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89-556: The First Lift Station is a pump station in Mission, Texas , that once provided water for irrigating the crops of the early Rio Grande Valley . In 1907 John J. Conway and James W. Hoit began the Mission Canal Co. Irrigation system, which was instrumental in the early agricultural growth of the area. Here, they built the first pump station. The pump was powered by steam produced by wood-fired boilers. The chimney , which still stands at

178-424: A sewer force main if the sewage is transported some significant distance. The pumping station may be called a lift station if the pump merely discharges into a nearby gravity manhole. From here the cycle starts all over again until the sewage reaches its point of destination—usually a treatment plant. By this method, pumping stations are used to move waste to higher elevations. In the case of high sewage flows into

267-551: A well into a reservoir Used to pump drinking water from a reservoir into a water supply system. River Avon, Bristol The River Avon / ˈ eɪ v ən / is a river in the southwest of England. To distinguish it from a number of other rivers of the same name , it is often called the Bristol Avon . The name 'Avon' is loaned from an ancestor of the Welsh word afon , meaning 'river'. The Avon rises just north of

356-606: A border of the territory ruled by the Belgae . After the Roman occupation the river formed a boundary between the lands of the Hwicce (which became Mercia ) and the kingdom of Wessex . The river Avon had been navigable from Bristol to Bath during the early years of the 13th century but construction of mills on the river forced its closure. The floodplain of the Avon, on which the city centre of Bath

445-401: A chain off of the duckfoot and up the two guide rails to the maintenance (normally ground) level. Reinstalling the pumps simply reverses this process with the pump being remounted on the guide rails and lowered onto the duckfoot where the weight of the pump reseals it. As the motors are sealed and weather is not a concern, no above ground structures are required, excepting a small kiosk to contain

534-590: A concept pioneered during the Victorian era in places like The Fens in the UK. The introduction of "package pumping stations" has modernized drainage systems, allowing a compact, efficient solution for areas where gravity drainage is impractical. Water pumping stations are differentiated by their applications, such as sourcing from wells, raw water pumping, and high service pumping, each designed to meet specific demand projections and customer needs. Wastewater pumping stations, on

623-459: A dry well or pump house and usually consist only of a wet well. In this configuration, submersible sewage pumps with closely coupled electric motor are mounted within the wet well itself, submerged within the sewage. Submersible pumps are mounted on two vertical guide rails and seal onto a permanently fixed "duckfoot", which forms both a mount and also a vertical bend for the discharge pipe. For maintenance or replacement, submersible pumps are raised by

712-437: A high-level alarm indication, in the event of pump failure; and possibly a guide-rail/auto-coupling/pedestal system, to permit easy removal of pumps for maintenance. Traditional site constructed systems have the valve vault components installed in a separate structure. Having two structural components can lead to potentially serious site problems such as uneven settling between components which results in stress on, and failure of

801-409: A highest level of 2.43 metres (8 ft 0 in). At Melksham the Avon has a mean flow rate of 6.703 cubic metres per second (236.7 cu ft/s). December 2013 was the highest level recorded at Bradford on Avon when the level reached 3.42 metres (11.2 ft) with a normal range at the monitoring station being 1.01 metres (3 ft 4 in) to 1.40 metres (4 ft 7 in). At Bathford

890-458: A highest recording of 2.31 metres (7 ft 7 in) on 24 December 2013. At Keynsham the typical range is between 0.23 metres (9.1 in) and 2.09 metres (6 ft 10 in). The highest was on 25 December 2013 when it reached 5.36 metres (17.6 ft). At Netham Weir where the new cut carries the flow away from Bristol Harbour the typical range for the depth of the river is 0.15 metres (5.9 in) to 0.84 metres (2 ft 9 in) with

979-403: A large open passage so as to avoid clogging with debris or winding stringy debris onto the impeller. A four pole or six pole AC induction motor normally drives the pump. Rather than provide large open passages, some pumps, typically smaller sewage pumps, also macerate any solids within the sewage breaking them down into smaller parts which can more easily pass through the impeller. The interior of

