National Archives and Records Administration
The National Archives and Records Administration is an independent agency of the United States government charged with preserving and documenting government and historical records and with increasing public access to those documents, which comprise the National Archives. NARA is responsible for maintaining and publishing the authentic and authoritative copies of acts of Congress, presidential directives, federal regulations; the NARA transmits votes of the Electoral College to Congress. The Archivist of the United States is the chief official overseeing the operation of the National Archives and Records Administration; the Archivist not only maintains the official documentation of the passage of amendments to the U. S. Constitution by state legislatures, but has the authority to declare when the constitutional threshold for passage has been reached, therefore when an act has become an amendment; the Office of the Federal Register publishes the Federal Register, Code of Federal Regulations, United States Statutes at Large, among others.
It administers the Electoral College. The National Historical Publications and Records Commission —the agency's grant-making arm—awards funds to state and local governments and private archives and universities, other nonprofit organizations to preserve and publish historical records. Since 1964, the NHPRC has awarded some 4,500 grants; the Office of Government Information Services is a Freedom of Information Act resource for the public and the government. Congress has charged NARA with reviewing FOIA policies and compliance of Federal agencies and to recommend changes to FOIA. NARA's mission includes resolving FOIA disputes between Federal agencies and requesters; each branch and agency of the U. S. government was responsible for maintaining its own documents, which resulted in the loss and destruction of records. Congress established the National Archives Establishment in 1934 to centralize federal record keeping, with the Archivist of the United States as chief administrator; the National Archives was incorporated with GSA in 1949.
The first Archivist, R. D. W. Connor, began serving in 1934; as a result of a first Hoover Commission recommendation, in 1949 the National Archives was placed within the newly formed General Services Administration. The Archivist served as a subordinate official to the GSA Administrator until the National Archives and Records Administration became an independent agency on April 1, 1985. In March 2006, it was revealed by the Archivist of the United States in a public hearing that a memorandum of understanding between NARA and various government agencies existed to "reclassify", i.e. withdraw from public access, certain documents in the name of national security, to do so in a manner such that researchers would not be to discover the process. An audit indicated that more than one third withdrawn since 1999 did not contain sensitive information; the program was scheduled to end in 2007. In 2010, Executive Order 13526 created the National Declassification Center to coordinate declassification practices across agencies, provide secure document services to other agencies, review records in NARA custody for declassification.
NARA's holdings are classed into "record groups" reflecting the governmental department or agency from which they originated. Records include paper documents, still pictures, motion pictures, electronic media. Archival descriptions of the permanent holdings of the federal government in the custody of NARA are stored in the National Archives Catalog; the archival descriptions include information on traditional paper holdings, electronic records, artifacts. As of December 2012, the catalog consisted of about 10 billion logical data records describing 527,000 artifacts and encompassing 81% of NARA's records. There are 922,000 digital copies of digitized materials. Most records at NARA are in the public domain, as works of the federal government are excluded from copyright protection. However, records from other sources may still be protected by donor agreements. Executive Order 13526 directs originating agencies to declassify documents if possible before shipment to NARA for long-term storage, but NARA stores some classified documents until they can be declassified.
Its Information Security Oversight Office monitors and sets policy for the U. S. government's security classification system. Many of NARA's most requested records are used for genealogy research; this includes census records from 1790 to 1940, ships' passenger lists, naturalization records. Archival Recovery Teams investigate the theft of records; the most well known facility of the National Archives and Records Administration is the National Archives Building, located north of the National Mall on Constitution Avenue in Washington, D. C.. A sister facility, known as the National Archives at College Park was opened 1994 near the University of Maryland, College Park; the Washington National Records Center located in the Washington, D. C. metropolitan area, is a large warehouse facility where federal records that are still under the control of the creating agency are stored. Federal government agencies pay a yearly fee for storage at the facility. In accordance with federal records schedules, documents at WNRC are transferred to the legal custody of the National Archives after a certain time.
