Misplaced Pages

#35964

113-560: A narrowboat is a particular type of canal boat , built to fit the narrow locks of the United Kingdom . The UK's canal system provided a nationwide transport network during the Industrial Revolution , but with the advent of the railways, commercial canal traffic gradually diminished and the last regular long-distance transportation of goods by canal had virtually disappeared by 1970. However, some commercial traffic continued. From

226-438: A caisson ) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. A pound lock is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with

339-407: A British canal boat of traditional long, narrow design, steered with a tiller; spec. one not exceeding 7 feet (approx. 2.1 metres) in width or 72 feet (approx. 21.9 metres) in length The narrowboats were initially also known as barges, and the new canals were constructed with an adjacent towpath along which draft horses walked, towing the barges. These types of canal craft are so specific that on

452-451: A Mr Arthur Atkins. While the practice declined as commercial use of the canals dwindled, it has seen something of a revival in recent times with the emergence of leisure boating. Narrowboat decoration with roses and castle themes are a common sight on today's canals, although these may utilise cheaper printed vinyl transfers in place of the traditional craft of hand-painted designs. The number of licensed boats on canals and rivers managed by

565-474: A barge has given rise to the saying "I wouldn't touch that [subject/thing] with a barge pole." In the United States a barge was not a sailing vessel by the end of the 19th century. Indeed, barges were often created by cutting down ( razeeing ) sailing vessels. In New York this was an accepted meaning of the term barge. The somewhat smaller scow was built as such, but the scow also had its sailing counterpart

678-478: A boat and get afloat. The first narrow boats played a key part in the economic changes of the British Industrial Revolution . They were wooden boats drawn by a horse walking on the canal towpath led by a crew member, often a child. Narrow boats were chiefly designed for carrying cargo, though some packet boats carried passengers, luggage, mail and parcels. The first canals to feature locks in

791-528: A broad canal for more than one boat to be in a staircase at the same time, but managing this without waste of water requires expertise. On English canals, a staircase of more than two chambers is usually staffed: the lockkeepers at Bingley (looking after both the "5-rise" and the "3-rise") ensure that there are no untoward events and that boats are moved through as speedily and efficiently as possible. Such expertise permits miracles of boat balletics: boats travelling in opposite directions can pass each other halfway up

904-720: A certain amount of "shoehorning") lie diagonally. Some locks on isolated waterways are as short as 40 feet (12.19 m). Where it was possible to avoid going through locks, narrow boats were sometimes built a little larger. Wharf boats or more usually 'Amptons, operated on the Wolverhampton level of the Birmingham Canal Navigations and were up to 89 feet in length and 7 foot 10.5 inches wide. Hire fleets on British canals usually consist of narrow boats in varied lengths from 30 feet (9.14 m) upwards, to allow parties of different numbers or varying budgets to be able to hire

1017-447: A dumb barge. In Europe, a Dumb barge is: An inland waterway transport freight vessel designed to be towed which does not have its own means of mechanical propulsion . In America, a barge is generally pushed. Barges are used today for transporting low-value bulk items, as the cost of hauling goods that way is very low and for larger project cargo, such as offshore wind turbine blades. Barges are also used for very heavy or bulky items;

1130-597: A faithful imitation (false "rivets", and copies of traditional paintwork) through "interpretation" (clean lines and simplified paintwork) through to a free-style approach which does not try to pretend in any way that this is a traditional boat. They are owned by individuals, shared by a group of friends (or by a more formally organised syndicate), rented out by holiday firms, or used as cruising hotels. A few boats are lived on permanently: either based in one place (though long-term moorings for residential narrowboats are currently very difficult to find) or continuously moving around

1243-426: A flight of locks is simply a series of locks in close-enough proximity to be identified as a single group. For many reasons, a flight of locks is preferable to the same number of locks spread more widely: crews are put ashore and picked up once, rather than multiple times; transition involves a concentrated burst of effort, rather than a continually interrupted journey; a lock keeper may be stationed to help crews through

SECTION 10

#1733085232036

1356-499: A horse walking on the canal towpath led by a crew member. Horses were gradually replaced by steam and then diesel engines. By the end of the 19th century it was common practice to paint roses and castles on narrowboats and their fixtures and fittings. This tradition has continued into the 21st century, but not all narrowboats have such decorations. Modern narrowboats are used for holidays, weekend breaks, touring, or as permanent or part-time residences. Usually, they have steel hulls and

1469-495: A large open deck between counter and rear doors, protected by a taffrail (railing), perhaps with built-in seating, around back and sides. The large rear deck provides a good al fresco dining area or social space, allowing people to congregate on deck in good weather and the summer holiday season. In winter (or less than perfect weather of summer) the steerer may be unprotected from the elements. The lack of an enclosed engine room means that engine heat does not contribute to keeping

1582-480: A lock is simple. For instance, if a boat travelling downstream finds the lock already full of water: If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled. For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper level. The whole operation will usually take between 10 and 20 minutes, depending on

1695-523: A lock, and the position of the forward edge of the cill is usually marked on the lock side by a white line. The edge of the cill is usually curved, protruding less in the center than at the edges. In some locks, there is a piece of oak about 9 in (23 cm) thick which protects the solid part of the lock cill. On the Oxford Canal it is called a babbie; on the Grand Union Canal it is referred to as

