Mar 29, 2020

Corinth Canal waterway, Greece

The Corinth Canal connects the Gulf of Corinth with the Saronic Gulf in the Aegean Sea. It cuts through the narrow Isthmus of Corinth and separates the Peloponnese from the Greek mainland, arguably making the peninsula an island. The canal was dug through the Isthmus at sea level and has no locks. It is 6.4 kilometers (4 mi) in length and only 21.4 meters (70 ft) wide at its base, making it impassable for most modern ships. Nowadays it has little economic importance and is mainly a tourist attraction. The canal was initially proposed in classical times and a failed effort was made to build it in the 1st century AD. Construction started in 1881 but was hampered by geological and financial problems that bankrupted the original builders. It was completed in 1893 but, due to the canal's narrowness, navigational problems and periodic closures to repair landslides from its steep walls, it failed to attract the level of traffic expected by its operators. 
 






 

 

 


 
 
The Corinth Canal is named after the Greek city of Corinth, which is the nearest city to the isthmus. The Canal has steep limestone walls that soar about 300 feet from the water level to the top of the Canal but is only 70 feet wide at sea level. Ships must be narrower than 58 feet wide to transit the Canal. This small size was appropriate when the Canal was built in the late 19th century, but it is way too small for today’s cargo and passenger ships. In today’s world of mega-ships, the Corinth Canal is primarily used by small cruise ships and tour boats.

The idea of a canal was revived after Greece gained formal independence from the Ottoman Empire in 1830. The Greek statesman Ioannis Kapodistrias asked a French engineer to assess the feasibility of the project but had to abandon it when its cost was assessed at 40 million gold francs—far too expensive for the newly independent country. Fresh impetus was given by the opening of the Suez Canal in 1869 and the following year, the government of Prime Minister Thrasyvoulos Zaimis passed a law authorizing the construction of a Corinth Canal. French entrepreneurs were put in charge but, following the bankruptcy of the French company that had attempted to dig the Panama Canal, French banks refused to lend money and the company went bankrupt as well. A fresh concession was granted to the Société Internationale du Canal Maritime de Corinthe in 1881, which was commissioned to construct the canal and operate it for the next 99 years. Construction was formally inaugurated on 23 April 1882 in the presence of King George I of Greece.

The company's initial capital was 30,000,000 francs (US$6.0 million in the money of the day), but after eight years of work it ran out of money and a bid to issue 60,000 bonds of 500 francs each flopped when less than half of the bonds were sold. The company's head, István Türr, went bankrupt, as did the company itself and a bank that had agreed to raise additional funds for the project. Construction resumed in 1890 when the project was transferred to a Greek company, and was completed on 25 July 1893 after eleven years' work.

The canal experienced financial and operational difficulties after completion. The narrowness of the canal makes navigation difficult. Its high walls channel wind along its length, and the different times of the tides in the two gulfs cause strong tidal currents in the channel. For these reasons, many ship operators were unwilling to use the canal, and traffic was far below predictions. Annual traffic of just under 4 million net tons had been anticipated, but by 1906 traffic had reached only half a million net tons annually. By 1913 the total had risen to 1.5 million net tons, but the disruption caused by World War I resulted in a major decline in traffic.The Corinth Canal seen from the air, showing the steep limestone walls which proved vulnerable to landslides. Another persistent problem was the heavily faulted nature of the sedimentary rock, in an active seismic zone, through which the canal is cut. The canal's high limestone walls have been persistently unstable from the start. Although it was formally opened in July 1893 it was not opened to navigation until the following November, due to landslides. It was soon found that the wake from ships passing through the canal undermined the walls, causing further landslides. This required further expense in building retaining walls along the water's edge for more than half of the length of the canal, using 165,000 cubic meters of masonry. Between 1893 and 1940, it was closed for a total of four years for maintenance to stabilize the walls. In 1923 alone, 41,000 cubic metres of material fell into the canal, which took two years to clear out.

Serious damage was caused to the canal during World War II. On 26 April 1941, during the Battle of Greece between defending British troops and the invading forces of Nazi Germany, German parachutists and glider troops attempted to capture the main bridge over the canal. The bridge was defended by the British and had been wired for demolition. The Germans surprised the defenders with a glider-borne assault in the early morning of 26 April and captured the bridge, but the British set off the charges and destroyed the structure. Other authors maintain that German pioneers cut the detonation wires, and a lucky hit by British artillery triggered the explosion. The bridge was replaced by a combined rail/road bridge built in 25 days by the IV Railway Engineer Battalion, of the Royal Italian Army's Railway Engineer Regiment. Three years later, as German forces retreated from Greece, the canal was put out of action by German "scorched earth" operations. German forces used explosives to trigger landslides to block the canal, destroyed the bridges and dumped locomotives, bridge wreckage and other infrastructure into the canal to hinder repairs. The United States Army Corps of Engineers began to clear the canal in November 1947 and reopened it for shallow-draft traffic by 7 July 1948, and for all traffic by that September.

The canal consists of a single channel 8 metres (26 ft) deep, excavated at sea level (thus requiring no locks), measuring 6,343 metres (20,810 ft) long by 24.6 metres (81 ft) wide at sea level and 21.3 metres (70 ft) wide at the bottom. The rock walls, which rise 90 metres (300 ft) above sea level, are at a near-vertical 80° angle. The canal is crossed by a railway line, a road and a motorway at a height of about 45 metres (148 ft). In 1988 submersible bridges were installed at sea level at each end of the canal, by the eastern harbour of Isthmia and the western harbour of Poseidonia. Although the canal saves the 700-kilometre (430 mi) journey around the Peloponnese, it is too narrow for modern ocean freighters, as it can accommodate ships only of a width up to 17.6 meters (58 ft) and draft up to 7.3 metres (24 ft). In October 2019, With over 900 passengers on board, a 22.5 meters (74 ft) wide and 195 metres (640 ft) long Fred. Olsen Cruise Lines cruise ship successfully traversed the canal to set a new record for longest ship to pass through the canal. Ships can pass through the canal only one convoy at a time on a one-way system. Larger ships have to be towed by tugs. The canal is currently used mainly by tourist ships; around 11,000 ships per year travel through the waterway.
 
For more information - Corinth Canal

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