Root Zone Moisture Routing and Water Demand Calculations in the Context of Integrated Hydrology
Publication: Journal of Irrigation and Drainage Engineering
Volume 137, Issue 6
Abstract
An important issue that integrated hydrologic models (IHMs) for river basins can address is the management of water resources in heavily inhabited and cultivated basins. To address this issue, these models need to simulate water demands and root zone flows in a basin. Irrigation scheduling models (ISMs) have been widely used by professionals to compute farm level water demands and root zone flows. Available ISMs are neither suitable for use at basin scale nor can they be easily linked to IHMs. This paper describes a new model that utilizes methods used by ISMs to compute root zone flows and water demands in river basins and can be linked to IHMs. The model was applied to a basin in California, and the simulated water demands were compared with data compiled for the basin. The differences in the results were attributed to differences in input potential evapotranspiration rates. The paper demonstrates that simulated water demands for rice are very sensitive to saturated soil hydraulic conductivity, whereas demands for other crops are sensitive to the pore size distribution index.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 137 • Issue 6 • June 2011
Pages: 359 - 366
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 22, 2009
Accepted: Oct 21, 2010
Published online: Oct 26, 2010
Published in print: Jun 1, 2011
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