Hump and hollow
Encyclopedia
Hump and hollow, occasionally termed "flipping", is a technique of contouring pastures to improve productivity especially on the West Coast
West Coast, New Zealand
The West Coast is one of the administrative regions of New Zealand, located on the west coast of the South Island, and is one of the more remote and most sparsely populated areas of the country. It is made up of three districts: Buller, Grey and Westland...

 of New Zealand.

The technique, used on peat soils and in areas of high rainfall, allows for faster water runoff and lowers the level the water table.
In a three year trial at Kowhitirangi on the West Coast of New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

where the annual rainfall is 3000mm, an improvement of 14% was made when compared with no drainage.

Hump and hollowing is increasingly used on the West Coast and concerns have been raised about the effects on water quality. There is also an effect on soil structure, catchment hydrology, and modifications to habitat.
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