South Forty-Foot Drain

Drainage canal in eastern England

South Forty-Foot Drain

The South Forty-Foot Drain at Pointon, between Boston and Guthrum Gowt. Here its origin as a drainage channel is very evident.

Specifications
Maximum boat length| 70 ft 0 in (21.34 m)
Maximum boat beam| 20 ft 0 in (6.10 m)
Locks| 1
(1 or 2 more locks will be required when the drain is joined to the River Glen)
Maximum height above sea level| −1 ft (−0.30 m)
Status| Under restoration
Navigation authority| Environment Agency
History
Original owner| Black Sluice Commissioners
Principal engineer| Earl of Lindsey
Date of act| 1765
Date of first use| 1846
Date completed| 1770
Date closed| 1971
Date restored| March 2009
Geography
Start point| The Haven, Boston
End point| Guthram Gowt

* v
* t
* e

South Forty Foot Drain

Legend

|  |  |

|  | To The Wash

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|  | The Haven, Boston
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|  | Boston Lock
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|  | London Road bridge
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|  | Black Sluice Pumping Station
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|  |
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|  |  A16 Spalding Road bridge
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|  | North Forty Foot Drain (Cook's Lock PS)
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|  | Chain Bridge PS
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|  | Old Hammond Beck
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|  | New Hammond Beck
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|  |  A52 bridge
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|  |  B1192 Hubbert's Bridge
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|  | Clay Dike (Holland Fen PS)
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|  | Skerth Drain (Swineshead PS)
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|  |  A17 Station Road, Swineshead
|  |

|  | Great Hale Eau (Great Hale & Little Hale PS)
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|  | Mill Drain (Bicker Fen PS)
|  |

|  | Helpringham Eau
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|  | Engine Drain (Helpringham PS)
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|  | Sleaford–Spalding Railway bridge
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|  | Donington North Ing PS
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|  | Helpringham Beck
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|  | Twenty Foot Drain (Swaton PS)
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|  | Swaton Eau
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|  | Widening required below here
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|  |  A52 Donington High Bridge
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|  | Mallard Hurn PS
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|  | Horbling PS
|  |

|  | Ouse Mere Lode
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|  | Billingborough PS
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|  | Quadring PS
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|  | Billingborough Lode
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|  | Neslam Bridge
|  |

|  | Sempringham Lode (Sempringham PS)
|  |

|  | Pointon Lode
|  |

|  | Dowsby Fen PS / Gosberton PS
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|  |
|  |

|  |  B1397 Kingston's Bridge
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|  | Dowsby Lode PS
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|  |
|  |

|  | Rippingale PS
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|  | Rippingale Running Dike
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|  | Caswell's Bridge
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|  | Dunsby Fen PS
|  |

|  | Star Lode (Pinchbeck North Fen PS)
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|  | Hacconby Fen PS
|  |

|  | Fens Link (route 11)
|  |

|  | New lock (route 11)
|  |

|  | Lane Dike (Black Hole Drove PS)
|  |

|  | Morton Drain
|  |

|  | New Dike (Dyke Fen PS)
|  |

|  | Engine Drain (Twenty Corner PS)
|  |

|  |  A151 Bourne Road bridge
|  |

|  | New lock (route 11)
|  |

|  | Fens Link (routes 1 and 11)
|  |

|  | River Glen to Spalding
|  |

|  | Guthram Gowt
|  |

|  | Weir Dike and River Glen
|  |

|  | Tongue End Jn
|  |

|  | Tongue End Pumping Station
|  |

|  | Weir Dike
|  |

|  | Bourne Eau
|  |

|  | Long Drove bridge, Tongue End
|  |

|  | River Glen
|  |

|  | (PS : Pumping Station)
|  |  |  |  |  |
The Holland Fen pumping station, which pumps water from Clay Dike into the South Forty-Foot Drain

The South Forty-Foot Drain, also known as the Black Sluice Navigation, is the main channel for the land-drainage of the Black Sluice Level in the Lincolnshire Fens. It lies in eastern England between Guthram Gowt and the Black Sluice pumping station on The Haven, at Boston. The Drain has its origins in the 1630s, when the first scheme to make the Fen land available for agriculture was carried out by the Earl of Lindsey, and has been steadily improved since then. Water drained from the land entered The Haven by gravity at certain states of the tide until 1946, when the Black Sluice pumping station was commissioned.

