Marwan Alhaj Houssein*(1)
(1). Department of Rural Engineering, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.
(*Corresponding author: Dr. Marwan Alhaj Houssein. E-Mail: marwanhaj1958@yahoo.com).
Received: 11/05/2020 Accepted: 09/06/2020
Abstract
The present experimental work was carried out at the Irrigation and Drainage Research Laboratory, Rural Engineering Department, Faculty of Agriculture, University of Aleppo. Box model was designed in this study to compare the measured flow with calculated one of absorbent wells. The results showed that the use of Darcy permeability coefficient in Dupuit equation is inappropriate, in which the calculated flow was less than the measured flow by 24.0 to 29.3%. Therefore, the variations of the permeability coefficient were studied according to the movement of water towards the wells by tracing the level of ground water in the observing tubes and piezometers. The results confirmed that the permeability values resulting from the exudation distance are more consistent with theoretical studies comparing with results that depended on the water level in the well. However, the permeability value for the case of the water level in the well Kber1 ranged from 0.015 to 0.018 cm/min, whereas the permeability value based on the distance of the exudation in the locations far from the axis of the well Kber2 was 0.029 cm/min approximately, but in a near location, it was 0.047 cm/min. The study also showed that there was a good agreement between the measured flow and calculated one, therefore the results obtained in the present study can be relied upon to estimate the flow of absorbing wells for such soils.
Key words: Agricultural drainage, Ground water level, Ddrainage wells, Permeability.