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1068-717: A new regional body , the Wessex Water Authority. Privatisation saw responsibility for the catchment pass to the National Rivers Authority on its formation on 1 September 1989. In 1996 the authority became part of the Environment Agency . Navigation conservancy in the lower river from Avonmouth to the lock at Hotwells is the responsibility of The Bristol Port Company as both statutory and competent harbour authority. Navigation within Bristol's floating harbour

1157-457: A sewage pump station is a very dangerous place. Poisonous gases, such as methane and hydrogen sulfide , can accumulate in the wet well; an ill-equipped person entering the well would be overcome by fumes very quickly. Any entry into the wet well requires the correct confined space entry method for a hazardous environment. To minimize the need for entry, the facility is normally designed to allow pumps and other equipment to be removed from outside

1246-564: A similar flow (20.984 cubic metres per second (741.0 cu ft/s)) downstream of the weir. At the Destructor Bridge in Bath the typical height range is 0.40 metres (1 ft 4 in) to 0.81 metres (2 ft 8 in) with a high of 1.64 metres (5 ft 5 in) also in December 2013. At Saltford the range is 0.46 metres (1 ft 6 in) to 1.41 metres (4 ft 8 in) with

1335-511: A specific pump controller. RTUs are very helpful in remote monitoring of each pumping station from a centralized control room with SCADA (Supervisory Control & Data Acquisition) systems. This setup can be helpful in monitoring pump faults, levels, and other alarms and parameters, making it more efficient. A pumped-storage scheme is a type of power station for storing and producing electricity to supply high peak demands by moving water between reservoirs at different elevations. Typically, water

1424-487: Is a Grade I listed structure, and was the first canal structure to be designated as a Scheduled Ancient Monument in 1951. The stretch of river below and above the aqueduct, where it is joined by Midford Brook , has been used by rowing crews from Monkton Combe School since at least the beginning of the 1900s. It then flows past Claverton Pumping Station , which pumped water from the River Avon by Warleigh Weir into

1513-509: Is a list of those described in this encyclopedia. In the UK, during the Victorian Era , there was a fashion for public buildings to feature highly ornate architecture . Consequently, a considerable number of former pumping stations have been listed and preserved. The majority were originally steam-powered, and where the steam engines are still in situ , many of the sites have since re-opened as museum attractions. Used to pump water from

1602-407: Is available, back pumping systems may be employed. Water is extracted from the canal below the lowest lock of a flight and is pumped back to the top of the flight, ready for the next boat to pass through. Such installations are usually small. When low-lying areas of land are drained, the general method is to dig drainage ditches . However, if the area is below sea level then it is necessary to pump

1691-479: Is built into the system so that in the event that any one pump is out of service, the remaining pump or pumps will handle the designed flow. The storage volume of the wet well between the "pump on" and "pump off" settings is designed to minimize pump starts and stops, but is not so long a retention time as to allow the sewage in the wet well to go septic . Sewage pumps are almost always end-suction centrifugal pumps with open impellers and are specially designed with

1780-429: Is built, has an altitude of about 59 ft (18 m) above sea level . The river, once an unnavigable series of braided streams broken up by swamps and ponds, has been managed by weirs into a single channel. Periodic flooding, which shortened the life of many buildings in the lowest part of the city, was normal until major flood control works were completed in the 1970s. The Bristol Avon Navigation, which runs

1869-409: Is channeled from a high-level reservoir to a low-level reservoir, through turbine generators that generate electricity. This is done when the station is required to generate power. During low-demand periods, such as overnight, the generators are reversed to become pumps that move the water back up to the top reservoir. There are countless thousands of pumping stations throughout the world. The following

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1958-431: Is fed from underground gravity pipelines (pipes that are sloped so that a liquid can flow in one direction under gravity). Sewage is fed into and stored in a pit, commonly known as a wet well . The well is equipped with electrical instrumentation to detect the level of sewage present. When the sewage level rises to a predetermined point, a pump will be started to lift the sewage upward through a pressurized pipe system called

2047-488: Is important for its dragonfly communities, with a strong population of scarce chaser (found in only six other areas in England), together with a strong population of white-legged damselfly . red-eyed damselfly is also found. The river is also important for aquatic plants, including Loddon pondweed . The Kellaways – West Tytherton Site of Special Scientific Interest , 3 miles (4.8 km) north east of Chippenham ,

