928 REPORT— 1888. 



the root or commencement of the groyne, which it threatened to isolate, and which 

 has been hastily continued landwards by a temporary stone wall to check this 

 disposition the sea displayed to get behind the groyne, which, from its position and 

 height (9 feet above H. VV. springs), causes an increased action of the sea to leeward, 

 and consequent recession of the high-water line to be met by other works of defence 

 eastward. 



It will be seen by the plan that it is only the western portion of the East Cliff 

 property that is immediatel}^ affected by the recent encroachment of the sea, the 

 triangular 'full' of shingle held in position by the Castle jetty forming a sea barrier 

 to the terrace from Arlington House eastward ; should, however, the recession of the 

 shore in front of Guilford battery continue, no steps being taken to arrest the sea, 

 the apex of this triangular accumulation of shingle abutting on Castle jetty will 

 retreat landward and eastward, the inclined line of high water becoming more and 

 more acute, and the frontage defended by the shingle would necessarily become 

 more limited in extent. The stability of this shingle mole depends entirely on the 

 state of repair of the Castle jetty ; and when it is considered that the beach is more 

 than 20 feet higher on one side than on the other, it will be seen that it is a vital 

 question in the inquiry. 



The small amount of shingle that lies under the lee of Castle jetty to the eastward 

 was during my inspection — 



At the high-water ' full' in a line with the East 



Cliff houses, from the platform, of the jetty 

 In line of garden walls of ditto 

 Line of esplanade railing .... 

 End of doubled part of jetty . 



At next offset in ditto 



End of main jetty ...... 



From top of lower jetty or groyne at junction 



with main jetty ...... 



The crest of the shingle mole on the western 



side being 



Or a total difference of level of the beach on 



the two sides of the jetty of . . .29 ft. 



Whatever works of defence may be constructed in front of the War Department 

 frontage to render permanent the sea margin there will have the effect of protecting 

 the property eastward by holding in position the eastern shingle mole ; but this 

 ultimately must depend entirely on the Castle jetty for its continued stability ; with, 

 however, a natural sea barrier 10 feet above high water, any shore work of defence 

 along the immediate frontage of East Cliff Terrace would be one of supererogation.' 



Having regard to the above, and considering the entire frontage of 1,100 feet 

 between the new harbour groyne and the Castle jetty, it is impossible to disconnect 

 the condition of the Castle jetty from the inquiry, nor would a parallel shore work 

 of defence be applicable to the entire frontage ; and having regard to the uncertainty 

 attached to the ultimate enclosure of the bay and the extent to which the Admiralty 

 pier may be projected, and looking to the success of the timber revetment in front 

 of the Ordnance property and the prevaihng opinion in favour of such a work, I am 

 disposed to recommend the construction of an oak timber revetment or wharf from 

 the new harbour groyne to Arlington House 600 feet in length, to be carried down 

 to the chalk substratum according to Section No. 1 for the western end of 200 feet, 

 the necessity for which will be apparent when the action of the sea eastward of the 

 Castle jetty is studied ; the eastern portion, from its being mainly behind the 

 shingle, may gradually diminish in depth, of which Section No. 2 is an average 

 section. 



In connection with the above, a complete doubling of the Castle jetty is necessary 

 on its outer or eastern side, from the first offset or end of the portion formerly- 

 doubled at the north end, down to the end of the lofty portion of the jetty, 120 feet 

 in length. The low-water groyne, 165 feet long, requires similar treatment on the 

 east side for its entire length, and on the west side for half its length. In addition 

 to this outer doubling, a large proportion of the wales, braces, and ties require re- 

 newal, and the stone hearting to be redisposed where settled or fallen out, and the 



' [When the works for enclosing Dover Bay are carried out this state of things 

 will cease. They were problematical in 1863.] 