Temporary records at WNRC are
A waterway is any navigable body of water. Broad distinctions are useful to avoid ambiguity, disambiguation will be of varying importance depending on the nuance of the equivalent word in other languages. A first distinction is necessary between maritime shipping routes and waterways used by inland water craft. Maritime shipping routes cross oceans and seas, some lakes, where navigability is assumed, no engineering is required, except to provide the draft for deep-sea shipping to approach seaports, or to provide a short cut across an isthmus. Dredged channels in the sea are not described as waterways. There is an exception to this initial distinction for legal purposes, see under international waters. Where seaports are located inland, they are approached through a waterway that could be termed "inland" but in practice is referred to as a "maritime waterway"; the term "inland waterway" refers to navigable rivers and canals designed to be used by inland waterway craft only, implicitly of much smaller dimensions than seagoing ships.
In order for a waterway to be navigable, it must meet several criteria: it must be deep enough to accommodate vessels loading to the design draft. Vessels using waterways vary from small animal-drawn barges to immense ocean tankers and ocean liners, such as cruise ships; the European Conference of Ministers of Transport established in 1953 a classification of waterways, expanded to take into account the development of push-towing. Europe is a continent with a great variety of waterway characteristics, which makes this classification valuable to appreciate the different classes of waterway. There is a remarkable variety of waterway characteristics in many countries of Asia, but there has not been any equivalent international drive for uniformity; this classification is provided by the UN Economic Commission for Europe, Inland Transport Committee, Working Party on Inland Water Transport. A low resolution version of that map is shown here. Media related to Waterways at Wikimedia Commons Blue Book on European inland waterways - access to the Blue Book database.
The objective of the “Blue Book” is to establish an inventory of existing and envisaged standards and parameters of "E-waterways" and ports in Europe and to show, on an internationally comparable basis, the current inland navigation infrastructure parameters prescribed on the Agreement on Main Inland Waterways of International Importance Waterscape - Britain's official guide to canals and lakes
A river is a natural flowing watercourse freshwater, flowing towards an ocean, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, brook and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the hydrological cycle. Potamology is the scientific study of rivers, while limnology is the study of inland waters in general. Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, as a means of disposing of waste.
A river begins at a source, follows a path called a course, ends at a mouth or mouths. The water in a river is confined to a channel, made up of a stream bed between banks. In larger rivers there is also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be wide in relation to the size of the river channel; this distinction between river channel and floodplain can be blurred in urban areas where the floodplain of a river channel can become developed by housing and industry. Rivers can flow down mountains, through valleys or along plains, can create canyons or gorges; the term upriver refers to the direction towards the source of the river, i.e. against the direction of flow. The term downriver describes the direction towards the mouth of the river, in which the current flows; the term left bank refers to the left bank in the direction of right bank to the right. The river channel contains a single stream of water, but some rivers flow as several interconnecting streams of water, producing a braided river.
Extensive braided rivers are now found in only a few regions worldwide, such as the South Island of New Zealand. They occur on peneplains and some of the larger river deltas. Anastamosing rivers are quite rare, they have multiple sinuous channels carrying large volumes of sediment. There are rare cases of river bifurcation in which a river divides and the resultant flows ending in different seas. An example is the bifurcation of Nerodime River in Kosovo. A river flowing in its channel is a source of energy which acts on the river channel to change its shape and form. In 1757, the German hydrologist Albert Brahms empirically observed that the submerged weight of objects that may be carried away by a river is proportional to the sixth power of the river flow speed; this formulation is sometimes called Airy's law. Thus, if the speed of flow is doubled, the flow would dislodge objects with 64 times as much submerged weight. In mountainous torrential zones this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks.
A river valley, created from a U-shaped glaciated valley, can easily be identified by the V-shaped channel that it has carved. In the middle reaches where a river flows over flatter land, meanders may form through erosion of the river banks and deposition on the inside of bends. Sometimes the river will cut off a loop, shortening the channel and forming an oxbow lake or billabong. Rivers that carry large amounts of sediment may develop conspicuous deltas at their mouths. Rivers whose mouths are in saline tidal waters may form estuaries. Throughout the course of the river, the total volume of water transported downstream will be a combination of the free water flow together with a substantial volume flowing through sub-surface rocks and gravels that underlie the river and its floodplain. For many rivers in large valleys, this unseen component of flow may exceed the visible flow. Most but not all rivers flow on the surface. Subterranean rivers flow underground in caverns; such rivers are found in regions with limestone geologic formations.