2136-525: Is known as the Avon Navigation. The Avon above Bath remains navigable as far as Bathampton where there is the remains of a flash lock . However, the lock past the weir below Pulteney Bridge was demolished when the weir was reconstructed, so passage between the sections is only possible for dinghies and canoes using the roller slipway on the side of the weir. Beyond its junction with the Kennet and Avon Canal,

2225-607: Is made navigable by the use of locks and weirs. In the centre of Bath it passes under various bridges including the Midland Bridge which was originally built by the Midland Railway Company to allow the Somerset and Dorset Joint Railway access to and from its Green Park Terminus Station . In November 2011 the navigation between Bath and Bristol was closed because of safety concerns about Victoria Bridge . Weston Lock on

2314-451: Is not possible. A package pumping station is an integrated system, built in a housing manufactured from strong, impact-resistant materials such as precast concrete , polyethylene , or glass-reinforced plastic . The unit is supplied with internal pipework fitted, pre-assembled ready for installation into the ground, after which the submersible pumps and control equipment are fitted. Features may include controls for fully automatic operation;

2403-433: Is of considerable importance for studies relating to the possible glaciation of the area, and of the terrace stratigraphy , particularly as it is one of only two accessible terrace deposits in this part of the Avon valley. Newton St Loe SSSI is also listed for geological reasons as it represents the only remaining known exposure of fossiliferous Pleistocene gravels along the River Avon. In conjunction with other sites within

2492-462: Is of geological interest as the river bank exposes Callovian highly-fossiliferous sandstone which contains well-preserved bivalves , gastropods , brachiopods , belemnites and ammonites . Further downstream at Newton St Loe the Newton St Loe SSSI is another Geological Conservation Review SSSI. It represents the only remaining known exposure of fossiliferous Pleistocene gravels along

2581-413: Is on the southern side of the mouth of the river. The deepwater dock was constructed between 1972 and 1977, and is now a major port for the import of motor vehicles . The Royal Portbury Dock has the largest entrance lock into any UK port, accommodating vessels up to 41 m (135 ft) beam, 290 m (951 ft) length and 14.5 m (48 ft) draft. The Avonmouth Docks are on the north side of

2670-496: Is retained by Bristol City Council as statutory and competent harbour authority. The distribution of archaeological finds suggests that the western end of the river between Bath and Avonmouth formed a border between the Dobunni and Durotriges during the late Iron Age , prior to the Roman conquest of Britain . Further east, between Bath and what is now Wiltshire, it may also have formed

2759-517: Is still standing at the site of Chimney Park. Pump station Pumping stations are designed to move water or sewage from one location to another, overcoming gravitational challenges, and are essential for maintaining navigable canal levels, supplying water, and managing sewage and floodwaters. In canal systems, pumping stations help replenish water lost through lock usage and leakage, ensuring navigability. Similarly, in land drainage, stations pump water to prevent flooding in areas below sea level,

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2848-507: Is the point at Netham in Bristol at which boats from the Avon gain access to Bristol's floating harbour . Construction started in 1804 to build the tidal New Cut , where it is joined by the River Malago , and divert the Avon along the Feeder Canal to the harbour; a system designed and built by William Jessop and later improved by Isambard Kingdom Brunel . A weir carries the river into

2937-598: The Avon Gorge has been an important transport route, carrying the River Avon, major roads and two railways. The Bristol Channel has a very high tidal range of 15 metres (49 ft), second only to Bay of Fundy in Eastern Canada ; and the gorge is relatively narrow and meandering, making it notoriously difficult to navigate. Several vessels have grounded in the gorge including the SS Demerara soon after her launch in 1851,

3026-784: The Avoncliff and Dundas Aqueducts which carry the Kennet and Avon Canal , and at Freshford is joined by the Somerset River Frome . Avoncliff Aqueduct was built by John Rennie and chief engineer John Thomas, between 1797 and 1801. The aqueduct consists of three arches and is 110 yards (100 m) long with a central elliptical arch of 60 ft (18 m) span with two side arches each semicircular and 34 ft (10 m) across, all with V-jointed arch stones. The spandrel and wing walls are built in alternate courses of ashlar masonry, and rock-faced blocks. The central span sagged soon after it