1808-423: A major advantage that the engine is located entirely outside the living space. In this configuration also, it is common to find that the engine bay contains batteries, isolator switching, fuel tanks and seldom-used kit, spares and equipment. A so-called "pram cover" can be fitted to a cruiser stern. Named after a baby's pram , this usually consists of a cloth cover on a folding metal frame. When erected, it encloses

1921-486: A maximum of 6 feet 10 inches (2.08 m) wide to guarantee easy passage throughout the complete system. Because of their slenderness, some narrowboats seem very long. The maximum length is about 72 feet (21.95 m), which matches the length of the longest locks on the system. Modern narrowboats tend to be shorter, to permit cruising anywhere on the connected network of British canals — including on canals built for wider, but shorter, boats. The shortest lock on

2034-560: A pilot for these hazardous areas, and temporary modifications to improve seaworthiness such as waterproof coverings for bow doors and air vents close to the waterline. Some intrepid boaters have crossed the English Channel in a narrowboat. In all cases beyond inland use, familiarity with coastal safety such as: is strongly recommended. Barge "Barge" is attested from 1300, from Old French barge , from Vulgar Latin barga . The word originally could refer to any small boat;

2147-429: A refurbished, slow-revving, vintage semi-diesel engine . There are some steam-driven narrow boats such as the ex- Fellows Morton & Clayton steamer President . By the end of the 19th century it was common practice to paint roses and castles on narrow boats and their fixtures and fittings. Common sites include the doors to the cabin, the water can or barrel and the side of the boat along with ornate lettering giving

2260-611: A single gate was known as a flash lock . Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. They replaced earlier double slipways that had caused trouble and are mentioned by the Chinese polymath Shen Kuo (1031–1095) in his book Dream Pool Essays (published in 1088), and fully described in

2373-431: A single mast with sails. Barge and lighter were used indiscriminately. A local distinction was that any flat that was not propelled by steam was a barge, although it might be a sailing flat. The term Dumb barge was probably taken into use to end the confusion. The term Dumb barge surfaced in the early nineteenth century. It first denoted the use of a barge as a mooring platform in a fixed place. As it went up and down with

SECTION 20

#1733085232036

2486-573: A small number of steel narrowboats dispense with the need for a rear steering deck entirely, by imitating some river cruisers in providing wheel steering from a central cockpit, most narrowboats' steering is by a tiller on the stern. There are three major configurations for the stern: traditional stern , cruiser stern and semi-traditional stern . The narrowboat (one word) definition in the Oxford English Dictionary is: A British canal boat of traditional long, narrow design, steered with

2599-480: A staircase lock can be used as an emergency dry dock). To avoid these mishaps, it is usual to have the whole staircase empty before starting to descend, or full before starting to ascend, apart from the initial chamber. One striking difference in using a staircase of either type (compared with a single lock, or a flight) is the best sequence for letting boats through. In a single lock (or a flight with room for boats to pass) boats should ideally alternate in direction. In

2712-404: A staircase, however, it is quicker for a boat to follow a previous one going in the same direction. Partly for this reason staircase locks such as Grindley Brook, Foxton, Watford and Bratch are supervised by lockkeepers, at least during the main cruising season, they normally try to alternate as many boats up, followed by down as there are chambers in the flight. As with a flight, it is possible on

2825-703: A steel superstructure, but when they were first being developed for leisure use in the 1970s glass reinforced plastic (fibre-glass) or timber was often used above gunwale height. Newer narrowboats, say post 1990, are usually powered by modern diesel engines and may be fitted inside to a high standard. There will be at least 6 feet (1.8 m) internal headroom and often or usually similar domestic facilities as land homes: central heating, flush toilets, shower or even bath, four-ring hobs , oven, grill, microwave oven, and refrigerator; some may have satellite television and mobile broadband, using 4G or LTE technology. Externally, their resemblance to traditional boats can vary from

2938-467: A steel superstructure. The hull's flat base is usually 10 mm thick, the hull sides 6 mm or 8 mm, the cabin sides 6 mm, and the roof 4 mm or 6 mm. The numbers of boats have been rising, with the number of licensed boats (not all of them narrowboats) on canals and rivers managed by the Canal & River Trust (CRT) estimated at 27,000 in 2006; by 2019, this had risen to 34,367. Although

3051-610: A tiller; spec. one not exceeding 7 feet (approx. 2.1 metres) in width or 72 feet (approx. 21.9 metres) in length Earlier quotations listed in the Oxford English Dictionary use the term "narrow boat", with the most recent, a quotation from an advertisement in Canal Boat & Inland Waterways in 1998, uses "narrowboat". The single word "narrowboat" has been adopted by authorities such as the Canal and River Trust, Scottish Canals and

3164-400: A tunnel, which when descending does not become visible until the chamber is nearly empty. A pound is the level stretch of water between two locks (also known as a reach ). The cill , also spelled sill , is a narrow horizontal ledge protruding a short way into the chamber from below the upper gates. Allowing the rear of the boat to "hang" on the cill is the main danger when descending

3277-451: A typical American barge measures 195 by 35 feet (59.4 m × 10.7 m), and can carry up to about 1,500 short tons (1,400 t) of cargo. The most common European barges measure 251 by 37 feet (76.5 m × 11.4 m) and can carry up to about 2,450 tonnes (2,700 short tons). As an example, on June 26, 2006, in the US a 565-short-ton (513 t) catalytic cracking unit reactor