Subglacial streams are the braided rivers that flow at the beds of glaciers and ice sheets, permitting meltwater to be discharged at the front of the glacier. Because of the gradient in pressure due to the overlying weight of the glacier, such streams can flow uphill. An intermittent river only flows and can be dry for several years at a time; these rivers are found in regions with limited or variable rainfall, or can occur because of geologic conditions such as a permeable river bed. Some ephemeral rivers flow during the summer months but not in the winter; such rivers are fed from chalk aquifers which recharge from winter rainfall. In England these rivers are called bournes and give their name to places such as Bournemouth and Eastbourne. In humid regions, the location where flow begins in the smallest tributary streams moves upstream in response to precipitation and downstream in its absence or when active summer vegetation diverts water for evapotrans
Transport or transportation is the movement of humans and goods from one location to another. In other words the action of transport is defined as a particular movement of an organism or thing from a point A to the Point B. Modes of transport include air, water, cable and space; the field can be divided into infrastructure and operations. Transport is important because it enables trade between people, essential for the development of civilizations. Transport infrastructure consists of the fixed installations, including roads, airways, waterways and pipelines and terminals such as airports, railway stations, bus stations, trucking terminals, refueling depots and seaports. Terminals may be used both for maintenance. Vehicles traveling on these networks may include automobiles, buses, trucks, watercraft and aircraft. Operations deal with the way the vehicles are operated, the procedures set for this purpose, including financing and policies. In the transport industry and ownership of infrastructure can be either public or private, depending on the country and mode.
Passenger transport may be public. Freight transport has become focused on containerization, although bulk transport is used for large volumes of durable items. Transport plays an important part in economic growth and globalization, but most types cause air pollution and use large amounts of land. While it is subsidized by governments, good planning of transport is essential to make traffic flow and restrain urban sprawl. Humans' first means of transport involved walking and swimming; the domestication of animals introduced a new way to lay the burden of transport on more powerful creatures, allowing the hauling of heavier loads, or humans riding animals for greater speed and duration. Inventions such as the wheel and the sled helped make animal transport more efficient through the introduction of vehicles. Water transport, including rowed and sailed vessels, dates back to time immemorial, was the only efficient way to transport large quantities or over large distances prior to the Industrial Revolution.
The first forms of road transport involved animals, such as horses, oxen or humans carrying goods over dirt tracks that followed game trails. Many early civilizations, including those in Mesopotamia and the Indus Valley, constructed paved roads. In classical antiquity, the Persian and Roman empires built stone-paved roads to allow armies to travel quickly. Deep roadbeds of crushed stone underneath kept such roads dry; the medieval Caliphate built tar-paved roads. The first watercraft were canoes cut out from tree trunks. Early water transport was accomplished with ships that were either rowed or used the wind for propulsion, or a combination of the two; the importance of water has led to most cities that grew up as sites for trading being located on rivers or on the sea-shore at the intersection of two bodies of water. Until the Industrial Revolution, transport remained slow and costly, production and consumption gravitated as close to each other as feasible; the Industrial Revolution in the 19th century saw a number of inventions fundamentally change transport.
With telegraphy, communication became independent of the transport of physical objects. The invention of the steam engine followed by its application in rail transport, made land transport independent of human or animal muscles. Both speed and capacity increased allowing specialization through manufacturing being located independently of natural resources; the 19th century saw the development of the steam ship, which sped up global transport. With the development of the combustion engine and the automobile around 1900, road transport became more competitive again, mechanical private transport originated; the first "modern" highways were constructed during the 19th century with macadam. Tarmac and concrete became the dominant paving materials. In 1903 the Wright brothers demonstrated the first successful controllable airplane, after World War I aircraft became a fast way to transport people and express goods over long distances. After World War II the automobile and airlines took higher shares of transport, reducing rail and water to freight and short-haul passenger services.
