Titre de série :	Journal of hydrology
Titre :	Drainage of undulating sandy soils with high groundwater tables : I - a drainage formula based on a constant hydraulic head ratio/ II - The variable hydraulic head ratio
Type de document :	texte imprimé
Auteurs :	Ernest, L. F.
Année de publication :	1978
ISBN/ISSN/EAN :	CI-04206
Note générale :	In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..
Mots-clés :	Bassin hydrographique  Eau souterraine  Hydrologie  Débit fluvial  Ruissellement  Sol sableux
Index. décimale :	621.2 Hydraulique : turbines, pompes, accumulateurs, transmission hydraulique
Résumé :	In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..
Note de contenu :	In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..

Journal of hydrology. Drainage of undulating sandy soils with high groundwater tables : I - a drainage formula based on a constant hydraulic head ratio/ II - The variable hydraulic head ratio [texte imprimé] / Ernest, L. F. . - 1978.
ISSN : CI-04206
In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..

Mots-clés :	Bassin hydrographique  Eau souterraine  Hydrologie  Débit fluvial  Ruissellement  Sol sableux
Index. décimale :	621.2 Hydraulique : turbines, pompes, accumulateurs, transmission hydraulique
Résumé :	In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..
Note de contenu :	In the undulating areas in the eastern par of the Netherlands, only the largest drainage channels have a parennial discharge, while the smaller channels have an ephemeral discharge which is considerable in wet periods, but absent in dry periods. The uscial drainage formula cannot be satisfactorily applied in such situations. A considerable improvement can be obtained by taking into account the differences in channel size, the differences in open-water level and the drain density of all drains exceeding a certain bottom depth. The intensity of groundwater flow and open-water flow depends on the differences in height between phreactic surface, open-water level and bottom depth..