Titre :
|
Impact of improved land drainage on river flows
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Auteurs :
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M. Robinson ;
INSTITUTE OF HYDROLOGY, WALLINGFORD
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Type de document :
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rapport
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Editeur :
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Wallingford, Royaume-Uni : Institute of Hydrology, 1990
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Collection :
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Report IH n°113
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Format :
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226
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Langues:
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= Anglais
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Catégories :
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EAU
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Mots-clés:
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DRAINAGE AGRICOLE
;
MODELISATION
;
ECOULEMENT
;
DEBIT DE CRUE
;
RESEAU DE DRAINAGE
;
BASSIN VERSANT
;
SOL LOURD
;
PREVISION DE CRUE
|
Résumé :
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A central part of this report has involved assembling a nationwide set of data from both published and unpublished field drainage experiments where flows were measured from both drained and undrained lands. It was found that, in contrast to previously expressed opinions, the drainage of heavy clay soils generally results in a lowering of large and medium flow peaks. On more permeable soils, the more usual effect of drainage is to improve the speed of subsurface discharges, tending to increase peak flows. Studies of flow records from individual catchments indicate that the combined effect of field drainage and arterial works is to increase streamflow peaks whether or not maximum flows are increased or decreased at the field scale. At the regional scale artificial drainage was a statistically significant parameter shortening catchment response times.
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