Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525607
Title Grondwaterstroming in komgrond en de bepaling van enige hydrologische grootheden in verband met het ontwateringssysteem
Author(s) Hoorn, J.W. van
Source University. Promotor(en): F. Hellinga. - Wageningen : Pudoc - 136
Department(s) Centraal Instituut voor Landbouwkundig Onderzoek
Publication type Dissertation, internally prepared
Publication year 1960
Keyword(s) drainage - bodemtaxonomie - bodemclassificatie - bodemtypen - bodemwater - grondanalyse - zware kleigronden - nederland - grondwaterwinning - soil taxonomy - soil classification - soil types - soil water - soil analysis - clay soils - netherlands - groundwater extraction
Categories Agrohydrology / Hydrology
Abstract The basin clay soil occupying an extensive area between the great rivers in the Netherlands is characterized by a profile with a highly permeable surface layer (20 cm) over a poorly permeable second layer (50 cm, K = 0.05 metre/ day) and a highly permeable subsoil (KD) = 1 metre 2/day). In this profile, a deep discharge in vertical direction through the second layer and in horizontal direction through the subsoil takes place. A shallow discharge in horizontal direction may occur, through the surface layer. There is surface run-off under special conditions.
The occurrence of shallow discharge is determined by the relation between precipitation rate and infiltration capacity of the second layer. When the watertable remains below the top of this second layer, infiltration occurs in unsaturated soil, since infiltration capacity exceeds or practically equals the hydraulic conductivity of the second layer. But when the watertable reaches the top of the second layer, infiltration capacity becomes equal to the discharge rate of the drainage system in the highly permeable subsoil. The lower the initial watertable in the subsoil at the start of a rainy period, the longer the rain has to infiltrate into an unsaturated soil.

Good drainage can be achieved under the rainfall of the Netherlands with an adequate system of ditches and tile lines only if in the highly permeable subsoil, so reducing radial resistance. Otherwise trench drains must be used.
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