The Drain was navigable until 1971, when improvements to the pumping station led to the entrance lock being removed. It is currently being upgraded to navigable status by the Environment Agency, as part of the Fens Waterways Link, with a new entrance lock being completed in December 2008, giving access to the first 12 miles (19 km) of the drain, and the upgrading of the southern section, including a link to the River Glen to allow navigation to Spalding forming phase 2 of the project.

## History[edit]

The Lincolnshire Fens are an area of low-lying land which have been subject to flooding and attempts to prevent it for centuries. In medieval times, the Midfen Dyke was built to drain the area, but by 1500, this was regarded less as a drain for the land than as a boundary marker between the Parts of Holland and the Parts of Kesteven, two of the three medieval subdivisions of Lincolnshire which functioned as county councils until their abolition in 1974. The first serious attempt to drain the area to the south west of Boston, now known as the Black Sluice Area but formerly known as the Lindsey Level, was from 1635 to 1638, when the Earl of Lindsey agreed with the Commissioners of Sewers for Lincolnshire to carry out drainage works which would make 36,000 acres (150 km2) of land available for agricultural use. The Earl and a group of Adventurers paid for the works, in return for land grants.[1]

The cost of the work was £45,000, and involved the construction of a sluice near Boston, called Skirbeck Sluice, the construction of the first 8 miles (13 km) of the South Forty-Foot Drain, from Boston to Great Hale, the construction of two drains from there to Guthram, which were called the Double Twelves, and the construction of the Clay Dyke Drain.[1] The scheme was not popular with the local fenmen, who made a living from fishing and wildfowling, or with the Commoners, who had a right to graze animals on the common land when it was not flooded. They attempted to get Parliament to rule in their favour, but after three years of trying, they abandoned the idea of legal redress, and took direct action. They destroyed much of the work, as well as buildings and crops,[2] and burnt Skirbeck Sluice. The Earl of Lindsey's contract with the Commissioners of Sewers was revoked by parliament, and it was another hundred years before the next attempt to drain the area.[1]

In an attempt to drain Holland Fen, and prevent flooding from the River Witham, an adventurer called Earl Fitzwilliam constructed a drain in 1720, which runs broadly parallel to the River Witham, and terminated at Lodewick's Gowt, a sluice which he constructed on the Witham close to the location of the present Grand Sluice. The drain was for many years called Earl Fitzwilliam's drain, but is now called the North Forty-Foot Drain. The scheme was not entirely successful.[3]

### Second Sluice[edit]

The Witham Drainage Act 1762 among other things constituted the Commissioners of Sewers for the Second and Sixth District, which covered the area including Asgarby, Ewerby, Great Hale, Heckington, Holland Fen, Howell, Little Hale and South Kyme.[1] Much of the area to the south and west of Boston, some 91 square miles (240 km2), was inundated by the Great Flood of 1763,[4] and against this background, the Black Sluice Drainage Act 1765 (5 Geo. 3. c. 86) was obtained which created the Black Sluice Commissioners, giving them power to raise taxes and authority to carry out drainage works. The scheme largely revived the Earl of Lindsey's original scheme.[1] The initial design work was carried out by the civil engineer Langley Edwards, on loan from the Witham Commissioners. Some of the surveying was performed by John Landen, who was the steward of the estate of Earl Fitzwilliam at Peterborough, and a proficient amateur mathematician. The two men were jointly appointed Surveyors of the Works, acting as engineers for the scheme, while John Chapman and Richard Strattard were assistants. A new sluice, called the Black Sluice, was built at Boston as a direct replacement for the Skirbeck Sluice, having three openings with a total width of 40 feet (12 m). The 8 miles (13 km) of the drain were scoured from Boston to Great Hale, beyond which the Main Drain was upgraded by cutting a new 14-mile (23 km) channel, effectively extending the South Forty-Foot Drain to Guthram, on the banks of the River Glen.[4] A total of 65 miles (105 km) of highland streams were improved by scouring and raising of the banks. The estimated cost of £16,000 was raised by issuing bonds, but the project overran, and another Act of Parliament, the Black Sluice Drainage Act 1770 (10 Geo. 3. c. 41) was obtained in 1770 to authorise the raising of the drainage taxes, to cover the difference.[1] By mid-1769, when Landen and Edwards left the project, because the work was largely complete, the scheme had cost £24,000. They were replaced by Edward Hare as Surveyor of Works, with Chapman and Strattard continuing as assistants. A historian called W. H. Wheeler, who chronicled the Lincolnshire fens, wrote that "the works were efficiently carried out and, being well-designed, entirely answered expectation."[4]