3390-626: A warm stove, a steaming kettle, gleaming brass, fancy lace, painted housewares and decorated plates. Such descriptions rarely consider the actual comfort of a (sometimes large) family, working brutally hard and long days, sleeping in one tiny cabin. However many shore-bound workers endured harder indoor trades in less healthy conditions and in worse accommodation, where the family was separated for long hours rather than being together all day. The lifestyle afloat, by definition itinerant, made it impossible for children to attend school. Most boat people were effectively illiterate and ostracised by those living "on

3503-426: Is a normal top gate, and the intermediate gates are all as tall as the bottom gate). As there is no intermediate pound, a chamber can only be filled by emptying the one above, or emptied by filling the one below: thus the whole staircase has to be full of water (except for the bottom chamber) before a boat starts to ascend, or empty (except for the top chamber) before a boat starts to descend. In an "apparent" staircase

Narrowboat - Misplaced Pages Continue

3616-460: Is an unpowered boat traditionally with a larger rudder with (usually) a wooden tiller (known as an elum , a corruption of helm ) as the steering does not benefit from the force of water generated by the propeller so the rudder must be of a larger area. The tiller is usually removed and reversed in the rudder-post socket to get it out of the way when moored. A few butty boats have been converted into powered narrowboats like NB Sirius . The term butty

3729-488: Is by tiller, as was the case on all working narrow boats. The steerer stands at the stern of the boat, aft of the hatchway and/or rear doors at the top of the steps up from the cabin. The steering area comes in three basic types, each meeting different needs of maximising internal space; having a more traditional appearance; having a big enough rear deck for everyone to enjoy summer weather or long evenings; or protection outside in bad weather. Each type has its advocates. However,

3842-619: Is certainly a similarity in style and a geographical overlap, but no solid proof of a link. There are similar styles of folk art in Scandinavia , Germany, Turkey and Bangladesh . In the 18th century, similar Dutch Hindeloopen paintwork would only have been a sailing barge journey away from the Thames. There is also an article in the Midland Daily Telegraph of 22 July 1914 that credits the practice of painting of water cans, at least, to

3955-418: Is derived from the dialect word buddy, meaning companion. While the vast majority of narrowboats have tiller steering at the stern, a small number of steel narrowboats dispense with the need for a rear steering deck entirely, by imitating some river cruisers in providing wheel steering from a central cockpit. This layout has the advantage (as have many Dutch barges ) of enabling an aft cabin to be separate from

4068-515: Is generally 72 feet (21.95 m), as anything longer will be unable to navigate much of the British canal network, because the nominal maximum length of locks is 75 feet (22.86 m). Some locks are shorter than 72 feet (21.95 m), so to access the entire canal network the maximum length is 57 feet (17.37 m). The first narrow boats played a key role in the economic changes of the British Industrial Revolution . They were wooden boats drawn by

4181-443: Is only a staircase if successive lock chambers share a gate (i.e. do not have separate top and bottom gates with a pound between them). Most flights are not staircases, because each chamber is a separate lock (with its own upper and lower gates), there is a navigable pound (however short) between each pair of locks, and the locks are operated in the conventional way. However, some flights include (or consist entirely of) staircases. On

4294-493: Is the Bibby Stockholm . Canal lock A lock is a device used for raising and lowering boats , ships and other watercraft between stretches of water of different levels on river and canal waterways . The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock , a boat lift , or on a canal inclined plane , it is the chamber itself (usually then called

4407-559: Is the change in water-level in the lock. The two deepest locks on the English canal system are Bath deep lock on the Kennet and Avon Canal and Tuel Lane Lock on the Rochdale Canal , which both have a rise of nearly 20 feet (6.1 m). Both locks are amalgamations of two separate locks, which were combined when the canals were restored to accommodate changes in road crossings. By comparison,

4520-846: The Bollène lock on the River Rhône has a fall of at least 23 m (75 ft), the Leerstetten, Eckersmühlen and Hilpoltstein locks on the Rhine–Main–Danube Canal have a fall of 24.67 m (80.9 ft), each and the Oskemen Lock on the Irtysh River in Kazakhstan has a drop of 42 m (138 ft). The natural extension of the flash lock , or staunch, was to provide an upper gate (or pair of gates) to form an intermediate "pound" which

4633-533: The Canal & River Trust (CRT), a charitable trust, formerly British Waterways, was estimated at 27,000 in 2006. By 2014 this number had risen to over 30,000. There were perhaps another 5,000 unlicensed boats kept in private moorings or on other waterways in 2006. Most boats on CRT waterways are steel (or occasionally, aluminium) cruisers popularly referred to as narrowboats. Modern leisure narrowboats are used for holidays, weekend breaks, touring, as permanent or part-time residences. Usually, they have steel hulls and

Narrowboat - Misplaced Pages Continue

4746-509: The Chinese historical text Song Shi (compiled in 1345): The distance between the two locks was rather more than 50 paces, and the whole space was covered with a great roof like a shed. The gates were 'hanging gates'; when they were closed the water accumulated like a tide until the required level was reached, and then when the time came it was allowed to flow out. The water level could differ by 4 or 5 feet (1.2 or 1.5 m) at each lock and in

