Satellite imagery Provided Courtesy of NASA "Planetary Photo Journal"
From the Planet Earth Gallery at NASA | Full Sized image available by clicking here
Other Sources of satellite imagery include;
Microsoft TerraServer offers free zoom-able b&w satellite images - View your street via satellite.
Panama Canal, (Spanish; Canal de Panamá), This canal joins the Atlantic and Pacific oceans across the Isthmus of
Panama. Running from Cristóbal on Limón Bay, an arm of the
Caribbean Sea, to Balboa, on the Gulf of Panama. The canal is slightly more than 64 km (40 mi) long, not including the dredged approach channels at either end. The minimum depth is 12.5 m (41 ft), and the minimum width is 91.5 m (300 ft). The construction of the Panama Canal ranks as one of the greatest engineering works of all time.
Location and Structure
The approach to the canal from the Atlantic is along 7.2 km (4.5 mi) of dredged channel. The canal then proceeds for 11.1 km (6.9 mi), veering slightly westward before reaching the Gatun Locks. Ships are lifted 25.9 m (85 ft) by these three locks, to the level of Gatun Lake. The lake was formed as a result of the damming of the Chagres River by the Gatun Dam, which adjoins the locks. The Gatun Locks open directly into one another and are double, as are the other locks, so that one ship can be raised while another is being lowered. All the lock chambers on the Panama Canal have a length of 305 m (1000 ft) and a width of 33.5 m (110 ft).
From the Gatun Locks the canal passes through Gatun Lake in a southern and southeastern direction to the mouth of Gaillard Cut (formerly called Culebra Cut), an excavated channel 13 km (8.1 mi) long. At the end of the Gaillard Cut is the Pedro Miguel Lock, which has a drop of 9.4 m (31 ft). The lock borders Miraflores Lake, which is 16.8 m (55 ft) above the level of the Pacific. The canal passes 2.1 km (1.3 mi) through Miraflores Lake and reaches the two Miraflores Locks. These locks lower ships to Pacific tidewater level. From the Miraflores Locks the canal runs 4 km (2.5 mi) to Balboa on the Gulf of Panama, from which a dredged channel extends approximately 8 km (5 mi) out into the bay. In addition to the canal itself, auxiliary facilities include the Madden Dam on the Chagres River, which provides a reservoir to maintain the level of Gatun Lake during the dry season; breakwaters to protect the channels at either end of the canal; hydroelectric plants at the Gatun and Madden dams; and the Panama Railroad that extends 76.6 km (47.6 mi) from Colón at the Atlantic end of the canal to Panama City on the Pacific.
In 1993 about 12,080 commercial vessels, carrying more than 160 million metric tons of cargo, passed through the canal. Transit time through the canal is seven to eight hours.
Interest in a short route from the Atlantic to the Pacific began with the explorers of
Central America early in the 16th century. Hernán Cortés, the Spanish conqueror of
Mexico, suggested a canal across the Isthmus of Tehuantepec; other explorers favored routes through
Nicaragua and Darién. The first project for a canal through the Isthmus of
Panama was initiated by Holy Roman Emperor Charles V, who in 1523 ordered a survey of the isthmus. A working plan for a canal was drawn up as early as 1529, but was not submitted to the king. In 1534 a local Spanish official suggested a canal route close to that of the present canal. Later, several other canal plans were suggested, but no action was taken.
The Spanish government subsequently abandoned its interest in the canal, but in the early 19th century the books of the German scientist Alexander von Humboldt revived interest in the project, and in 1819 the Spanish government formally authorized the construction of a canal and the creation of a company to build it. Nothing came of this effort, however, and the revolt of the Spanish colonies soon took the control of possible canal sites out of Spanish hands. The republics of
Central America subsequently tried to interest groups in the
United States and
Europe in building a canal, and it became a subject of perennial debate in the Congress of the United States. The discovery of gold in
California in 1848 and the rush of would-be miners stimulated U.S. interest in digging the canal (see Clayton-Bulwer Treaty). Various surveys made between 1850 and 1875 indicated that only two routes were practical, the one across
Panama and that across
Nicaragua. In 1876 an international company was organized; two years later it obtained a concession from the
Colombian government-Panama was then part of
Colombia-to dig a canal across the isthmus.