On the River Witham, the Grand Sluice was constructed and opened on 15 October 1766, and this prevented tidal water from entering the river, and hence flooding the Holland Fen. The Boston Harbour Commissioners were created by the Boston Port Act 1766, and they carried out improvement works to The Haven, which resulted in lower water levels at the Black Sluice, and hence more efficient draining from the South Forty-Foot Drain. Water was pumped into the drain by a series of windmills driving scoop wheels. Maps of the area produced in 1783 by Edward Hare show 46 such mills, which provided drainage for 32,000 acres (130 km2) of agricultural land. Extreme high tides in 1810 and again in 1820 resulted in widespread flooding, and further thought was given to improving the flood defences.[1]

With the improvements to the River Witham, the final section of Earl Fitzwilliam's drain to Lodewick Gowt was filled in, and the channel was diverted to join the South Forty-Foot Drain. Renamed the North Forty-Foot Drain, it now supplies Cook's Lock and Holland Fen pumping stations.[3]

### Third Sluice[edit]

Reports on improvements to the system were produced in 1843 by the surveyor Mr W Lewin and in 1845 by Sir John Rennie. Rennie's scheme involved the provision of a catchwater drain to collect water draining from the higher ground to the west before it entered the fenlands, but an Act of Parliament to authorise its construction was defeated, and so in 1846 a report by Mr W Cubit which proposed improvements to the existing infrastructure was accepted by the Commissioners. A new Black Sluice, including a 20-foot (6.1 m) wide navigation lock, was constructed to the south of the original one, with the cill level 6 feet (1.8 m) lower, which enabled the gradient of the South Forty-Foot Drain to be increased to 3 inches per mile (5 cm/km). Many of the tributary drains were also improved. 1846 also marked the beginning of the use of steam engines for pumping. Ten years later, a map covering 18,000 acres (73 km2) of the Black Sluice area showed nine steam-powered and eight wind-powered drainage engines in use.[1]

The River Witham Outfall Improvement Act 1880 authorised further improvements to the mouth of the Witham, to which the Black Sluice Commissioners contributed £65,000. This work led to a further drop of 4 feet (1.2 m) in the low water level at the Black Sluice. Oil and paraffin engines began to replace steam and wind engines from 1910, and by 1935 there were 15 such engines pumping water into the South Forty-Foot Drain. The passing of the Land Drainage Act 1930 resulted in the Commissioners being replaced by the Black Sluice Internal Drainage Board,[1] while responsibility for the rivers in the area passed to the Witham and Steeping Rivers Catchment Board.[5] With war imminent, the Rivers Board took over the Black Sluice and the South Forty-Foot Drain in 1939, and although progress was interrupted by the Second World War, a £374,000 scheme to construct the Black Sluice pumping station and to widen 11 miles (18 km) of the drain from Boston to Donington Bridge was completed in 1946.[1] The pumping station contained three 100-inch (2.5 m) pumps, each powered by a 900-horsepower (670 kW) 5-cylinder vertical diesel engine manufactured by Ruston.[6]

### Modern era[edit]

Paraffin and oil engines gave way to electrically powered pumping stations in the 1950s, with the Board constructing six electric and one diesel pumping station to improve drainage to an extra 11,000 acres (45 km2) of land. In 1960, the decision was taken to further improve drainage of an area of 70,000 acres (280 km2), as part of a £1.4 million scheme which included the addition of two extra pumps at the Black Sluice, replacement of existing pumps elsewhere, and the widening of 7 miles (11 km) of the South Forty-Foot Drain from Donington Bridge to Rippingale Running Dyke. Jurisdiction for the Drain and the sluice passed to the Lincolnshire River Board at this time. The work, which began in 1962 and was completed in 1968, proved successful in preventing flooding during severe wet weather in the winter of 1968/9.[1] With three 900-horsepower (670 kW) and two 925-horsepower (690 kW) diesel engines, the upgraded pumping station could pump 800 thousand gallons per minute (60 m3/s). Responsibility for the drain and the sluice passed to the National Rivers Authority in 1990, and to the Environment Agency in 1995.[7]

