Research Article
Jul 1967
Antecedent Retention Indexes Predict Soil Moisture
Publication: Journal of the Hydraulics Division
Volume 93, Issue 4
Abstract
Two models for calculating antecedent moisture index values are evaluated by comparisons with measured soil moisture. One model, based on the traditional antecedent precipitation index equation, depletes the index values exponentially. The second model depletes the index values by an evapotranspiration-soil moisture relation. Index values computed by the traditional exponential model with recommended K values of 0.88 and 0.92 compare poorly with measured soil moisture. Derived K values show a distinct seasonal trend and range from 0.98 in the spring and fall to 0.92 in the summer when representing the 0- to 12-in. soil depth, and 0.98 to 0.96 when representing the 0- to 36-in. soil depth. Index values by both models compare favorably with available soil moisture when derived K and PET values are used. The K and PET values are related to pan evaporation to facilitate their prediction at other locations.
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Information
Published In
Journal of the Hydraulics Division
Volume 93 • Issue 4 • July 1967
Pages: 223 - 244
Copyright
© 1967 American Society of Civil Engineers.
History
Published in print: Jul 1967
Published online: Feb 3, 2021
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Authors
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Keith E. Saxton, A.M.ASCE
Research Hydr. Engr., Soil and Water Conservation Research Div., Agri. Research Service, U. S. Dept. of Agric., Columbia, Mo
Arno T. Lenz, F.ASCE
Prof. of Civ. Engrg., Univ. of Wisconsin, Madison, Wis
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.