Last updated Soak Dike, Skeffling; the left bank protects the flat farmland between the Humber and Skeffling village
The term Soak dike is used in The Fens of eastern England to mean a ditch or drain running parallel with an embankment, for the purpose of taking any water that soaks through from the river or drain beyond the bank. In Lincolnshire, sock dyke was formerly a frequently found form of the expression.[1]
The Fens, also known as the Fenlands, are a coastal plain in eastern England. This natural marshy region supported a rich ecology and numerous species, as well as absorbing storms. But most of the fens were drained several centuries ago, resulting in a flat, dry, low-lying agricultural region supported by a system of drainage channels and man-made rivers and automated pumping stations. There have been unintended consequences to this reclamation, as the land level has continued to sink and the dykes must be built higher to protect it from flooding.
England is a country that is part of the United Kingdom. It shares land borders with Wales to the west and Scotland to the north-northwest. The Irish Sea lies west of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight.
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague.
In some parts of the world, the embankment would be called a levee.
A levee, dike, dyke, embankment, floodbank or stopbank is an elongated naturally occurring ridge or artificially constructed fill or wall, which regulates water levels. It is usually earthen and often parallel to the course of a river in its floodplain or along low-lying coastlines.
Peat, also known as turf, is an accumulation of partially decayed vegetation or organic matter. It is unique to natural areas called peatlands, bogs, mires, moors, or muskegs. The peatland ecosystem is the most efficient carbon sink on the planet, because peatland plants capture CO2 naturally released from the peat, maintaining an equilibrium. In natural peatlands, the "annual rate of biomass production is greater than the rate of decomposition", but it takes "thousands of years for peatlands to develop the deposits of 1.5 to 2.3 m [4.9 to 7.5 ft], which is the average depth of the boreal [northern] peatlands". Sphagnum moss, also called peat moss, is one of the most common components in peat, although many other plants can contribute. Soils consisting primarily of peat are known as histosols. Peat forms in wetland conditions, where flooding obstructs the flow of oxygen from the atmosphere, slowing the rate of decomposition.
Silt is granular material of a size between sand and clay, whose mineral origin is quartz and feldspar. Silt may occur as a soil or as sediment mixed in suspension with water and soil in a body of water such as a river. It may also exist as soil deposited at the bottom of a water body, like mudflows from landslides. Silt has a moderate specific area with a typically non-sticky, plastic feel. Silt usually has a floury feel when dry, and a slippery feel when wet. Silt can be visually observed with a hand lens, exhibiting a sparkly appearance. It also can be felt by the tongue as granular when placed on the front teeth.
The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water.
In The Fens, water from the surrounding higher land is carried across the land which lies below high tide level, in embanked rivers. In this way, the need for pumping is reduced. However, the banks are never completely waterproof so that even in an otherwise thoroughly drained fen, the water table near the river bank would be high, reducing the value of the land and weakening the bank.
A pump is a device that moves fluids, or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.
A fen is one of the main types of wetland, the others being grassy marshes, forested swamps, and peaty bogs. Along with bogs, fens are a kind of mire. Fens are minerotrophic peatlands, usually fed by mineral-rich surface water or groundwater. They are characterised by their distinct water chemistry, which is pH neutral or alkaline, with relatively high dissolved mineral levels but few other plant nutrients. They are usually dominated by grasses and sedges, and typically have brown mosses in general including Scorpidium or Drepanocladus. Fens frequently have a high diversity of other plant species including carnivorous plants such as Pinguicula. They may also occur along large lakes and rivers where seasonal changes in water level maintain wet soils with few woody plants. The distribution of individual species of fen plants is often closely connected to water regimes and nutrient concentrations.
The leaky condition of the river embankments usually arose from a difficulty in finding good materials for their construction and from the piecemeal way in which the structures accumulated as the ground shrank or repairs were needed.
The difficulty is overcome by cutting a fairly small ditch, perhaps twenty or thirty metres from the bank, so that it collects the ground water and feeds it to a pump.
Counter drain
Counter drain is another term for much the same thing though in this case, it may have been designed also to deal with water overflowing the river bank. The counter drain would therefore need to be bigger than the soak dike. Counter drain has tended to supersede the other term, particularly in its use as a proper name.
The Counter Drain in Deeping Fen is a good example, where the land between it and the bank of the River Glen was designed as a wash. In other words, the land between the river and the outer bank of the counter drain was originally intended to act as a reservoir in the event of an overflow from the river.[3]
Notes and references
↑ Wheeler, W.H. A History of the Fens of South Lincolnshire (1896). facsimile edn. Paul Watkins, Stamford. (1990) ISBN1-871615-19-4. Appendix IV.
↑ See Oxford English Dictionary. ISBN0-19-861212-5. See soak, substantive, 2.
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