Despite all the improvements, serious flooding occurred in 1999 when the bank of the drain was breached near Pinchbeck. Staff from the Environment Agency and the Black Sluice Internal Drainage Board successfully repaired the breach before properties were flooded, and a review of the flood defences was then carried out. The report recommended improvements to some of the banks, but funding for the work was not available, and so no work was done at the time.[8]

In 2013, the pumping station flooded as a result of a tidal surge. The three engines dating from 1946 were damaged by water ingress, and were decommissioned. The other two engines were at a higher level, and remained operational, but were by that time nearly 50 years old, and nearing the end of their operational life. Refurbishment of the pumping station was estimated to cost between £15 and £20 million, and so the effectiveness of the station was reviewed.[9] The review showed that it had been used for less than 2 days of every 100 days since it was constructed in 1946, and that the station barely affected the number of properties that might be flooded. By using the adjacent gravity sluice and the lock to discharge water from the South Forty-Foot Drain, better control of water levels could be achieved, and this had been demonstrated during a period of heavy rainfall in spring 2018.[10] Accordingly, the remaining two pumps were decommissioned in October 2018, and the Environment Agency are looking at what to do with the building.[11]

## Functions[edit]

Black Sluice pumping station at Boston, where the Drain meets The Haven, was decommissioned in 2018.

The South Forty-Foot Drain serves as a district boundary over the length where it runs roughly south to north. South of Donington High Bridge, the Drain separates South Kesteven to the west from South Holland to the east. The boundary then continues southwards along the River Glen. North of Donington, the boundary between the borough of Boston to the east and North Kesteven to the west follows the line of the Drain. As the Drain crosses the line of the Midfen Dyke, just before the Nottingham to Boston railway joins it at Great Hale pumping station, the boundary turns northwards, following its medieval course.

The main job of the Drain is to gather the waters pumped from the Kesteven Fens, the Holland Fens and the Weir Dyke, a soak dike in Bourne North Fen, alongside the Bourne Eau and River Glen, northwards and eastwards to the Black Sluice at Boston, where they are discharged to the tidal waters of The Haven. The Weir Dyke takes its name from a weir in the bank of the Bourne Eau at Tongue End, which was constructed by the Black Sluice Commissioners, to allow water from the Bourne Eau to overflow the bank when excess water could not flow into the River Glen in times of flood.[12] The overfall weir became redundant when the Tongue End pumping station was constructed in 1966.[1]

The South Forty-Foot Drain and the Black Sluice pumping station, together with most of the side channels which run into the drain are the responsibility of the Environment Agency. Management of the drainage ditches which drain the Fens are the responsibility of the Black Sluice Internal Drainage Board, who maintain 34 pumping stations and three gravity stations in the region.[13] Of these, 21 are situated on the banks of the Drain, and pump directly into it, while one, the Black Hole Drove pumping station, is constructed over the channel, and acts as a boundary between the part of the Drain managed by the Environment Agency, and that managed by the Drainage Board.[14]

## Navigation[edit]

The new lock at Black Sluice, allowing navigation from The Haven to the Drain

Prior to 1971, the Drain had been navigable, and in 1939, it was listed as being navigable for 21 miles (34 km), from Boston to Gutham (sic) Gowt. Boats up to 70 feet (21 m) long and 18 feet (5.5 m) wide, with a draught of about 7 or 8 feet (2.1 or 2.4 m) could use the waterway as far as Donington Bridge, but above that, the draught decreased to 3 to 4 feet (0.9 to 1.2 m). It was only open to commercial craft, as pleasure craft were expressly prohibited.[15] It is unclear whether there was ever a right of navigation, or whether the Black Sluice Commissioners simply allowed it. The entrance lock was 72 by 20 feet (21.9 by 6.1 m), and most trade was between Boston and Donnington Bridge, with pleasure boating not being allowed prior to 1962. Navigation ceased in 1971, when the lock was closed and removed,[16] with little protest being made. More recently, the East Anglian Waterways Association promoted the idea that the Drain could again be made navigable as part of a larger scheme to improve leisure facilities. The local authorities which were part of the Fens Tourism consortium conducted a feasibility study, and this report was formally adopted as the Fens Waterways Link by the Environment Agency in 2004, with the support of the local authorities, the East Anglian Waterways Association and the Inland Waterways Association.[17]

