Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
For the case of Colachel-Enayam, those widths are shown in the table below:
Factor Outer Channel (m) Basin (m)
Basic Width (W BM) 88.50 88.50
Vessel speed 0.00 0.00
Cross wind 23.60 23.60
Cross current 41.30 35.40
Environmental (and other) Width
(Wi)
Long. Current 5.90 5.90
Wave height 29.50 0.00
Aids to navigation 11.80 11.80
Bottom surface 5.90 5.90
Depht of waterway 5.90 11.80
Cargo hazards 0.00 0.00
Bank Clearance W BR 59.00 59.00
Bank Clearance W BG 5.90 5.90
Additional width in bends
Drift angle 12.00 12.00
Response time 23.60 23.60
TOTAL 312.90 283.40
Table 31: Horizontal navigational requirements by factors
The entire basin will work as a turning circle, so there will be no inner approach channel properly.
Taking the former numbers as a minimum, and given the need of sand for reclamation, the preliminary dimensions for
the channel are as follows:
Straight Outer Channel
Bend Outer Channel
400.00 m >450.00 m
Table 32: Channel widths.
Regarding stopping distance and turning circle, PIANC states that stopping distance is 3·L oa –1·L oa for tugs to go near
the vessel and 2 L oa for the actual stopping distance-, given the vessel enter the inner channel (or the basin) with an
initial speed of 4 Knots.
The turning circle is the area where vessels are often assisted by tugs to their berths and may be turned beforehand.
For a preliminary design, the nominal diameter for this circle is 2·L oa , which in this case is 2 x 400 m. Then:
CP1832-FR-CP-FinalReportRevised-Report-Ed1.docx 143
www.tamilri.com