100
Question.
PORTS AND HARBOURS OF THE BRITISH EMPIRE:
Glasgow.
Liverpool.
London.
UNITED KINGDOM.
Southampton.
3
565
(1) the minimum width ? (2) the
minimum navigable depth. L.W.O.S.T.?
the Queen's Channel at the entrance to the River Mersey, the width is 500 yds, and the depth 32 ft. (L.W.O.S.T.).
1. At bar or entrance, what The navigable width of the channel In the dredged cut through the bar of
ia:-
ie being mude 350 ft. along the Clyde Lighthouses Trustees" section (Greenock to Port Glasgow), The navigable depth along the Clyde Lighthouses Trustees Section is being made 25 ft. (L.W.O.S.T.), but the Trustees have powers to go 2 ft. deeper, or to 27 ft. (L.W.0.8.T.).
(Note. If between the en-
trance and the deep sea. there are bars or shoals, where a lesser depth ocours than the mini- mum indicated above, a list of such obstractions and of the depths over them (L.W.0.8.T.) should be given.)
2. In the approach channel
from bar or entrance to berthing accommodation. what is:-
(1) the minimum and
maximum width ? (2) the minimum and maximum depth, L.W.0.8.T.?
3. What is-
(1) the rise and fall of tides
(a) ordinary springs, (b) ordinary neaps?
(2) the rise of ordinary neaps above L.W.0.8.T.?
4. What is the maximum available depth of water-
(a) at piers or wharves,
L.W.O.S.T.?
(b) in the case of enclosed
docks, in the en- trance locks, if any, and at dock quayı, H.W.O.N.T.?
From Port Glasgow to Rothesay Dock the width of the Clyde Navigation channól taries from 300 to 350 ft.. and the depth from 24 to 25 ft. (L.W.O.S.T.).
From Rothesay Dock to the lower end of Glasgow Harbour the width of channel is from 200 ft. to 300 ft. and the depth ranges from 22 ft. to 24 ft. (L.W.O.S.T.).
In Glasgow Harbour the width of the channel varies from 150 ft. to 400 ft. between the quay walls and the (lepth varies from 16 ft. to 28 ft. (L.W.O.S.T.).
At Port Glasgow:-
(1) (a) Ordinary springs, 12 ft.
(b) Ordinary něɛba, 10 ft.
(2) A6 Glasgow, say 2 ft. less in each
case.
(a) The maximum available depth of water at the quay walls of Glasgow Harbour is 28 ft. (L.W.0.8.T.).
(b) At Prince's Dock, which is the deepest enclosed dock, the depth of water is ft. (H.W.O.N.T.).
From the dredged cut referred to above the channel to the part varies from 530 yds. to 1,000 yda, in width, und from ft. tu #t, in depth (L.W.O.S.T.).
Average rise of spring tides, excluding equinoctials. 18 ft. 2 ina. above Old Dock Sill.
Average fall of spring tides, excluding equinoctials, 7 ft. 6 in below Ola Dock Sill.
Average rise of nesp tides, 14 ft. 1 in.
above Old Dock Sill.
Average fall of neap tides, 3 ft. 10 ins.
below Old Dock Sill.
(Old Dock Bill is approximately 10 ft. above the level of low water of equinoctial spring tides.)
(a) At Prince's Landing Stage, 36 ft.
(L.W.O.S.T.).
(b) The depth over the will at the new Gladstone Dock, which in the deepest enclosed dook, in approximately 39 ft. (H.W.O.N.T.).
The width of the navigable channel up to Tilbury Dock is from 800 ft. to 1,000 ft. The channel is of varying depth, the least water available in the Tantlet Channel being about 28 ft. (L.W.0.8.T.).
The width of the channels above Tilbury, generally Width of dredged channel from Thorn Knoll to dork
speaking, gradually decrenses, varying from 200 ft. • entrances, 600 ft.
to 1,000 ft.
Above Tilbury there is a depth of over 30 ft. (L.W.0.8.T.) for about 3 miles. Above that point and to the Albert Dock entrances there is about 18 ft. availabl^ (L.W.0.8.T.). The depth of the channel continues to decrense to 12 ft. (L.W.0.S.T.) below London Bridge.
Depth of channel, 35 ft. (L.W.0.S.T.).
(1) The rise and fall of tides in the river are approxi- (1). (a) Ordinary springs, 13 ft.
mately :---
Ordinary
Springe. Ft. Ins.
(b) Ordinary neaps, 1 ft. 6 ins,
Ordinary (2)
Neaps. Ft. Ins.
Southend Tilbury
17 0
13
U
20 0
16 0
Boyal Albert Dock
21 0
17 0
London Bridge -
21
6
17 0
(2)
The main accommodation in the Port of London The maximum available depth is 40 ft. (L.W.O.S.T.)
consiste of enclosed locks.
at the White Star Dock (not enclosed).
The depth over the inner sill in the entrance locks of
the deepest docks are as follows:-
Tilbury Dock
Royal Albert Dock
*
33 ft. (H.W.O.N.T.). ft. (H.W.O.N.T.).
5 What are the respective lengths of piers, wharves, or (in the case of enclosed docks dock quays, where the maximum depth of water, referred to in Question 4, exists?
What percentage does the total of these lengths bear to the total accommo dation at the port?
The lengths of quay walls in Glasgow Harbour having a depth of 28 ft. (L.W.O.S.T.) are 518, 162, 202, and 539 yards respectively, making un aggregate length of 1,421 yards or
per cent, out of a total length of quayage of 19.234 yards, or nearly 11 miles.
At Prince's Dock there are
dock having a depth of (H.W.O.N.T.).
ft. of
ft.
Prince's Landing Stage is approxi
mately 880 yds. long.
The Gladstone Dock in 1,050 ft. long. The total water ures of the Liverpool Dock Estate is 430 acres, and its
miles. lineal
The quayage 261 Birkenhead Dock area is 172 acres, and its lineal quayage nearly 10 miles.
The length of anys with a depth of 33 ft. (H.W.O.N.T.)
at Tilbury Docks is 13,000 ft., equal to 9 per cent. of the dock accommodation in the port, which umounts in ull to
At the White Star Dock above referred to, there are two quays measuring respectively 1,592 ft. and 1,595 ft. and one quay measuring 620 ft., having a depth of 4 ft. (L.W.Ó.S.T.).
This represents per cent. of the total quay accom
modation at present completed in the docks owned by the London and South Western Railway Go.. which amounts to 18,868 lineal It. In addition to this there is a frontage of 4,500 ft. at the town quaya.
A 2
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