PANAMA CANAL

The Panama Canal is a 77.1-kilometre (48 mi) ship canal in Panama that connects the Atlantic Ocean (via the Caribbean Sea) to the Pacific Ocean. The canal cuts across the Isthmus of Panama and is a key conduit for international maritime trade. There are locks at each end to lift ships up to Gatun Lake, 26 metres (85 ft) above sea level. Gatun Lake was created to reduce the amount of work required for the canal. The current locks are 33.5 metres (110 ft) wide. A third, wider lane of locks is currently under construction and is due to open in 2015.

Layout

The canal consists of artificial lakes, several improved and artificial channels, and three sets of locks. An additional artificial lake, Alajuela Lake (known during the American era as Madden Lake), acts as a reservoir for the canal. The layout of the canal as seen by a ship passing from the Atlantic to the Pacific is as follows:
While, globally, the Atlantic Ocean is east of the isthmus and the Pacific to the west, the general direction of the canal passage from the Atlantic to the Pacific is from northwest to southeast. This is because of a local anomaly in the shape of the isthmus at the point the canal occupies. The Bridge of the Americas (Spanish: Puente de las Américas) at the Pacific side is about a third of a degree east of the Colón end on the Atlantic side.^[35] Still, in formal nautical communications, the simplified directions "Southbound" and "Northbound" are used.

Lock size

Initially the locks at Gatun had been designed to be 28.5 m (94 ft) wide. In 1908, the United States Navy requested that width be increased to at least 36 m (118 ft), which would allow the passage of U.S. naval ships. Eventually a compromise was made and the locks were built 33.53 m (110.0 ft) wide. Each lock is 320 m (1,050 ft) long, with the walls ranging in thickness from 15 m (49 ft) at the base to 3 m (9.8 ft) at the top. The central wall between the parallel locks at Gatun is 18 m (59 ft) thick and over 24 m (79 ft) high. The steel lock gates measure an average of 2 m (6.6 ft) thick, 19.5 m (64 ft) wide, and 20 m (66 ft) high. It is the size of the locks, specifically the Pedro Miguel Locks, along with the height of the Bridge of the Americas at Balboa, that determine the Panamax metric and limit the size of ships that may use the canal.The size of the locks determines the maximum size of a ship that can pass through them. Because of the importance of the canal to international trade, many ships are built to the maximum size allowed. These are known as Panamax vessels. A Panamax cargo ship typically has a DWT of 65,000–80,000 tonnes, but its actual cargo is restricted to about 52,500 tonnes because of the 12.6 m (41.2 ft) draft restrictions within the canal. The longest ship ever to transit the canal was the San Juan Prospector (now Marcona Prospector), an ore-bulk-oil carrier that is 296.57 m (973 ft) long with a beam of 32.31 m (106 ft).^[41]

Capacity

The canal is currently handling more vessel traffic than had ever been envisioned by its builders. In 1934 it was estimated that the maximum capacity of the canal would be around 80 million tons per year; as noted above, canal traffic in 2009 reached 299.1 million tons of shipping.

Implementation of an enhanced locks lighting system;To improve capacity, a number of improvements have been imposed on the current canal system. These improvements aim to maximize the possible use of current locking system:

• Construction of two tie-up stations in Gaillard Cut;
• Widening Gaillard Cut from 192 to 218 metres (630 to 715 ft);
• Improvements to the tugboat fleet;
• Implementation of the carousel lockage system in Gatun locks;
• Development of an improved vessel scheduling system;
• Deepening of Gatun Lake navigational channels from 10.4 to 11.3 metres (34 to 37 ft) PLD;
• Modification of all locks structures to allow an additional draft of about 0.30 metres (0.98 ft);
• Deepening of the Pacific and Atlantic entrances;
• Construction of a new spillway in Gatun, for flood control.

These improvements will enlarge the capacity from 280–90 million PCUMS (2008) to 330–40 PCUMS (2012).

Source Code : http://en.wikipedia.org/wiki/Panama_Canal