The scheme involved a total of 150 miles (240 km) of waterway, of which 50 miles (80 km) would be new cruiseway, while the rest would be existing waterways which could be upgraded or have their access improved. When completed, it would connect the Rivers Witham, Glen, Welland, Nene and Great Ouse, and was heralded as the biggest waterway enhancement project in Europe by the Environment Agency.[18] In 2007 they obtained funding for the link between Boston and Spalding. Work on a new lock beside the Black Sluice pumping station at Boston \- to connect The Haven and the South Forty-Foot Drain - was formally started on 8 February 2008,[19] and was completed in December 2008, with the official opening ceremony being held on 20 March 2009.[20] The lock project formed phase 1 of the scheme, and the cost of £8.5 million was jointly funded by the European Regional Development Fund, the East Midlands Development Agency, and Lincolnshire County Council. The lock is designed to be used for a period either side of high tide, and so there is a rise from the Drain to the Haven. It has conventional mitre gates at one end, but uses rotating sector gates at the tidal end, each one weighing 12.1 tonnes.[21]

The lock opened up nearly 12 miles (19 km) of waterway. As part of the upgrade, new 48-hour moorings were constructed on The Haven, for boats about to enter the Drain, and on the South Forty-Foot Drain near the Black Sluice pumping station at Boston,[20] at Swineshead Bridge and at Hubbert's Bridge.[22] The upper limit of navigation was initially Donington High Bridge, where the Swaton Eau joins the South Forty-Foot Drain and provides a wider section where boats can be turned. Beyond the bridge, the drain was officially only suitable for canoes and kayaks.[23] However, eight narrow boats cruised on the waterway at Easter 2009, and although the channel was narrower and not as deep after Donington Bridge, all of them successfully reached Kingston's Bridge, some 3.7 miles (6.0 km) further on, where the outlets from Dowsby Fen and Gosberton pumping stations provided enough width to turn a 70-foot (21 m) boat. Further progress was blocked by scaffolding erected so that the bridge could be re-decked, rather than by lack of water.[24]

The drain has been renamed as the Black Sluice Navigation by the Environment Agency. In order to use the navigation, an Environment Agency licence is required, and as there are no permanent moorings available on the drain, these are available for one day or seven days.[23] Water levels are maintained at a lower level during the winter months, when flows are high, and the Drain needs to be able to cope with higher volumes of rainfall, than during the summer months, when navigable levels are maintained. As on the neighbouring River Witham, the switch between winter and summer levels is normally made at the beginning of April.[20]

### Development[edit]

Phase 2 of the Fens Waterway project involves the link between Donington Bridge and Crowland and Cowbit Washes, which are located on the River Welland near Spalding. In order to make the financing of the phase more viable, it was split into two halves, with phase 2a covering the section from Donington to Surfleet Seas End on the River Glen, and phase 2b covering from there onwards.[20] The initial technical assessment and obtaining of planning permission for phase 2, which involved widening of the South Forty-Foot Drain from Donington to a new road crossing under the A151, a new lock and a junction with the River Glen at Guthram Gowt was funded by the East Midlands Development Agency.[25] This section would involve changes at Black Hole Drove pumping station, which has been built across the drain and hence would prevent navigation.[17] Major contracts for this phase were expected to be awarded in April 2009,[20] but appraisal of the technical assessment revealed that more than one route needed to be considered before the best solution could be selected. While the obvious solution would be to connect the Glen and the drain where they are only a short distance apart, the Lincolnshire Waterways Partnership also considered the creation of new channels up to 9.3 miles (15.0 km) long to form the link. In the meantime, the economic situation changed, so that sources of funding were not so freely available, and by the end of 2010, no clear dates had been set for the next construction phase.[26]

By late 2011, there were ten different routes under consideration, and an assessment of them was expected to be delivered in spring 2012. Halcrow Group, the engineering consultancy, were responsible for carrying out the assessment, which looked at the benefits that each route might provide, not only for navigation but also for water quality, water resources and habitat for wildlife. The study was expected to provide a short-list of routes, which would then be the subject of further consultation.[27] By mid-2012, the merits of the ten routes had been considered, including the economic, environmental and technical issues involved, and a broad outline of the corridor for the link was scheduled to be published in September. After that, consultation with landowners and stakeholders took place, to establish the final route, for which design of the channel and the associated locks, bridges, moorings and pumping stations could then begin.[28] By the end of the assessment process for the ten routes, two remained. One was route 1, the original suggestion which used the existing course of the South Forty-Foot Drain for most of its length, while the second was a new route, designated as route 11. Route 11 had become the preferred route by the summer of 2014. It involves widening the South Forty-Foot Drain from Donington to Surfleet, to a point near to the Black Hole Drove pumping station. A new lock would be needed at this location, but would connect to a new channel, rather than to the rest of the drain. It would pass under a new bridge on the A151, and the connection to the River Glen would involve another new lock. An environmental survey of other watercourses near to the route revealed that several provide habitat for nationally important plants and invertebrates.[29]

