Drainage of Sloping Lands with Variable Recharge Model Validation and Applications
Publication: Journal of Irrigation and Drainage Engineering
Volume 129, Issue 4
Abstract
Semianalytical transient equations describing the behavior of water tables in subsurface drained soils when drains rest on a sloping impervious barrier have been derived previously and represent the bases of the SIDRA model. To validate (SIDRA), water table elevations and drainflow rates have been monitored for six years in the French Alps on fields with a slope of 8%. The predicted drain flow rates and water table shapes compare reasonably well with data of a drainage experiment site but the improvement provided by taking the slope into consideration was limited. Running the model with different slopes confirmed that high water table elevations and peak flows were not significantly changed with a slope of 8%. As could be predicted from the analysis in steady state, low water table elevations were the most affected by slope. With the soil parameters of the field experiment and from an analysis in tail recession conditions, it was shown that there is a clear threshold of 12% slope below which the slope has no significant influence and can be neglected in drainage design.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 129 • Issue 4 • August 2003
Pages: 284 - 290
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Apr 8, 2002
Accepted: Oct 3, 2002
Published online: Jul 15, 2003
Published in print: Aug 2003
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