Scientific spaceflight began in the 1950s, with rapid growth until the 1970s, when interest dwindled. In the 1950s the introduction of containerization gave massive efficiency gains in freight transport, fostering globalization. International air travel became much more accessible in the 1960s with the commercialization of the jet engine. Along with the growth in automobiles and motorways and water transport declined in relative importance. After the introduction of the Shinkansen in Japan in 1964, high-speed rail in Asia and Europe started attracting passengers on long-haul routes away from the airlines. Early in U. S. history, private joint-stock corporations owned most aqueducts, canals, railroads and tunnels. Most such transport infrastructure came under government control in the late 19th and early 20th centuries, culminating in the nationalization of inter-city passenger rail-service with the establishment of Amtrak. However, a movement to privatize roads and other infrastructure has gained some ground and adherents.
A mode of transport is a solution that makes use of a particular type of vehicle and operation. The transport of a person or of cargo may invol
A lake is an area filled with water, localized in a basin, surrounded by land, apart from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, therefore are distinct from lagoons, are larger and deeper than ponds, though there are no official or scientific definitions. Lakes can be contrasted with rivers or streams, which are flowing. Most lakes streams. Natural lakes are found in mountainous areas, rift zones, areas with ongoing glaciation. Other lakes are found along the courses of mature rivers. In some parts of the world there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will fill in with sediments or spill out of the basin containing them. Many lakes are artificial and are constructed for industrial or agricultural use, for hydro-electric power generation or domestic water supply, or for aesthetic, recreational purposes, or other activities.
The word lake comes from Middle English lake, from Old English lacu, from Proto-Germanic *lakō, from the Proto-Indo-European root *leǵ-. Cognates include Dutch laak, Middle Low German lāke as in: de:Wolfslake, de:Butterlake, German Lache, Icelandic lækur. Related are the English words leak and leach. There is considerable uncertainty about defining the difference between lakes and ponds, no current internationally accepted definition of either term across scientific disciplines or political boundaries exists. For example, limnologists have defined lakes as water bodies which are a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are used to separate ponds and lakes. Definitions for lake range in minimum sizes for a body of water from 2 hectares to 8 hectares. Charles Elton, one of the founders of ecology, regarded lakes as waterbodies of 40 hectares or more.
The term lake is used to describe a feature such as Lake Eyre, a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with the word pond, a lesser number of names ending with lake are in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example every lake is called a pond, whereas in Wisconsin every pond is called a lake."One hydrology book proposes to define the term "lake" as a body of water with the following five characteristics: it or fills one or several basins connected by straits has the same water level in all parts it does not have regular intrusion of seawater a considerable portion of the sediment suspended in the water is captured by the basins the area measured at the mean water level exceeds an arbitrarily chosen threshold With the exception of the seawater intrusion criterion, the others have been accepted or elaborated upon by other hydrology publications.
The majority of lakes on Earth are freshwater, most lie in the Northern Hemisphere at higher latitudes. Canada, with a deranged drainage system has an estimated 31,752 lakes larger than 3 square kilometres and an unknown total number of lakes, but is estimated to be at least 2 million. Finland has larger, of which 56,000 are large. Most lakes have at least one natural outflow in the form of a river or stream, which maintain a lake's average level by allowing the drainage of excess water; some lakes do not have a natural outflow and lose water by evaporation or underground seepage or both. They are termed endorheic lakes. Many lakes are artificial and are constructed for hydro-electric power generation, aesthetic purposes, recreational purposes, industrial use, agricultural use or domestic water supply. Evidence of extraterrestrial lakes exists. Globally, lakes are outnumbered by ponds: of an estimated 304 million standing water bodies worldwide, 91% are 1 hectare or less in area. Small lakes are much more numerous than large lakes: in terms of area, one-third of the world's standing water is represented by lakes and ponds of 10 hectares or less.
