Jetties :  These are the structures in the form of piled projections and they are built out from the shore to deep water and they may be constructed either for a navigable river or in the sea.

• In rivers, the jetties divert the current away from the river BANK and thus, the scouring action is prevented.
• As the current is DIVERTED to deep waters, the navigation is also controlled.
• In the sea, the jetties are pr at places where harbour entrance is affected by littoral drift or the sea is SHALLOW for a long distance.
• Thus, they extend from the shore to the deep sea to receive the ships.
• In a limiting sense, a jetty is defined as a narrow structure projecting from the shore into water with berths on one or both SIDES and sometimes at the end also.
•  Jetties are exposed to severe wave action and their structural design is similar to that of breakwater.
• However, the designed standards may be released to a certain extent DUE to the fact that the jetties are usually built normal to the most dangerous wave front.
• The impact caused by the berthing ships will depend on the skill of the berthing officer, local condition of currents, wind, etc.
• The berthing velocity depends upon the condition of approach, wind, etc. and it decreases with the increase in the size of the ships 

Jetties :  These are the structures in the form of piled projections and they are built out from the shore to deep water and they may be constructed either for a navigable river or in the sea.