3115-614: The Claverton and Crofton Pumping Stations , are preserved as museum attractions. Examples such as land drainage in the Netherlands water supply in Hong Kong and agricultural drainage in Iraq, underscore the vital role these facilities play in supporting modern infrastructure, environmental management, and energy storage. In countries with canal systems, pumping stations are also frequent. Because of

3204-609: The Lam Brook at Lambridge in Bath and then passes under Cleveland and Pulteney Bridges and over the weir. Cleveland Bridge was built in 1826 by William Hazledine , owner of the Coalbrookdale Ironworks, with Henry Goodridge as the architect, on the site of a Roman ferry crossing. Named after the 3rd Duke of Cleveland , it spans the River Avon at Bathwick , and enabled further development of Georgian Bath to take place on

3293-547: The 15 miles (24 km) from the Kennet and Avon Canal at Hanham Lock to the Bristol Channel at Avonmouth, was constructed between 1724 and 1727, following legislation passed by Queen Anne , by a company of proprietors and the engineer John Hore of Newbury . The first cargo of 'Deal boards, Pig-Lead and Meal' arrived in Bath in December 1727. It is now administered by the Canal & River Trust . Throughout Bristol's history

3382-537: The Avon flows through Keynsham towards Bristol . For much of its course after leaving Wiltshire, it marks the traditional boundary between Somerset and Gloucestershire. For most of this distance the navigation makes use of the natural riverbed, with six locks overcoming a rise of 30 feet (9 m). From Bath to Netham Lock where it divides into the New Cut and the Floating Harbour is 12 miles (19 km). The stretch

3471-822: The Avon was created by the Land Drainage Act 1930 and became the Bristol Avon River Board under the River Boards Act 1948 ; the board was in turn replaced by the Bristol Avon River Authority under the Water Resources Act 1963 . Twenty-five minor watercourses were added to the Authority's jurisdiction in 1973. Reorganisation in 1974, under the Water Act 1973 brought the Avon catchment into

3560-466: The New Cut and boats use the adjacent lock. Access to the harbour is only possible during the day when the lock keeper will open the gates unless the water level in the river between Netham and Hanham is above or below the level of the harbour. Netham Lock and the weir form part of Bristol's flood defence mechanisms. It was announced in December 2008 that they would be upgraded as part of the £11 million City Docks Capital Project. In central Bristol, where

3649-500: The River Avon. In conjunction with other sites within the wider area, it has aided the development of a scientific understanding of the history of early glaciation within South West England . The bodies of mammoths ( Mammuthus ) and horses ( Equus ) have been found at the site. The Avon Gorge has been designated as a Site of Special Scientific Interest because it supports some rare fauna and flora, including species unique to

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3738-579: The accumulation of sedimentary mud that created the land initially. Elsewhere, pumping stations are used to remove water that has found its way into low-lying areas as a result of leakage or flooding (in New Orleans , for example). In more recent times, a "package pumping station" provides an efficient and economic way of installing a drainage system. They are suitable for mechanical building services collection and pumping of liquids like surface water, wastewater or sewage from areas where drainage by gravity

3827-521: The base of the cliff, is predominantly made up of sea aster ( Aster tripolium ) and English scurvygrass ( Cochlearia anglica ). There are however two nationally scarce vascular plant species here as well – slender hare's-ear ( Bupleurum tenuissimum ) and long-stalked orache ( Atriplex longipes ). The tidal reaches of the River Avon provide habitat for waterbirds, with 64 species having been recorded up to 2004, including 21 species of shorebird , and 13 species of gull . A catchment board for

3916-520: The bridge and turn it into a pedestrianised zone, but it remains open to buses and taxis. Some 700 metres below Pulteney weir, the river is joined by the Kennet and Avon Canal which connects through Bath Locks . Together with the Kennet Navigation which joins the River Thames at Reading, this provides a through route for canal boats from Bristol to London. From this point downstream the river

4005-432: The canal, using power from the flow of the river. The pumping station is located in a pump house built of Bath Stone, located at river level. Water is diverted from the river by Warleigh Weir, about 200 yd (180 m) upstream. The water flows down a leat to the pumping station, where it powers a water wheel , 24 ft (7.3 m) wide and 17 ft (5.2 m) in diameter, with 48 wooden slats. At full power