4859-532: The Grand Canal the level was raised in this way by 138 feet (42 m). In medieval Europe a sort of pound lock was built in 1373 at Vreeswijk , Netherlands. This pound lock serviced many ships at once in a large basin . Yet the first true pound lock was built in 1396 at Damme near Bruges , Belgium. The Italian Bertola da Novate (c. 1410–1475) constructed 18 pound locks on the Naviglio di Bereguardo (part of

4972-470: The Grand Union . Operation of a staircase is more involved than a flight. Inexperienced boaters may find operating staircase locks difficult. The key worries (apart from simply being paralysed with indecision) are either sending down more water than the lower chambers can cope with (flooding the towpath, or sending a wave along the canal) or completely emptying an intermediate chamber (although this shows that

5085-549: The Milan canal system sponsored by Francesco Sforza ) between 1452 and 1458. In Ancient Egypt, the river-locks was probably part of the Canal of the Pharaohs : Ptolemy II is credited by some for being the first to solve the problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC. All pound locks have three elements: The principle of operating

5198-642: The River Irwell there was reference to barges passing below Barton Aqueduct with their mast and sails standing. Early barges on the Thames were called west country barges. In the United Kingdom the word barge had many meanings by the 1890s, and these varied locally. On the Mersey a barge was called a 'Flat', on the Thames a Lighter or barge, and on the Humber a 'Keel'. A Lighter had neither mast nor rigging. A keel did have

5311-581: The Song dynasty (960–1279 CE). The Songshi or History of the Song Dynasty, volume 307, biography 66, records how Qiao Weiyue, a high-ranking tax administrator, was frustrated at the frequent losses incurred when his grain barges were wrecked on the West River near Huai'an in Jiangsu . The soldiers at one double slipway, he discovered, had plotted with bandits to wreck heavy imperial barges so that they could steal

5424-423: The narrowboat , which usually had a beam a couple of inches less to allow for clearance e.g. 6 feet 10 inches (2.08 m) . It was soon realized that the narrow locks were too limiting, and later locks were therefore doubled in width to 14 feet (4.3 m). This led to the development of the widebeam canal boat. The narrowboat (one word) definition in the Oxford English Dictionary is: Narrowboat:

5537-511: The 1970s onward narrowboats were gradually being converted into permanent residences or as holiday lettings. Currently, about 8,580 narrowboats are registered as 'permanent homes' on Britain's waterway system and represent a growing alternative community living on semi-permanent moorings or continuously cruising. For any boat to enter a narrow lock, it must be under 7 feet (2.13 m) wide, so most narrowboats are nominally 6 feet 10 inches (2.08 m) wide. A narrowboat's maximum length

5650-414: The British canal system the term 'barge' is no longer used to describe narrowboats and widebeams . Narrowboats and widebeams are still seen on canals, mostly for leisure cruising, and now engine-powered. The people who moved barges were known as lightermen . Poles are used on barges to fend off other nearby vessels or a wharf. These are often called 'pike poles'. The long pole used to maneuver or propel

5763-510: The British river system and larger waterways, the Thames sailing barge , and Dutch barge and unspecified other styles of barge, are still known as barges. The term Dutch barge is nowadays often used to refer to an accommodation ship, but originally refers to the slightly larger Dutch version of the Thames sailing barge. During the Industrial Revolution , a substantial network of canals was developed in Great Britain from 1750 onward. Whilst

SECTION 50

#1733085232036

5876-664: The Carrapatelo and Valeira locks on the Douro river in Portugal, which are 279 feet (85 m) long and 39 feet (12 m) wide, have maximum lifts of 115 and 108 feet (35 and 33 m) respectively. The two Ardnacrusha locks near Limerick on the Shannon navigation in Ireland have a rise of 100 feet (30 m). The upper chamber rises 60 feet (18 m) and is connected to the lower chamber by

5989-460: The Chesapeake and Ohio Canal, the lockkeepers were required to remove the windlasses from all lock paddles at night, to prevent unauthorized use. A swell was caused by opening suddenly the paddle valves in the lock gates, or when emptying a lock. To help boats traveling downstream exit a lock, the locksman would sometimes open the paddles to create a swell, which would help "flush" the boat out of

6102-552: The Grand Union (Leicester) Canal, the Watford flight consists of a four-chamber staircase and three separate locks; and the Foxton flight consists entirely of two adjacent 5-chamber staircases. Where a very steep gradient has to be climbed, a lock staircase is used. There are two types of staircase, "real" and "apparent". A "real" staircase can be thought of as a "compressed" flight, where

6215-654: The Lee & Stort Navigation). A few people are doing their best in the 21st century to keep the tradition of canal-borne cargo-carrying alive, mostly by "one-off" deliveries rather than regular runs, or by selling goods such as coal to other boaters. Enthusiasts remain dedicated to restoring the remaining old narrow boats, often as members of the Historic Narrow Boat Owners Club. There are many replicas, such as Hadar , ornately painted with traditional designs, usually of roses and castles. Boats not horse-drawn may have

6328-470: The advent of canals in Britain. The sides of the turf-lock are sloping so, when full, the lock is quite wide. Consequently, this type of lock needs more water to operate than vertical-sided brick- or stone-walled locks. On British canals and waterways most turf-sided locks have been subsequently rebuilt in brick or stone, and so only a few good examples survive, such as at Garston Lock , and Monkey Marsh Lock , on