### Precursors[edit]

The idea of a link between the South Forty-Foot Drain and the River Nene is not new, as the first plans for such a connection were proposed in 1809. In that year, proposals for a new canal between the Oakham Canal at Oakham and the Stamford Canal at Stamford, which had been discussed in 1785, were revived, as part of a larger plan for a 7-mile (11 km) link from Stamford to the River Nene at Peterborough, and a connection from near Market Deeping, where the Stamford Canal rejoined the River Welland, northwards to the South Forty-Foot Drain. A bill for this, together with one for a rival scheme to link Stamford to the Grand Junction Canal, which also included a connection to the South Forty-Foot Drain, were put before Parliament in 1811, but neither met with any success. The idea was raised again in 1815 and 1828, but no further action was taken.[30]

## Route[edit]

Map all coordinates using: OpenStreetMap

Download coordinates as:

* KML
* GPX (all coordinates)
* GPX (primary coordinates)
* GPX (secondary coordinates)

Point  | Coordinates
(Links to map resources)  | OS Grid Ref | Notes

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Tongue End  | 52°45′14″N 0°17′20″W﻿ / ﻿52.754°N 0.289°W﻿ / 52.754; -0.289﻿ (Tongue End) | TF155187  | Weir Dyke near where Bourne Eau joins the River Glen
Guthram  | 52°47′17″N 0°15′54″W﻿ / ﻿52.788°N 0.265°W﻿ / 52.788; -0.265﻿ (Guthram) | TF170225  | Engine Drain and Weir Dyke join to form South Forty-Foot Drain (SFF)
Caswall's Bridge  | 52°49′55″N 0°16′16″W﻿ / ﻿52.832°N 0.271°W﻿ / 52.832; -0.271﻿ (Caswall's Bridge) | TF165274  | Pumping stations on both sides of the SFF
Kingston's Bridge  | 52°50′56″N 0°16′34″W﻿ / ﻿52.849°N 0.276°W﻿ / 52.849; -0.276﻿ (Kingston's Bridge) | TF162293  | The Twenty Foot Drain is a re-used part of the Lindsey Level works
Donington High Bridge  | 52°54′18″N 0°15′25″W﻿ / ﻿52.905°N 0.257°W﻿ / 52.905; -0.257﻿ (Donington High Bridge) | TF173356  | SFF will be widened from here to Guthram as part of Fens Waterways Link
Eau End  | 52°56′02″N 0°14′31″W﻿ / ﻿52.934°N 0.242°W﻿ / 52.934; -0.242﻿ (Eau End) | TF182388  | The drain to the east was a part of the Medieval Midfen Dyke
Wragmer Stake  | 52°57′22″N 0°13′26″W﻿ / ﻿52.956°N 0.224°W﻿ / 52.956; -0.224﻿ (Wragmer Stake) | TF184413  | The SFF turns to the north east
Bicker Haven  | 52°58′01″N 0°12′07″W﻿ / ﻿52.967°N 0.202°W﻿ / 52.967; -0.202﻿ (Bicker Haven) | TF208426  | The SFF turns east to Boston
North Forty-foot drain  | 52°58′12″N 0°02′42″W﻿ / ﻿52.970°N 0.045°W﻿ / 52.970; -0.045﻿ (North Forty-foot drain) | TF314431  | The junction between the two systems
Black Sluice  | 52°57′58″N 0°01′34″W﻿ / ﻿52.966°N 0.026°W﻿ / 52.966; -0.026﻿ (Black Sluice) | TF326428  | End of the SFF and Site of a new lock

## Water quality[edit]

The Environment Agency measure the water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish. Chemical status, which compares the concentrations of various chemicals against known safe concentrations, is rated good or fail. The South Forty-Foot Drain is designated as "heavily modified", which means that the channels have been altered by human activity, and the criteria for this designation are defined by the Water Framework Directive.[31]

The water quality of the South Forty-Foot Drain was as follows in 2019.

