Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
The following components have been considered for calculations:
• Vessel speed: Moderate, 5-10 knots,
• Wave conditions: Heavy swell (Hs=2 m)
• Channel bottom type: Sandy
Although the needed depth for Phase 1 is 19.02 m inside the port (or less when more accurate studies and models
are made), the need for reclamation material and the possibility of calls of larger ships in the future years such as
larger container vessels or Capsize bulk carriers, lead to define a deeper dredging for approach channel (22.00 m)
and basin (20.00 m).
Basin depth (under CD)
Outer Channel depth (under CD)
20.00 m 22.00 m
9.4.2. Horizontal requirements
Table 30: Channel depths.
In order to make a preliminary design of horizontal dimensions of water areas including orientation and alignment of
the approach channel, the manoeuvring areas within breakwaters, turning circle, PIANC Report 121: Harbour
Approach Channels Design Guidelines (2014) is applied. These dimensions are of great importance: first because
they constitute a major part of the overall investment and second because they are difficult to modify once the port has
been built.
Figure 131: Basin and channel width definitions (PIANC)
The overall bottom width (W) of a straight channel is given by:
W WBM Wi WBR WBG
Where W BM is the basic width, Wi is the additional width due to environmental actions, and W BR and W BG are the
additional width due to side banks on each side of the channel.
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