However, large lakes account for much of the area of standing water with 122 large lakes of 1,000 square kilometres or more representing about 29% of the total global area of standing inland water. Hutchinson in 1957 published a monograph, regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, distribution; as summarized and discussed by these researchers, Hutchinson presented in it a comprehensive analysis of the origin of lakes and proposed what is a accepted classification of lakes according to their origin. This
Padua is a city and comune in Veneto, northern Italy. It is the capital of the economic and communications hub of the area. Padua's population is 214,000; the city is sometimes included, with Venice and Treviso, in the Padua-Treviso-Venice Metropolitan Area which has a population of c. 2,600,000. Padua stands on 29 km southeast of Vicenza; the Brenta River, which once ran through the city, still touches the northern districts. Its agricultural setting is the Venetian Plain. To the city's south west lies the Euganaean Hills, praised by Lucan and Martial, Ugo Foscolo, Shelley, it hosts the University of Padua, founded in 1222, where Galileo Galilei was a lecturer between 1592 and 1610. The city is picturesque, with a dense network of arcaded streets opening into large communal piazze, many bridges crossing the various branches of the Bacchiglione, which once surrounded the ancient walls like a moat. Padua is the setting for most of the action in Shakespeare's The Taming of the Shrew. There is a play by the Irish writer Oscar Wilde entitled The Duchess of Padua.
The city is known for being the city where Saint Anthony, a Portuguese Franciscan, spent part of his life and died in 1231. The original significance of the Roman name Patavium is uncertain, it may be connected with the ancient name of the River Po. Additionally, the root pat-, in the Indo-European language may refer to a wide open plain as opposed to nearby hills; the suffix -av (also found in the name of the rivers such as the Timavus and Tiliaventum is of Venetic origin indicating the presence of a river, which in the case of Padua is the Brenta. The ending - ium, signifies the presence of villages. Padua claims to be the oldest city in northern Italy. According to a tradition dated at least to the time of Virgil's Aeneid and to Livy's Ab Urbe Condita, Padua was founded in around 1183 BC by the Trojan prince Antenor. After the Fall of Troy, Antenor led a group of Trojans and their Paphlagonian allies, the Eneti or Veneti, who lost their king Pylaemenes to settle the Euganean plain in Italy.
Thus, when a large ancient stone sarcophagus was exhumed in the year 1274, officials of the medieval commune declared the remains within to be those of Antenor. An inscription by the native Humanist scholar Lovato dei Lovati placed near the tomb reads: This sepulchre excavated from marble contains the body of the noble Antenor who left his country, guided the Eneti and Trojans, banished the Euganeans and founded Padua However, more recent tests suggest the sepulchre dates to the between the 4th and 3rd centuries BC. Archeological remains confirm an early date for the foundation of the center of the town to between the 11th and 10th centuries BC. By the 5th century BC, rose on the banks of the river Brenta, which in the Roman era was called Medoacus Maior and until AD 589 followed the path of the present day Bacchiglione. Padua was one of the principal centers of the Veneti; the Roman historian Livy records an attempted invasion by the Spartan king Cleonimos around 302 BC. The Spartans came up the river but were defeated by the Veneti in a naval battle and gave up the idea of conquest.
Still the Veneti of Padua repulsed invasions by the Etruscans and Gauls. According to Livy and Silius Italicus, the Veneti, including those of Padua, formed an alliance with the Romans by 226 BC against their common enemies, first the Gauls and the Carthaginians. Men from Padua died beside the Romans at Cannae. With Rome's northwards expansion, Padua was assimilated into the Roman Republic. In 175 BC, Padua requested the aid of Rome in putting down a local civil war. In 91 BC, along with other cities of the Veneti, fought with Rome against the rebels in the Social War. Around 49 BC, Padua was made a Roman municipium under the Lex Julia Municipalis and its citizens ascribed to the Roman tribe, Fabia. At that time the population of the city was 40,000; the city was reputed for the wool of its sheep. In fact, the poet Martial remarks on the thickness of the tunics made there. By the end of the first century BC, Padua seems to have been the wealthiest city in Italy outside of Rome; the city became so powerful that it was able to raise two hundred thousand fighting men.
