survey, were recommended 
(see Plate), are : 
(a) An extension of the Admiralty Pier in an E.S.E. direction for a 
length of 2,000 feet, practically doubling its present length. 
(6) An east arm commencing against the chalk cliffs a few hundred 
feet east of the eastern boundary wall of the convict prison enclosure. 
The direction of this work will be approximately 8. by W., and its length 
3,320 feet. 
(c) An isolated breakwater, 4,200 feet long, forming the southern 
protecting arm and running generally W. by 8. and E. by N., but turning 
towards the north at its eastern end. The average depth, at low water, of 
ordinary spring tides on the line of this Southern Breakwater is 42 feet. 
(d) The reclamation of 21 acres of the foreshore to the eastward of the 
Castle Jetty. This reclamation is now being formed by the construction 
of a substantial sea-wall, founded on the chalk, a little above the level of 
low water of ordinary spring tides. The length of the retaining wall from 
the Castle Jetty to its junction with the east arm will be 3,850 feet, of 
which length the foundations are now laid and the wall brought up to 
varying levels for 2,000 feet. 
Between the seaward end of the East Arm and the eastern end of the 
South Breakwater there will be left an entrance 600 feet in width, with a 
navigable low-water depth of seven fathoms. A second entrance will be 
formed by the head of the Admiralty Pier extension and the western end 
of the Southern Breakwater. This will be 800 feet wide, and it will also 
have a depth of about seven fathoms. 
It will be observed that the western head of this last-named entrance 
will be between 400 and 500 feet to the south of the eastern head. This 
arrangement was decided on in order to assist vessels entering the harbour 
at times when the east-going current is running at its greatest velocity of 
nearly four knots per hour. The overlap will also facilitate the entrance 
or exit of vessels during south-westerly gales. 
The total length of sheltering works to be constructed is 9,520 feet, 
and the area enclosed, exclusive of the Commercial Harbour, will be 
610 acres at low water, 322 acres being outside the five-fathoms line, and 
171 acres outside the six-fathoms line. 
Comparing these figures with the proposals of the Commission of 1844, 
and allowing for the existing Admiralty Pier, which was not commenced 
until 1847, it is found that by the addition of only 700 feet of sheltering 
works, the following gain of area will be obtained :— 
At low water , - 7 « - . + 30 acres, 
At five fathoms ; zs a 4 rs . 52 acres. 
At six fathoms ¥ Pi ¢ , E a » 59 acres, 
Ir2 