6441-451: The art form must have existed by this date. For some time, a popular suggestion was that it had some form of Romani origin; however, there does not appear to be a significant link between the Romani and boating communities. Other suggestions include transfer of styles from the clock-making industry (in particular the decoration on the face), the japanning industry or the pottery industry. There

6554-443: The authoritative magazine Waterways World to refer to all boats built in the style and tradition of commercial boats that were able to fit in the narrow canal locks. Although some narrow boats are built to a design based on river barges and many conform to the strict definition of the term, it is incorrect to refer to a narrowboat (or narrow boat) as a widebeam or as a barge , both of which are definable by their greater width. In

6667-402: The bank", who considered themselves superior. As steam and diesel progressively replaced the tow-horse in the early years of the 20th century, it became possible to move even more cargo with fewer hands by towing a second, un-powered boat, referred to as a "butty", "buttyboat" or "butty boat". Although there was no longer a horse to maintain, the butty had to be steered while being towed. So that

6780-573: The boat entered the lock. Pulling on the rope slowed the boat, due to the friction of the rope against the post. A rope 2 + 1 ⁄ 2 inches (6.4 cm) in diameter and about 60 feet (18 meters) long was typically used on the Erie Canal to snub a boat in a lock. One incident, which took place in June 1873 on the Chesapeake and Ohio Canal, involved the boat the Henry C. Flagg and its drunk captain. That boat

6893-407: The boat warm and there may be "wasted" space above the deck area. A "cruiser" stern allows the engine to be located under the deck, rather than in the body of the boat. Although this may make access to the engine more of a nuisance (due to weather considerations) the whole deck can usually be lifted off in whole or in sections, allowing the operative to stand inside the engine bay, the cruiser stern has

SECTION 60

#1733085232036

7006-469: The boat's name and owner. This tradition did not happen in all regions, the Chesterfield Canal being one waterway where narrow boats never bore such decorations. The origin of the roses and castles found on canal boats is unclear. The first written reference to them appears to be in an 1858 edition of the magazine Household Words in one of a series of articles titled "On the Canal", showing that

7119-567: The boats harder, faster and further, partly to keep families together. As late as 1858, a Household Words article states that "the Grand Junction Canal company did not allow the boatmen's families on board." The crew of the non-stopping (" fly ") boat in the article (skipper, two crew and a "youth") is said to be typical. The rear portion of the boat became the "boatman's cabin", familiar from picture postcards and museums, famous for its space-saving ingenuity and interior made attractive by

7232-463: The bottom cill at all but the higher tides – the new bottom chamber rises just far enough to get the boat over the original lock cill. In China, the recently completed Three Gorges Dam includes a double five-step staircase for large ships, and a ship lift for vessels of less than 3000 metric tons. Examples of "apparent" staircases are Foxton Locks and Watford Locks on the Leicester Branch of

7345-453: The boundaries are not fixed, and some boats blur the categories as new designers try out different arrangements and combinations. Many modern canal boats retain the traditional layout of a small open, unguarded "counter" or deck behind the rear doors from which the crew can step onto land. It is possible to steer from the counter, but this is not very safe, with the propeller churning below only one missed step away. The "tiller extension" allows

7458-501: The butty boatman could lengthen or shorten towline as needed, the towline wasn't tied-off on the bow, instead travelled over the buttyboat through permanent running blocks on stands or retractable middle masts and managed in the stern. On a wide canal, such as the Grand Union Canal , the pair could be roped side-to-side ("breasted up") and handled as a unit through working locks. Cargo-carrying by narrow boat diminished from 1945 and

7571-617: The canal would cause frequent interruptions of the heavy road traffic. It can be emptied by pumping – but as this uses a lot of electricity the method used when water supplies are adequate is to drain the lock to a nearby burn . In 2016 the Kieldrecht Lock in the Port of Antwerp in Belgium took over the title of the world's largest lock from the Berendrecht Lock in the same port and still has

7684-538: The chambers so that some water from the emptying chamber helps to fill the other. This facility has long been withdrawn on the English canals, although the disused paddle gear can sometimes be seen, as at Hillmorton on the Oxford Canal . Elsewhere they are still in use; a pair of twinned locks was opened in 2014 on the Dortmund–Ems Canal near Münster , Germany. The once-famous staircase at Lockport, New York ,

7797-617: The chambers still have common gates, but the water does not pass directly from one chamber to the next, going instead via side ponds. This means it is not necessary to ensure that the flight is full or empty before starting. Examples of famous "real" staircases in England are Bingley and Grindley Brook . Two-rise staircases are more common: Snakeholme Lock and Struncheon Hill Lock on the Driffield Navigation were converted to staircase locks after low water levels hindered navigation over

7910-404: The chance of a boat finding a lock set in its favour. There can also be water savings: the locks may be of different sizes, so that a small boat does not need to empty a large lock; or each lock may be able to act as a side pond (water-saving basin) for the other. In this latter case, the word used is usually "twinned": here indicating the possibility of saving water by synchronising the operation of

8023-492: The cill bumper. Some canal operation authorities, primarily in the United States and Canada, call the ledge a miter sill (mitre sill in Canada). Gates are the watertight doors which seal off the chamber from the upper and lower pounds. Each end of the chamber is equipped with a gate, or pair of half-gates, traditionally made of oak or elm but now usually made of steel ). The most common arrangement, usually called miter gates ,

