Tides and Currents
Tidal heights MHWS 2.5 m (8'), MHWN 1.9 m (6') and MLWS 0.4 m
(1'). The springtides are regular, but the neaps are irregular.
Frequently the tide will be rising at Douala, while there is a decided
out-going stream running in the river. The rate of the stream is from 2 to 3
knots at half tide. In the deep channel between Light Buoy
''C'' and the Base Light Buoy a very strong tidal stream is
sometimes experienced, the out-going stream attaining a rate of 5 knots at
springs. Between the Base Light Buoy and the next buoy NNE of it, thein-going
stream sets eastward and the out-going stream westward.
The out-going tidal stream sets strongly towards the ''Tetes de
Chiens'' shoals, and mariners are cautioned against getting too
close to the E side of the channel. After a series of heavy rains the
out-going stream will run from 7 to 8 hours attaining a max. rate of 2 3/4
knots, and the in-going stream from 4 to 5 hours at a rate of less than 2
knots. The level of the river in the rainy season is 0.5 m higher than that
in the dry season. In the dredged channel, in the approach to Douala, the
in-going stream sets NW on to the black buoys, and the out-going stream
sets SW on to the red buoys.
Wind and Sea
During the dry season (December - mid March) the SW sea-breeze can reach a
force of about 10 m/sec. (5 - Beaufort). Dangerous winds are rare but heavy
rains fall during the wet season (March-November).