4094-570: The centre of the town grew up around a ford , hence the origin of the town's name ("Broad-Ford"). This was supplemented in Norman times by the Grade I listed bridge that still stands today; originally a packhorse bridge , it was widened in the 17th century by rebuilding the downstream side. The Avon Valley between Bradford-on-Avon and Bath is an example of a valley where four forms of ground transport are found: road, rail, river, canal. The river passes under

4183-603: The council granted a 150-year lease to the Bristol Port Company. Pilotage is provided by Bristol Pilots LLP who supply authorised pilots for the River Avon and Bristol City docks, as well as the Severn estuary and the Bristol channel; they are based at Avonmouth Docks. At Great Somerford the Avon has a mean flow rate of 3.355 cubic metres per second (118.5 cu ft/s), and a typical river level range between 0.16 metres (6.3 in) and 0.74 metres (2 ft 5 in) with

4272-571: The crow flies between the source and its mouth in the Severn Estuary . The catchment area is 2,220 square kilometres (860 sq mi). The name "Avon" is loaned from the Common Brittonic abona , "river", which survives in the Welsh word afon [ˈavɔn] . " River Avon ", therefore, literally means "river river"; several other English and Scottish rivers share the name. The County of Avon that existed from 1974 to 1996

4361-450: The demand or projected demand is reasonably defined, and is dependent on a combination of customer needs and fire flow requirements. Average annual per-capita water consumption, peak hour, and maximum daily can vary greatly due to factors such as climate, income levels, population, and the proportions of residential, commercial, and industrial users. Pumping stations in sewage collection systems are normally designed to handle raw sewage that

4450-458: The efficiency and monitoring capabilities of pumping stations, essential for modern systems. Pumped-storage schemes represent a critical use of pumping stations, providing a method for energy storage and generation by moving water between reservoirs at different elevations, highlighting the versatility and importance of pumping stations across sectors. Some pumping stations have been recognized for their architectural and historical significance, e.g.

4539-417: The electrical switchgear and control systems. Due to the much reduced health and safety concerns, and smaller footprint and visibility, submersible pump sewage pumping stations have almost completely superseded traditional sewage pumping stations. Further, a refit of a traditional pumping station usually involves converting it into a modern pumping station by installing submersibles in the wet well, demolishing

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4628-512: The fate of the floating harbour as commercial docks and saw them replaced by docks at Avonmouth where the Avon joins the Severn Estuary . Before reaching its mouth, the Avon is joined by the River Trym at Sea Mills which was the site of Portus Abonae , a Roman port. Shortly after, it passes the village of Pill on the south bank where the Pill Hobblers were based in order to tow ships up

4717-714: The gorge. There are a total of 24 rare plant species and two unique trees: the Bristol and Wilmotts's whitebeams . Other notable plants include Bristol rock-cress , Bristol onion , spiked speedwell , autumn squill and honewort . Other areas along the river which have this designation include Bickley Wood , Cleeve Wood, Hanham for its large population of Bath asparagus ( Ornithogalum pyrenaicum ). Stidham Farm near Keynsham contains at least At least 2 metres (7 ft) of Pleistocene terrace-gravels, consisting of limestone clasts mainly, but also with Millstone Grit , Pennant Sandstone , flint and chert clasts. The site

4806-461: The highest ever recorded being 3.22 metres (10.6 ft). For the purpose of water quality monitoring and improvement the river is divided into several catchment management areas; South of Malmesbury, Bristol Avon Rural and Bristol Avon Urban. In the rural area 22 water bodies are classified as good, 46 as moderate and 8 as poor. The main reasons for not achieving good scores are pollution from waste water, agriculture and rural land management. In

4895-434: The highest river level was also in December 2013 when it reached 4.41 metres (14.5 ft) while the normal range is 0.75 metres (2 ft 6 in) and 1.60 metres (5 ft 3 in), with a flow rate of 18.274 cubic metres per second (645.3 cu ft/s). In Bath at St James, which is 180 metres (590 ft) upstream of Pultney Weir the mean flow is 20.466 cubic metres per second (722.7 cu ft/s), with