Section | Ecological Status | Chemical Status | Length | Catchment | Channel

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Black Sluice IDB draining to the South Forty Foot Drain[32] | Moderate  | Fail  | 21.6 miles (34.8 km)  | 172.67 square miles (447.2 km2)  | heavily modified

Reasons for the water quality being less than good include physical modification of the channel, which prevents the free movement of fish and other organisms along the waterway, discharge from sewage treatment works, and runoff from agricultural land. Like many waterways in the UK, the chemical status was rated as fail in 2019, due to the presence of polybrominated diphenyl ethers (PBDE) and mercury compounds, neither of which had previously been included in the assessment. Prior to 2019, there were issues with tributyltin compounds being discharged into the system, which also affected chemical status.

## See also[edit]

* United Kingdom portal
* Transport portal

* Canals of Great Britain
* History of the British canal system
* Fens Waterways Link

## Bibliography[edit]

* Darby, H C (1968). The Draining of the Fens. Cambridge University Press. ISBN 978-1-10740298-0.
* Hadfield, Charles (1970). The Canals of the East Midlands. David and Charles. ISBN 978-0-7153-4871-0.
* Miles, W. D. (1976). A History of the Drainage of Bourne South Fen and Thurlby Fen. Welland and Deepings IDB.
* Skempton, Sir Alec; et al. (2002). A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: Vol 1: 1500 to 1830. Thomas Telford. ISBN 978-0-7277-2939-2.
* Sly, Rex (2003). From Punt to Plough - A History of the Fens. Stroud, England: Sutton Publishers. ISBN 978-0-7509-3398-8.
* Wilson, W Eric (1939). Inland Waterways of Great Britain (1st ed.). London, England: Imray Laurie Noray and Wilson.

### References[edit]

1. ^ a b c d e f g h i j k l Staff. "History of the Draining of the Fens in the Black Sluice Area". Black Sluice Internal Drainage Board. Archived from the original on 23 April 2020. Retrieved 18 December 2008.
2. ^ Darby 1968, p. 48.
3. ^ a b Sly 2003, p. 53.
4. ^ a b c Skempton 2002, pp. 209–210
5. ^ Sly 2003, p. 96.
6. ^ Sly 2003, p. 100.
7. ^ Sly 2003, pp. 100, 103.
8. ^ "Future plans for the Black Sluice area". Black Sluice Internal Drainage Board. Archived from the original on 4 March 2016. Retrieved 18 December 2008.
9. ^ "Give your views on Black Sluice area flood management". Environment Agency. 6 March 2015. Archived from the original on 5 September 2019.
10. ^ "Changes to water management in the South Forty Foot Catchment". Black Sluice IDB. 18 October 2018. Archived from the original on 2 March 2021.
11. ^ "Black Sluice & Lock: Project Briefing Note" (PDF). Environment Agency. August 2020. Archived (PDF) from the original on 12 September 2022.
12. ^ Miles 1976
13. ^ "Pumping Stations". The Black Sluice Internal Drainage Board. Archived from the original on 24 October 2020. Retrieved 18 December 2008.
14. ^ "Map of District". The Black Sluice Internal Drainage Board. Retrieved 18 December 2008.
15. ^ Wilson 1939, p. 23.
16. ^ "Fens Waterway Link, Navigation Appendix" (PDF). Environment Agency. p. 14\. Archived from the original (PDF) on 15 February 2012. Retrieved 16 January 2009.
17. ^ a b "Fens Waterways Link Overview". The Inland waterways Association. Archived from the original on 2 June 2011. Retrieved 20 September 2010.
18. ^ "Fens Waterways Link". Environment Agency. Archived from the original on 24 August 2005. Retrieved 19 December 2008.
19. ^ Head Office Bulletin - Issue 134. IWA. March 2008.
20. ^ a b c d e Newsletter 17. Lincolnshire Waterways Partnership. November 2008.
21. ^ Newsletter 18. Lincolnshire Waterways Partnership. March 2009. pp. 10–11.
22. ^ "New moorings for the South Forty Foot". Environment Agency. Archived from the original on 5 June 2009. Retrieved 21 March 2009.
23. ^ a b "Black Sluice Navigation - a guide for river users" (PDF). Environment Agency. Archived from the original (PDF) on 15 February 2012. Retrieved 5 July 2009.
24. ^ Baylis, John (June 2009). "Pioneering voyage on Boston's new waterway". Waterways World. p. 46\. ISSN 0309-1422.
25. ^ Newsletter 15. Lincolnshire Waterways Partnership. March 2008. p. 6.
26. ^ Newsletter 23. Lincolnshire Waterways Partnership. October 2010. p. 12.
27. ^ Newsletter 27. Lincolnshire Waterways Partnership. March 2012. p. 12.
28. ^ Newsletter 28. Lincolnshire Waterways Partnership. Summer 2012. p. 4.
29. ^ Newsletter 31. Lincolnshire Waterways Partnership. Summer 2014. p. 7.
30. ^ Hadfield 1970, p. 97
31. ^ "Glossary (see Biological quality element; Chemical status; and Ecological status)". Catchment Data Explorer. Environment Agency. Retrieved 15 May 2017.
32. ^ "Black Sluice IDB draining to the South Forty Foot Drain". Catchment Data Explorer. Environment Agency. Retrieved 9 January 2022.

