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Catchwater drains may take the form of concrete canals, such as in Hong Kong, where there are many.Alternatively, they may take the form of a large concrete sheet, smothering a hill, and preventing rainfall from entering the rock strata, with a smaller channeling system for transport of the water to the storage tank - this latter system is in operation in Gibraltar.
A catchwater drain is a land drain, a ditch cut across the fall of the land, typically just above the level of low-lying, level ground such as The Fens of eastern England, where some land, tens of kilometres from the sea is at about sea level. Its purpose is to gather water draining from the higher, sloping ground before it reaches the flat ...
Mound systems are an alternative to the traditional rural septic system drain field. They are used in areas where septic systems are prone to failure from extremely permeable or impermeable soils, soil with the shallow cover over porous bedrock, and terrain that features a high water table.
The principal engineering works were the West Fen Catchwater Drain, a 13.4-mile (21.6 km) channel around the northern edge of the West Fen; the East Fen Catchwater Drain, a 9.4-mile (15.1 km) channel around the northern edge of the East Fen; the Stonebridge Drain, a 4.2-mile (6.8 km) channel which connected Cherry Corner to Cowbridge; upgrading ...
In 1839, a novel method of clearing silt and maintaining the navigation was employed on the lower reaches of the drain. A machine known as a Floating Clough was positioned on the drain below where Patrington Haven entered the Winestead Drain. The machine was made of timber with various wooden projections sideways and longways which had serrated ...
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 ...
The Act enabled the North District to build a cast iron tunnel under the Fossdyke Navigation and a new drain to convey the water to the Main Drain of the South District. Additionally, they could build a catchwater drain along the edge of the higher ground to the east, which would discharge into the Fossdyke.
A hybrid system using Flowforms in a passive treatment pond, in Norway. There are many types of water treatment systems available for removing metals from acid mine drainage. Passive treatment systems are a relatively recent technology that involves using sulfate-reducing bacteria or limestone or both to neutralize acidity and precipitate metals.
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