4984-523: The mill leat. Each pump stroke raises 50 imperial gallons (230 L; 60 US gal) of water to the canal. In 1981, British Waterways installed two 75 horsepower (56 kW) electric pumps just upstream from the station. The Avon then flows through Bathford , where it is joined by the Bybrook River , and Bathampton where it passes under the Bathampton Toll Bridge . It is joined by

5073-479: The natural river course of the Avon and its tributaries , the River Frome and Siston Brook , and is intimately entwined with Bristol's city centre as few docks are. As a result of this, the floating harbour is one of the more successful pieces of dockland regeneration, with much of the dockside now occupied by residential, office and cultural premises, and the water area heavily used by leisure craft. The harbour gave

5162-412: The one in 1799/1800 damaging Pulteney Bridge . Various points along the river including the valley around Freshford are at risk of fluvial flooding, as a result of sediment entering the river and narrowing the channel. To help cope with this some areas on the banks of the river are designated as a functional floodplain to cope with increased flow volumes. The potential changes to weather patterns as

5251-412: The other hand, are engineered to handle sewage, with designs that ensure reliability and safety, minimizing environmental impacts from overflows. Innovations in pump technology and station design have led to the development of submersible pump stations, which are more compact and safer, effectively reducing the footprint and visibility of sewage management infrastructure. Electronic controllers have enhanced

5340-565: The outskirts of Bath is in what now forms the Newbridge area. Weston Cut is a man made channel, opened in 1727, for boats to approach and pass through Weston Lock; the island created between the cut and the river weir became known as Dutch Island after the owner of the brass mill established on the riverside in the early 18th century. Kelston Lock and weir have permanent moorings above and below them. The Riverside Inn and Saltford Marina are also close by. Saltford Lock and weir are overlooked by

5429-571: The pipes and connections between components. The development of a packaged pump station system combined all components into a single housing which not only eliminates uneven settling issues, but pre-plumbing and outfitting each unit prior to installation can reduce the cost and time involved with civil work and site labor. Water pumping stations are differentiated from wastewater pumping stations in that they do not have to be sized to account for high peak flow rates. They have five general categories: Water pumping stations are constructed in areas in which

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5518-423: The port an advantage by enabling shipping to stay afloat rather than grounding when the tide went down. Downstream of central Bristol, the river passes through the deep Avon Gorge , spanned by Brunel's Clifton Suspension Bridge : the river is tidal and is navigable by seagoing vessels at high tide but dries to a steep-sided muddy channel at low tide. It was largely the challenge of navigating this section that sealed

5607-479: The pump house and retiring the dry well by either stripping it, or knocking down the internal partition and merging it with the wet well. Pump manufacturers have always designed and manufactured electronic devices to control and supervise pumping stations. Today it is also very common to use a programmable logic controller (PLC) or Remote Terminal Unit (RTU) for such work, but the experience needed to solve certain particular problems, makes an easy choice to look for

5696-723: The reason for its designation as an SSSI is the presence of a population of the true service-tree ( Sorbus domestica ) growing on the cliffs. This tree is nationally rare in Britain, and this site hosts the largest known population in England. Other notable species of Sorbus here are the whitebeams Sorbus eminens and Sorbus anglica , both of which are also nationally rare in Britain. The nationally scarce large-leaved lime ( Tilia platyphyllos ) also occurs, and herbs include field garlic ( Allium oleraceum ) and pale St. John's-wort ( Hypericum montanum ). The saltmarsh vegetation, which lies at

5785-529: The remains of the Kelston Brass Mill, which was working until 1925. It is a Grade II listed building . Alongside the lock is a pub , whose garden extends over the lock to the small island between the lock and weir. The lock was opened in 1727 and destroyed in 1738 by rival coal dealers to stop the use of the river for transportation. In its heyday, between 1709 and 1859, Swineford had an active brass and copper industry around Swineford Lock , served by

5874-572: The river and are one of the UK's major ports for chilled foods, especially fruit and vegetables. The first dock at Avonmouth, Avonmouth Old Dock, was opened in 1877 and acquired by Bristol Corporation in 1884. In 1907, a much larger dock, the Royal Edward Dock, was opened. The docks form part of the Port of Bristol and were operated by the Port of Bristol Authority, part of Bristol City Council , until 1991 when

