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 311470
Title Drainable Surplus Assessment in Irrigated Agriculture: Field Application of the Groundwater Approach
Author(s) Boonstra, J.; Bhutta, M.N.; Rizvi, S.A.
Source Irrigation and Drainage Systems 11 (1997)1. - ISSN 0168-6291 - p. 41 - 60.
Department(s) International Institute for Land Reclamation and Improvement
Publication type Refereed Article in a scientific journal
Publication year 1997
Keyword(s) drainage door leidingen - buisdrainage - bodem - natrium - verbetering - verzilting - grondwateraanvulling - hydrologie - modellen - analogen - pipe drainage - tile drainage - soil - sodium - improvement - salinization - groundwater recharge - hydrology - models - analogues
Categories Agrohydrology
Abstract To assess the drainable surplus of an irrigated area, a methodology based on a groundwater-balance approach was developed and applied in Schedule I-B of the Fourth Drainage Project near Faisalabad in Pakistan. To determine the seasonal net recharge in this area, a numerical groundwater model was run in inverse mode. The data input for the model consisted of the geometry of the aquifer system, the aquifer parameters, and historical watertable elevations. The seasonal net recharge values, calculated from the individual recharge and discharge components, were "tuned" with the results of the inverse modelling. The advantage of such an integrated approach is that all these components are linked. The design net recharge was estimated from the historical net recharge of the wettest monsoon in the study period. Its rainfall recharge values were then substituted for those of a design monsoon. In this substitution procedure, the rainfall recharge methodology and parameters were adopted from the tuning procedure. From this design net recharge, estimates could be made of the required drainable surplus, with and without drainage simulation.
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