8136-514: The concept has been suggested in a number of cases, the only example in the world of a drop lock that has actually been constructed is at Dalmuir on the Forth and Clyde Canal in Scotland. This lock, of the single-chamber type, was incorporated during the restoration of the canal, to allow the replacement of a swing bridge (on a busy A road) by a fixed bridge, and so answer criticisms that the restoration of

8249-576: The context of British inland waterways, a barge is usually a much wider, cargo-carrying boat or a modern boat modelled on one, certainly more than 7 feet (2.13 m) wide. Another historic term for a narrow boat is a long boat , which has been noted in the Midlands and especially on the River Severn and connecting waterways to Birmingham. Usage has not quite settled as regards (a) boats based on narrowboat design, but too wide for narrow canals; or (b) boats

8362-433: The cruiser stern, allowing more comfortable operation of the boat in cold or inclement weather. A semi-traditional stern is a compromise to gain some of the "social" benefits of a cruiser stern, while retaining a more traditional design and providing some protection for the steerer in bad weather or in cooler seasons. As with the cruiser stern, the deck is extended back from the hatch and rear doors, but in this case most of

8475-473: The deck is protected at the sides by walls which extend back from the cabin sides – giving a more sheltered area for the steerer and companions, usually with lockers to sit on. The engine is located under the deck, much like a cruiser, again allowing a separation between the cabin and the engine bay, with the steps down to the cabin being located past the false sides of the "semi-trad" social area. Semi-trad sterns can also be fitted with pram covers. A butty boat

8588-502: The final port to the refinery. The Transportation Institute at Texas A&M found that inland barge transportation in the US produces far fewer emissions of carbon dioxide for each ton of cargo moved compared to transport by truck or rail. According to the study, transporting cargo by barge produces 43% less greenhouse gas emissions than rail and more than 800% less than trucks. Environmentalists claim that in areas where barges, tugboats and towboats idle may produce more emissions like in

8701-425: The flight quickly; and where water is in short supply, a single pump can recycle water to the top of the whole flight. The need for a flight may be determined purely by the lie of the land, but it is possible to group locks purposely into flights by using cuttings or embankments to "postpone" the height change. Examples: Caen Hill locks, Devizes . "Flight" is not synonymous with "Staircase" (see below). A set of locks

8814-512: The form of the now-disused Écluse des Lorraines , connecting the Canal latéral à la Loire with the River Allier . A drop lock can consist of two conventional lock chambers leading to a sump pound, or a single long chamber incorporating the sump – although the term properly applies only to the second case. As the pounds at either end of the structure are at the same height, the lock can only be emptied either by allowing water to run to waste from

8927-511: The forward accommodation. Narrowboats are "Category D" boats under the Recreational Craft Directive , intended only for navigating inland - rivers, canals and small lakes - but under the professional supervision of a suitable local pilot , limited coastal passages linking inland waterways, such as along the tidal Severn Estuary between Bristol and Sharpness , can also be safely made in calm weather. Insurers will often require

9040-464: The hatchway edge, a high vantage point giving good all-round visibility. On trad boats, the bow "well-deck" forms the main outside viewing area, because the traditional stern is not large enough for anyone other than the steerer to stand on safely. Internally, trads may have an engine room forward of a traditional "boatman's cabin", or an enclosed engine tucked away out of sight and the increased living space this brings. The name for this style arises from

9153-414: The intermediate pounds have disappeared, and the upper gate of one lock is also the lower gate of the one above it. However, it is incorrect to use the terms staircase and flight interchangeably: because of the absence of intermediate pounds, operating a staircase is very different from operating a flight. It can be more useful to think of a staircase as a single lock with intermediate levels (the top gate

9266-414: The large open rear deck resembling that of the large rear cockpits common on glass-fibre ( glass-reinforced plastic or GRP) river cruisers which in turn derives from elliptical sterns used on cruisers and larger warships in the 20th century. At the stern, a "cruiser" narrowboat looks very different from traditional boats: the hatch and rear doors are considerably further forward than on a "trad", creating

9379-414: The largest of these could accommodate ocean-going vessels e.g the later Manchester Ship Canal , a complex network of smaller canals was also developed. These smaller canals had locks, bridges and tunnels that were at minimum only 7 feet (2.1 m) wide at the waterline . On wider sections, standard barges and other vessels could trade, but full access to the network necessitated the parallel development of

9492-421: The last regular long-distance traffic disappeared in 1970. However, some traffic continued into the 1980s and beyond. Two million tonnes of aggregate were carried on the Grand Union (River Soar) between 1976 and 1996, latterly using wide beam barges. Aggregate continues to be carried between Denham and West Drayton on the (wide) Grand Union Canal and on the tidal estuary of Bow Creek (which is the eventual outflow of

9605-403: The lock gates could be replaced and the boat removed from the lock. To economise, especially where good stone would be prohibitively expensive or difficult to obtain, composite locks were made, i.e. they were constructed using rubble or inferior stone, dressing the inside walls of the lock with wood, so as not to abrade the boats. This was done, for instance, on the Chesapeake and Ohio Canal with

