68
PORTS AND HARBOURS OF THE BRITISH EMPIRE :
Question.
Capetown.
Durban.
the minimum width ? minimum (2) the
1. At bar or entrance, what This question is not applicable to Cape
16:-
town, the docke being entered direct from the open sea, but it may be mentioned that
there ia good anchorage in Table Bay in 30 to 48 ft. of water (L.W.O.S.T.).
(1)
(2) 35 ft. 3 ins. (L.W.O.S.T.).
UNION OF SOUTH AFRICA.
East London (Buffalo Harbour),
(1) Width of dredged channel at bar ft. (2) Minimum depth 20 ft. (L.W.O.S.T.)
Note-There is a patch of submerged rook with 22 ft. 9 ina. (L.W.Ö.S.T.) just opposite the present south breakwater head.
Port Elizabeth (Algoa Bay).
Port Elizabeth is an open roadstead.
69
navigable depth, L.W.O.S.T. I (Meta-If between the en-
trance and the deep sea there are bars or shoals where a lesser depth occurs than the mini- mum indicated above, a list of such obstructions and of the depths over thom (L.W.0.6.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.O.S.T.?
(1) Width of entrance into Victoria Width and depth of channel vary, but
Basin, 250 ft.
(2) Depth of entrance. 38
(L.W.O.S.T.).
ft.
nowhere is there a less depth than 31 ft. (L.W.O.S.T.).
Width at entrance to Buffalo River 150 ft. widening
out to 500 ft. opposite west quay. Depth of dredged channel of Buttalo River. 24 ft.
(L.W.O.S.T.).
The depth at the ordinary working anchorage is 36 ft.
(L.W.O.S.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.
(1) (a) Ordinary springs, 4 ft. 6 in.
(2)
(b) Ordinary peaps, 2 ft.
(1) (a) Ordinary springs, 6 ft.
(1) (a) Ordinary springs. 5 ft. 6 in.
(b) Ordinary neaps, 3 ft. 6 ine.
(5) Ordinary neaps, 1 ft. 9 in.
(2)
(2)
(1) (8) Ordinary springs. 5 ft. 8 ins.
(8) Ordinary neaps, 2 ft.
(2) H.W.O.N.T. is 3 ft. 10 ins, above L.W.0.5.T.
4. What in the maximum No enclosed docks.
available depth of water-
(a) at piers or wharves,
L.W.0.8.T.?
(b) in the case of enclosed
docks, in the ea
trance looks, if any,
and at dock quays. H.W.O.N.T.I
Maximum available depth at quays,
36 ft. (L.W.O.S.T.) at the east pier.
No enclosed docks.
Maximum available depth at quays,
38 ft. ins. (L.W.O.S.T.).
No enclosed docks.
The largest vessels at present load and unload at the
anchorage ontside the Buffalo River. Maximum available depth at quaya in river, 27 ft. 9 ins.
(L.W.O.S.T.).
No enclosed docks.
At the Dom Pedro Jetty one berth gives a least depth
of water of 21 ft. (L.W.0.8.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, exísta ?
What percentage does the total of these lengths bear to the total accommo- dation at the port ?
This depth of 36 ft. (L.W.O.S.T.) is found along the whole length of the east pier, which is 786 ft. The total accommodation at the port at
present is
This depth of 38 ft. 6 ins. (L.W.O.S.T.) is found for a length of 710 ft. (one barth only). This representa 51 per cent. of the total accommodation of the port.
This depth of 27 ft. 9 ins. is found for a length of
1,000 ft. (west quay), und 500 ft. (east quay). These two lengths together represent one quartar of
the total accommodation of the port.
This depth of 21 ft. (L.W.O.S.T.) is found for a length of 300 ft. This is practically the whole acconimoda- tion, as the wharves are used for lighterage.
A 18220-App. 35+ Be
:
598
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