Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Abstract Subsurface drainage annual rate boomed in France in late 70s and reached a steady rate of 130 000 hectares in 1982. As a consequence, better knowledge of drainage requirements, techniques and effects on farm management is requested. Emphasis has been put on preliminary survey planning. First of all extension and location of areas to be drained is determined with the help of farmers and local representatives within so-called “local juries”. Secondly, drainage recommandations are derived using the so-called “soil reference area” method. Drainage criteria and design methods are discussed on the basis of recent field experimental results. Drain spacing computation is related to tail recession stage; soil hydraulic properties are measured in situ using Guyon's pumping test. Subsurface and arterial drainage design rate are related to discharge exceedance duration curves and annual level of protection.
Abstract Subsurface drainage annual rate boomed in France in late 70s and reached a steady rate of 130 000 hectares in 1982. As a consequence, better knowledge of drainage requirements, techniques and effects on farm management is requested. Emphasis has been put on preliminary survey planning. First of all extension and location of areas to be drained is determined with the help of farmers and local representatives within so-called “local juries”. Secondly, drainage recommandations are derived using the so-called “soil reference area” method. Drainage criteria and design methods are discussed on the basis of recent field experimental results. Drain spacing computation is related to tail recession stage; soil hydraulic properties are measured in situ using Guyon's pumping test. Subsurface and arterial drainage design rate are related to discharge exceedance duration curves and annual level of protection.
Drainage design practices in France
Lesaffre, B. (Autor:in)
1989
Aufsatz (Zeitschrift)
Englisch
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