9718-403: The lock. A boatsman might ask for a back swell, that is, to open and shut the paddles a few times to create some waves, to help him get off the bank where he was stuck. If boats ran aground (from being overloaded) they sometimes asked passing crews to tell the upstream lock to give them an extra heavy swell, which consisted of opening all the paddles on the lock gate, creating a surge that affected

9831-578: The locks and dams of the Mississippi River. Self-propelled barges may be used for traveling downstream or upstream in placid waters; they are operated as an unpowered barge, with the assistance of a tugboat, when traveling upstream in faster waters. Canal barges are usually made for the particular canal in which they will operate. Unpowered vessels—barges—may be used for other purposes, such as large accommodation vessels , towed to where they are needed and stationed there as long as necessary. An example

9944-734: The locks near the Paw Paw Tunnel . and also the Chenango Canal On large modern canals, especially very large ones such as ship canals , the gates and paddles are too large to be hand operated, and are operated by hydraulic or electrical equipment. On the Caledonian Canal the lock gates were operated by man-powered capstans , one connected by chains to open the gate and another to draw it closed. By 1968 these had been replaced by hydraulic power acting through steel rams. The construction of locks (or weirs and dams) on rivers obstructs

10057-495: The main network is Salterhebble Middle Lock on the Calder and Hebble Navigation , at about 56 feet (17.07 m) long. However, the C&;H is a wide canal, so the lock is about 14 feet 2 inches (4.32 m) wide. This makes the largest "go-anywhere-on-the-network" narrowboat slightly longer (about 58 feet or 17.68 metres) than the straight length of the lock, because it can (with

10170-606: The modern meaning arose around 1480. Bark "small ship" is attested from 1420, from Old French barque , from Vulgar Latin barca (400 AD). The more precise meaning of Barque as "three-masted sailing vessel" arose in the 17th century, and often takes the French spelling for disambiguation. Both are probably derived from the Latin barica , from Greek baris "Egyptian boat", from Coptic bari "small boat", hieroglyphic Egyptian and similar ba-y-r for "basket-shaped boat". By extension,

10283-484: The network (perhaps with a fixed location for the coldest months, when many stretches of canal are closed by repair works or "stoppages"). A support infrastructure has developed to provide services to the leisure boats, with some narrowboats being used as platforms to provide services such as engine maintenance and boat surveys; while some others are used as fuel tenders, that provide diesel , solid fuel (coal and wood) and Calor Gas . On almost all narrowboats steering

10396-656: The new canal was low. This resulted in a sequential pair of locks, with gates pointing in opposite directions: one example was at Hall Green near Kidsgrove , where the southern terminus of the Macclesfield Canal joined the Hall Green Branch of the earlier Trent and Mersey Canal . The four gate stop lock near Kings Norton Junction, between the Stratford-upon-Avon Canal and the Worcester and Birmingham Canal

10509-668: The now standard size were the canals designed by James Brindley and approved by Parliament in 1766, including the Staffordshire and Worcestershire Canal and Trent and Mersey Canal . Although construction took many years, the lock size became standard for many canal building projects. Boatmen's families originally lived ashore, but in the 1830s as canals started to suffer competition from the burgeoning railway system, families (especially those of independent single boat owner/skippers) began to live on board, partly because they could no longer afford rents, partly to provide extra hands to work

10622-528: The passage of fish. Some fish such as lampreys, trout and salmon go upstream to spawn. Measures such as a fish ladder are often taken to counteract this. Navigation locks have also potential to be operated as fishways to provide increased access for a range of biota. Locks can be built side by side on the same waterway. This is variously called doubling , pairing , or twinning . The Panama Canal has three sets of double locks. Doubling gives advantages in speed, avoiding hold-ups at busy times and increasing

10735-517: The sailing scow. The innovation that led to the modern barge was the use of iron barges towed by a steam tugboat. These were first used to transport grain and other bulk products. From about 1840 to 1870 the towed iron barge was quickly introduced on the Rhine, Danube, Don, Dniester , and rivers in Egypt, India and Australia. Many of these barges were built in Great Britain. Nowadays 'barge' generally refers to

10848-542: The same width as narrowboats but based on other types of boat. Narrowboats may have ship prefix NB . The key distinguishing feature of a narrowboat is its width, which must be less than 7 feet (2.13 m) wide to navigate British narrow canals. Some old boats are very close to this limit (often built 7 feet 1 + 1 ⁄ 2  inches or 2.17 metres or slightly wider), and can have trouble using certain narrow locks whose width has been reduced over time because of subsidence . Modern boats are usually produced to

10961-469: The size of the lock and whether the water in the lock was originally set at the boat's level. Boaters approaching a lock are usually pleased to meet another boat coming towards them, because this boat will have just exited the lock on their level and therefore set the lock in their favour – saving about 5 to 10 minutes. However, this is not true for staircase locks, where it is quicker for boats to go through in convoy, and it also uses less water. The rise

11074-407: The spilled grain. In 984 Qiao installed a pair of sluice-gates two hundred and fifty feet apart, the entire structure roofed over like a building. By siting two staunch gates so close to one another, Qiao had created a short stretch of canal, effectively a pound-lock, filled from the canal above by raising individual wooden baulks in the top gate and emptied into the canal below by lowering baulks in

11187-411: The staircase by moving sideways around each other; or at peak times, one can have all the chambers full simultaneously with boats travelling in the same direction. When variable conditions meant that a higher water level in the new canal could not be guaranteed, then the older company would also build a stop lock (under its own control, with gates pointing towards its own canal) which could be closed when