However, despite its wealth, the city was renowned for its simple manners and strict morality. This concern with morality is reflected in Livy's Roman History wherein he portrays Rome's rise to dominance as being founded upon her moral rectitude and discipline. Still Pliny, referring to one of his Paduan protégés' Paduan grandmother, Sarrana Procula, lauds her as more upright and disciplined than any of her strict fellow citizens. Padua provided the Empire with notable intellectuals. Nearby Abano was the birthplace, after many years spent in Rome, the deathplace of Livy, whose Latin was said by the critic Asinius Pollio to betray his Patavinitas. Padua was the birthplace of Thrasea Paetus, Asconius Pedianus, Valerius Flaccus. Christianity was introduced to much of the Veneto by Saint Prosdocimus, he is venerated as the first bishop of the city. His deacon, the Jewish convert Daniel, is a
Canals, or navigations, are human-made channels, or artificial waterways, for water conveyance, or to service water transport vehicles. In most cases, the engineered works will have a series of dams and locks that create reservoirs of low speed current flow; these reservoirs are referred to as slack water levels just called levels. A canal is known as a navigation when it parallels a river and shares part of its waters and drainage basin, leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley. In contrast, a canal cuts across a drainage divide atop a ridge requiring an external water source above the highest elevation. Many canals have been built at elevations towering over valleys and other water ways crossing far below. Canals with sources of water at a higher level can deliver water to a destination such as a city where water is needed; the Roman Empire's aqueducts were such water supply canals. A navigation is a series of channels that run parallel to the valley and stream bed of an unimproved river.
A navigation always shares the drainage basin of the river. A vessel uses the calm parts of the river itself as well as improvements, traversing the same changes in height. A true canal is a channel that cuts across a drainage divide, making a navigable channel connecting two different drainage basins. Most commercially important canals of the first half of the 19th century were a little of each, using rivers in long stretches, divide crossing canals in others; this is true for many canals still in use. Both navigations and canals use engineered structures to improve navigation: weirs and dams to raise river water levels to usable depths. Since they cut across drainage divides, canals are more difficult to construct and need additional improvements, like viaducts and aqueducts to bridge waters over streams and roads, ways to keep water in the channel. There are two broad types of canal: Waterways: canals and navigations used for carrying vessels transporting goods and people; these can be subdivided into two kinds:Those connecting existing lakes, other canals or seas and oceans.
Those connected in a city network: such as the Canal Grande and others of Venice Italy. Aqueducts: water supply canals that are used for the conveyance and delivery of potable water for human consumption, municipal uses, hydro power canals and agriculture irrigation. Canals were of immense importance to commerce and the development and vitality of a civilization. In 1855 the Lehigh Canal carried over 1.2 million tons of anthracite coal. The few canals still in operation in our modern age are a fraction of the numbers that once fueled and enabled economic growth, indeed were a prerequisite to further urbanization and industrialization – for the movement of bulk raw materials such as coal and ores are difficult and marginally affordable without water transport; such raw materials fueled the industrial developments and new metallurgy resulting of the spiral of increasing mechanization during 17th–20th century, leading to new research disciplines, new industries and economies of scale, raising the standard of living for any industrialized society.
The surviving canals, including most ship canals, today service bulk cargo and large ship transportation industries, whereas the once critical smaller inland waterways conceived and engineered as boat and barge canals have been supplanted and filled in, abandoned and left to deteriorate, or kept in service and staffed by state employees, where dams and locks are maintained for flood control or pleasure boating. Their replacement was gradual, beginning first in the United States in the mid-1850s where canal shipping was first augmented by began being replaced by using much faster, less geographically constrained & limited, cheaper to maintain railways. By the early 1880s, canals which had little ability to economically compete with rail transport, were off the map. In the next couple of decades, coal was diminished as the heating fuel of choice by oil, growth of coal shipments leveled off. After World War I when motor-trucks came into their own, the last small U. S. barge canals saw a steady decline in cargo ton-miles alongside many railways, the flexibility and steep slope climbing capability of lorries taking over cargo hauling as road networks were improved, which had the freedom to make deliveries well away from rail lined road beds or ditches in the dirt which couldn't operate in the winter.
Canals are built in one of three ways, or a combination of the three, depending on available water and available path: Human made streamsA canal can be created where no stream presently exists. Either the body of the canal is dug or the sides of the canal are created by making dykes or levees by piling dirt, concrete or other building materials; the finished shape of the canal as seen in cross section is known as the canal prism. The water for the canal must be provided like streams or reservoirs. Where the new waterway must change elevation engineering works like locks, lifts or elevators are constructed to raise and lower vessels. Examples include canals that connect valleys over a higher body of land, like Canal du Midi, Canal de Briare and the Panama Canal. A canal can be constructed by dredging a channel in the bottom of an existing lake; when the channel is complete, the lake is drained and the channel becom