5963-631: The river flows east to Malmesbury , where it is joined by its first major tributary, the Tetbury Avon , which rises just east of Tetbury in Gloucestershire. This is known locally as the Ingleburn, which in Old English means 'English river'. The two rivers flow north and south of a rocky outcrop, almost creating an island for the ancient hilltop town of Malmesbury to sit on. Upstream of this confluence

6052-400: The river is tidal , it is diverted from its original course into the New Cut, a channel dug between 1804 and 1809 at a cost of £600,000. The original course is held at a constant level by lock gates (designed by Jessop) and is known as the floating harbour . The harbour is protected by an 1870s replacement for Jessop's locks. This unusual dock has a tentacled plan resulting from its origins as

6141-707: The river is sometimes referred to as the 'River Avon (Sherston branch)' to distinguish it from the Tetbury branch. After the two rivers merge, the Avon turns southeast away from the Cotswolds and then quickly south into the clay Dauntsey Vale , where it is joined by the River Marden , until it reaches the biggest town so far, Chippenham . The wide vale is now known as the Avon Vale, and the river flows on via Lacock to Melksham , then turns north-west through Bradford-on-Avon , where

6230-589: The river to Bristol and where yachts and other boats still have moorings in Chapel Pill and Crockerne Pill. It then passes under the Avonmouth Bridge which carries the M5 motorway . The main span is 538 ft (164 m) long, and the bridge is 4,554 ft (1,388 m) long, with an air draught above mean high water level of 98.4 ft (30 m). The river then serves two major dock areas. The Royal Portbury Dock

6319-549: The river which also provided water power for the cloth industry, as did the River Boyd , a tributary which flows into the Avon near Bitton . Keynsham Lock opened in 1727. Just above the lock are visitor moorings and a pub, on an island between the lock and the weir. The weir side of the island is also the mouth of the River Chew . Hanham is the last tidal lock, after which the river is joined by Brislington Brook . Netham Lock

6408-463: The schooner Gipsy in 1878, the steam tug Black Eagle in 1861 and the Llandaff City . In 1877, Halfpenny Bridge, a pedestrian toll bridge crossing the river from Bath Spa railway station to Widcombe , collapsed with the loss of about 10 lives amongst a large crowd going to the Bath and West Agricultural show . The Avon has flooded several times in its recorded history. These floods include

6497-418: The sewage in the wet well, dry wells are underground, confined spaces and require appropriate precautions for entry. Further, any failure or leakage of the pumps or pipework can discharge sewage directly into the dry well with complete flooding not an uncommon occurrence. As a result, the electric motors are normally mounted above the overflow, top water level of the wet well, usually above ground level, and drive

6586-403: The sewage pumps through an extended vertical shaft. To protect the above ground motors from weather, small pump houses are normally built, which also incorporate the electrical switchgear and control electronics. These are the visible parts of a traditional sewage pumping station although they are typically smaller than the underground wet and dry wells. More modern pumping stations do not require

6675-540: The site, was made out of handmade brick from Madero. It is 106 feet tall and 6 feet in diameter. The top of the chimney has a double row of bricks that form a partial design, but the top was never completed. The chimney was dedicated as a Texas Historic Landmark by the Texas Historical Commission in 1985. The boilers began operation in 1907 and the lift station started to pump water from the Rio Grande . Wood

6764-407: The south side of the river. It was designed by architect Henry Goodridge to take the traffic of his day, horse-drawn vehicles and pedestrians, and was constructed using Bath Stone and a cast iron arched span. Pulteney Bridge was completed in 1773 and is designated by English Heritage as a Grade I listed structure. The bridge was designed by Robert Adam , and is one of only four bridges in

6853-495: The upper parts of the canal, but if no suitable source is available, a pumping station can be used to maintain the water level. An example of a canal pumping station is the Claverton Pumping Station on the Kennet and Avon Canal in southern England, United Kingdom. This pumps water from the nearby River Avon to the canal using pumps driven by a waterwheel which is powered by the river. Where no external water supply