11300-433: The steerer to stand in safety on the top step, forward of the rear doors. (On a working boat, this step would have been over the top of the coal box). On cold days, the steerer can even close the rear doors behind themselves, and be in relative comfort, their lower body in the warmth of the cabin, and only their upper body emerging from the hatchway and exposed to the elements. In good weather, many trad-stern steerers sit up on

11413-413: The sump to a lower stream or drain, or (less wastefully) by pumping water back up to the canal. Particularly in the two-chamber type, there would be a need for a bypass culvert, to allow water to move along the interrupted pound and so supply locks further down the canal. In the case of the single-chamber type, this can be achieved by keeping the lock full and leaving the gates open while not in use. While

11526-563: The term "embark" literally means to board the kind of boat called a "barque". In Great Britain a merchant barge was originally a flat bottomed merchant vessel for use on navigable rivers. Most of these barges had sails. For traffic on the River Severn the barge was described thus: "The lesser sort are called barges and frigates, being from forty to sixty feet in length, having a single mast and square sail, and carrying from twenty to forty tons burthen." The larger vessels were called trows. On

11639-578: The tides, it made a very convenient mooring place for steam vessels. Within a few decades, the term dumb barge evolved, and came to mean: 'a vessel propelled by oars only'. By the 1890s Dumb barge was still used only on the Thames. By 1880 barges on British rivers and canals were often towed by steam tugboats. On the Thames, many dumb barges still relied on their poles, oars and the tide. Others dumb barges made use of about 50 tugboats to tow them to their destinations. While many coal barges were towed, many dumb barges that handled single parcels were not. On

11752-488: The title for largest volume. In 2022 the IJmuiden sea lock serving the Port of Amsterdam became the world's largest lock by surface area. The lock is 500 m (1,600 ft) long, 70 m (230 ft) wide and has sliding lock gates creating a usable depth of 18 m (59 ft). The size of locks cannot be compared without considering the difference in water level that they are designed to operate under. For example,

11865-400: The top gate and raising ones in the lower. A turf-sided lock is an early form of canal lock design that uses earth banks to form the lock chamber, subsequently attracting grasses and other vegetation, instead of the now more familiar and widespread brick, stone, or concrete lock wall constructions. This early lock design was most often used on river navigations in the early 18th century before

11978-416: The water on the pound above sometimes causing boats to run aground. In addition, it raised the water level on the pound below, causing some boats to strike bridges or get stuck. On horse-drawn and mule-drawn canals, snubbing posts were used to slow or stop a boat in the lock. A 200-ton boat moving at a few miles an hour could destroy the lock gate. To prevent this, a rope was wound around the snubbing post as

12091-453: The whole pound below. On the Erie Canal, some loaded boats needed a swell to get out of the lock. Particularly lumber boats, being top heavy, would list to one side and get stuck in the lock, and needed a swell to get them out. Some lockkeepers would give a swell to anyone to help them on the way, but some would ask for money for the swell. The Erie Canal management did not like swelling for two reasons. First, it used too much water lowering

12204-456: Was all that need be emptied when a boat passed through. This type of lock, called a pound lock was known in Imperial China and ancient Europe and was used by Greek engineers in the Canal of the Pharaohs under Ptolemy II (284 to 246 BC), when engineers solved the problem of overcoming the difference in height through canal locks . Pound locks were first used in medieval China during

12317-422: Was already leaking; the crew, having partially pumped the water out, entered Lock 74, moving in front of another boat. Because they failed to snub the boat, it crashed into and knocked out the downstream gates. The outrush of water from the lock caused the upstream gates to slam shut, breaking them also, and sending a cascade of water over the boat, sinking it. This suspended navigation on the canal for 48 hours until

12430-416: Was also a doubled set of locks. Five twinned locks allowed east- and west-bound boats to climb or descend the 60 feet (18 m) Niagara Escarpment , a considerable engineering feat in the nineteenth century. While Lockport today has two large steel locks, half of the old twin stair acts as an emergency spillway and can still be seen, with the original lock gates having been restored in early 2016. Loosely,

12543-412: Was invented by Leonardo da Vinci sometime around the late 15th century. On the old Erie Canal , there was a danger of injury when operating the paddles: water, on reaching a certain position, would push the paddles with a force which could tear the windlass (or handle) out of one's hands, or if one was standing in the wrong place, could knock one into the canal, leading to injuries and drownings. On

12656-588: Was replaced in 1914 by a pair of guillotine lock gates which stopped the water flow regardless of which canal was higher. These gates have been permanently open since nationalisation. The best known example of a round lock is the Agde Round Lock on the Canal du Midi in France. This serves as a lock on the main line of the canal and allows access to the Hérault River . A second French round lock can be found in

12769-654: Was shipped by barge from the Tulsa Port of Catoosa in Oklahoma to a refinery in Pascagoula, Mississippi . Extremely large objects are normally shipped in sections and assembled after delivery, but shipping an assembled unit reduces costs and avoids reliance on construction labor at the delivery site, which in the case of the reactor was still recovering from Hurricane Katrina . Of the reactor's 700-mile (1,100 km) journey, only about 40 miles (64 km) were traveled overland, from

#35964