## External links[edit]

* "The Easterling" (PDF). Journal of the East Anglian Waterways Association. June 2009. Archived (PDF) from the original on 4 March 2016. "Describing the re-opening of the Black Sluice Lock and giving a detailed history of the South Forty Foot, with photos of the 1910 scouring."

52°50′58″N 0°16′33″W﻿ / ﻿52.8494°N 0.27571°W﻿ / 52.8494; -0.27571

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Navigable canals of the United Kingdom

England|

* Aire and Calder1
* Ashby-de-la-Zouch2
* Ashton
* Basingstoke Canal
* Beverley Beck
* Birmingham Canal Navigations3
* Bridgewater
* Bridgwater and Taunton
* Buckingham Arm2
* Bude2
* Calder and Hebble1
* Cambridgeshire Lodes3
* Chelmer and Blackwater1
* Chesterfield2
* Chichester2
* Coventry
* Driffield
* Droitwich
* Erewash
* Foss Dyke
* Gloucester and Sharpness
* Grand Union3
* Grand Western2
* Grantham2
* Herefordshire and Gloucestershire2
* Hollinwood Branch2
* Huddersfield Broad
* Huddersfield Narrow
* Ipswich and Stowmarket12
* Kennet and Avon1
* Lancaster2
* Leeds and Liverpool3
* Lee Navigation1
* Limehouse
* Llangollen
* Lydney
* Macclesfield
* Maidenhead Waterways
* Manchester Bolton & Bury2
* Manchester Ship Canal
* Market Weighton2
* Middle Level Navigations3
* Montgomery2
* North Walsham & Dilham12
* Nottingham2
* Oxford1
* Peak Forest
* Pocklington2
* Regent's Canal
* Ribble Link1
* Ripon
* Rochdale
* Royal Military Canal
* Sankey2
* Selby
* Sheffield and South Yorkshire13
* Shropshire Union3
* Sleaford12
* South Forty-Foot Drain
* Staffordshire and Worcestershire
* Stort1
* Stourbridge
* Stratford-upon-Avon
* Stroudwater2
* Thames and Medway2
* Thames and Severn2
* Trent and Mersey3
* Weaver1
* Wey and Arun2
* Wey and Godalming1
* Wilts & Berks2
* Witham Navigable Drains3
* Worcester and Birmingham

Northern Ireland|

* Coalisland Canal
* Lagan Canal
* Newry Canal
* Shannon–Erne Waterway
* Strabane Canal
* Ulster Canal

Scotland|

* Caledonian Canal1
* Crinan Canal
* Forth and Clyde
* Union Canal

Wales|

* Llangollen Canal
* Monmouthshire and Brecon2
* Montgomery Canal2
* Neath and Tennant2
* Swansea Canal2

Features|

* Aqueducts (list)
* Basins
* Locks
* Rings
* Tunnels (list)
* Winding holes

Related topics|

* British Waterways
* Canal & River Trust
* Scottish Canals
* History of the British canal system
* Manchester Pusher
* Narrowboats
* National Waterways Museum
* Navigable aqueduct
* Waterways Ireland

Notes: 1 Contains canalised river. 2 Partly or mostly navigable, and/or under restoration. 3 A system of canals. Canals which form part of this system are not listed here individually.
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