Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
1. INTRODUCTION
The aim of this work is the design of the port structures (rubble-mound breakwater and vertical
breakwater).
For the breakwater design have been considered 200 years of return period with 5.0 meters of wave
height and a 11,5 seconds wave period.
The most important formulations have been obtained from:
• CIRIA ROCK MANUAL
• SPM ( Shore Protection Manual)
• ROM
• PIANC
• CLI (Concrete Layer Innovations)
• Others
2. DATA FOR BREAKWATERS DESIGN
2.1. TIDAL LEVELS:
The tides in the region are mixed tides.
The tidal levels are shown in the table below:
Highest Astronomical Tide.
HAT: The elevation of the highest predicted astronomical tide expected to uccur. at least 1.05
once a year
HHWS Highest High Water Spring 1.04
MHHW
Mean Higher High water.
The mean of the higher of the two daily high waters over a long period of time. 0.83
When only one high water occurs on a day, this is taken as a higher high water .
MLHW
Mean Lower High Water.
The mean of the lower of two daily high waters over a long period of time. When only 0.67
one high water occurs on a day, no value is printed in the MLHW column, indicating
that the tide is diurnal .
MHLW
Mean Higher Low Water.
The mean of the higher of the two daily low waters over a long period of time. 0.41
When only one low water occurs on a day, no value is printed in the MHLW column,
indicating that the tide is diurnal .
MLLW
Mean Lower Low Water.
The mean of the lower of the daily low waters over a long period of time. When only
one low water occurs a day, this is taken as the lower low water
0.25
LLWS Lowest Low Water Spring 0.02
Lowest Astronomical Tide.
LAT All heights have been taken above the lowest astronomical tide 0.00
GT
Great Diurnal Range
The difference in height between mean higher high water (MHHW) and mean lower
low water (MLLW).
0.58
CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 2
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