6942-504: The urban area one water body is rated good, while 12 are rated moderate and one is poor. The pollution from upstream is added to by the effects of industry, manufacturing and other businesses and is significantly affected by physical modifications to the water course. Within the catchment area there are 137 river water bodies and 6 lakes; of these 22 per cent of rivers are rated as good ecological status, 40 per cent good for chemical status and 31 per cent good for biological status. The river

7031-622: The village of Acton Turville in South Gloucestershire , before flowing through Wiltshire into Somerset . In its lower reaches from Bath (where it meets the Kennet and Avon Canal ) to the Severn Estuary at Avonmouth near Bristol , the river is navigable and is known as the Avon Navigation . The Avon is the 19th longest river in the United Kingdom, at 83 miles (134 km), although there are just 19 miles (31 km) as

7120-412: The water upwards into water channels that finally drain into the sea. The Victorians understood this concept, and in the United Kingdom they built pumping stations with water pumps , powered by steam engines to accomplish this task. In Lincolnshire, large areas of wetland at sea level, called The Fens , were turned into rich arable farmland by this method. The land is full of nutrients because of

7209-431: The way the system of canal locks work, water is lost from the upper part of a canal each time a vessel passes through. Also, most lock gates are not watertight, so some water leaks from the higher levels of the canal to those lower down. The water has to be replaced or eventually the upper levels of the canal would not hold enough water to be navigable. Canals are usually fed by diverting water from streams and rivers into

7298-438: The well (for example during peak flow periods and wet weather) additional pumps will be used. If this is insufficient, or in the case of failure of the pumping station, a backup in the sewer system can occur, leading to a sanitary sewer overflow —the discharge of raw sewage into the environment. Sewage pumping stations are typically designed so that one pump or one set of pumps will handle normal peak flow conditions. Redundancy

7387-404: The wet well. Traditional sewage pumping stations incorporate both a wet well and a "dry well". Often these are the same structure separated by an internal divide. In this configuration pumps are installed below ground level on the base of the dry well so that their inlets are below water level on pump start, priming the pump and also maximising the available NPSH . Although nominally isolated from

7476-429: The wheel uses 2  tons (2  tonnes ) of water per second and rotates five times a minute. The water wheel drives gearing which increases the speed to 16  rpm . From here, cranks drive vertical connecting rods which transfer the energy to two 18 ft (5.5 m) long cast iron rocking beams. Each rocking beam in turn drives an 18 in (0.5 m) diameter lift pump , which also take their supply from

7565-401: The wider area, they have aided the development of a scientific understanding of the history of early glaciation within South West England . At Horseshoe Bend, Shirehampton the wooded cliff and a narrow salt marsh are supported by rocks of Devonian age Old Red Sandstone and Carboniferous Limestone , overlain by with Triassic dolomitic conglomerate . The site's principal interest and

7654-629: The world with shops across the full span on both sides. It is named after Frances Pulteney , heiress in 1767 of the Bathwick estate across the river from Bath. Floods in 1799 and 1800 wrecked the north side of the bridge, which had been constructed with inadequate support. It was rebuilt by John Pinch the Elder , surveyor to the Pulteney estate, in a less ambitious version of Adam's design. Bath and North East Somerset council have discussed plans to ban vehicles from

7743-437: Was built and has been repaired many times. The Dundas Aqueduct was built by the same team between 1797 and 1801 and completed in 1805. James McIlquham was appointed contractor. The aqueduct is 150 yards (137.2 m) long with three arches built of Bath Stone , with Doric pilasters, and balustrades at each end. The central semicircular arch spans 64 feet (19.5 m); the two oval side arches span 20 feet (6.1 m). It

7832-592: Was named after the river, and covered Bristol , Bath , and the lower Avon valley. The Avon rises on the southern edge of the Cotswold hills , at Didmarton in Gloucestershire; at Joyce's Pool a plaque marks the source. It flows south-east into Wiltshire to Sherston , where it is joined by the Luckington Brook which drains an area west of Luckington that includes the Badminton House estate. From Sherston

7921-402: Was used in units of 2 to 3 cords (7 to 11 m³) and a crew of 26 men with teams of mules worked around the clock to keep the boilers fed. The plant was later operated by John H. Shary and by Hidalgo County Water Control and Improvement Districts No. 7 and No. 14. The property was developed for recreational use after dams and a new pumping plant were built upstream in the late 1950s. The chimney

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