The international company failed, and in 1880 a
French company was organized by Ferdinand Marie de Lesseps, the builder of the Suez Canal. His company went bankrupt in 1889. U.S. interest in an Atlantic-Pacific canal, however, continued. In 1899 the U.S. Congress created an Isthmian Canal Commission to examine the possibilities of a
Central American canal and to recommend a route. The commission first decided on the
Nicaraguan route, but reversed its decision in 1902 when the reorganized Lesseps company offered its assets to the
United States at a price of $40 million (see Hay-Pauncefote Treaty). The U.S. government negotiated with the
Colombian government to obtain a strip of land 9.5 km (6 mi) wide across the isthmus, but the
Colombian Senate refused to ratify this concession. In 1903, however,
Panama revolted from
Colombia. That same year the
United States and the new state of
Panama signed the Hay-Bunau-Varilla Treaty by which the
United States guaranteed the independence of
Panama and secured a perpetual lease on a 16-km (10-mi) strip for the canal.
Panama was to be compensated by an initial payment of $10 million and an annuity of $250,000, beginning in 1913. The figure was later revised upward in 1936 to $430,000, and in 1955 to $2 million per year.
In 1905 the Isthmian Canal Commission decided to build a canal with locks rather than a sea-level channel, and this plan was approved by the U.S. Congress the following year. President Theodore Roosevelt put the construction work under the direction of the U.S. Army Corps of Engineers; Colonel George W. Goethals was named to head the project.
It was estimated that the canal would be completed in ten years; however, it was in operation by the summer of 1914. The construction involved not only excavating an estimated 143 million cu m (175 million cu yd) of earth, but also sanitizing the entire canal area, which was infested with the mosquitoes that spread yellow fever and malaria. The sanitation work was undertaken by Colonel William C. Gorgas of the U.S. Army Medical Corps, who virtually eliminated the diseases. An unexpected difficulty in the actual construction was the prevalence of slides of earth from the banks of the canal, particularly in the Gaillard Cut. Re-excavation after such slides added about 25 percent to the estimated amount of earth moved. The final cost of the canal was $336 million.
One of the most important later pieces of construction work is the $20 million Thatcher Ferry Bridge, which spans the Pacific entrance to the canal and provides a vital link in the Pan-American Highway. This high-level span, 1647 m (5425 ft) long, was dedicated in 1962. The widening of the Gaillard Cut from 91.5 m (300 ft) to a width of 150 m (600 ft) was completed in 1970. It permitted, for the first time, two-way passage through the entire cut.
In 1977 the
United States and
Panama agreed on two new treaties to replace their 1903 agreement. These treaties provided for
Panama's sovereignty over the Canal Zone shortly after their ratification and its control of the canal itself at the beginning of 2000, but left the
United States the right to defend the canal's neutrality even thereafter. The treaties took effect in 1979.
"Panama Canal," Microsoft® Encarta® 97 Encyclopedia.
© 1993-1996 Microsoft Corporation. All rights reserved.
Past Images from this page
• Home • Up • Anchorage, Alaska • Florida Keys • Gulf of Mexico Coast • Surf City, CA • Ireland Satellite • Mississippi Delta • Mt Shasta, CA, USA • North Carolina • Niagara Falls, Ontario, Canada • Panama Canal • San Diego, CA • Sneads Ferry, NC • Sydney, Australia • Terra, Sol III •
Information about the New Theme & Owners
Meet Ova |
Terra, Sol III
• Home • Up • About . . . • Area History • Business Centre • Military Info • News Centre • Reference Center • Theological Centre • US Northeast • Site Search •
October 11, 2006 11:21 PM.