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keyline design
Keyline design is a technique for maximizing beneficial use of water resources of a piece of land. The ''Keyline'' refers to a specific topographic feature linked to water flow. Beyond that however, Keyline can be seen as a collection of design principles, techniques and systems for development of rural and urban landscapes.
Keyline design was developed in Australia by farmer and engineer P. A. Yeomans, and described and explained in his books ''The Keyline Plan'', ''The Challenge of Landscape'', ''Water For Every Farm'', and ''The City Forest''.
==Application==
P. A. Yeomans published the first book on Keyline in 1954. Yeomans described a system of amplified contour ripping to control rainfall runoff and enable fast flood irrigation of undulating land without the need for terracing.
Keyline designs include irrigation dams equipped with through-the-wall lockpipe systems to gravity feed irrigation, stock water, and yard water. Graded earth channels may be interlinked to broaden the catchment areas of high dams, conserve the height of water, and transfer rainfall runoff into the most efficient high dam sites. Roads follow both ridge lines and water channels to provide easier movement across the land.〔(Keyline Designs website )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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