HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Kirkham, D. Search for Related Content PubMed Articles by Kirkham, D. Agricola Articles by Kirkham, D.

Physical Artifices and Formulas for Approximating Water Table Fall in Tile-Drained Land¹

ABSTRACT

Two physical artifices are used to simplify the mathematics of the falling water table in tile-drained land. One artifice is to insert in the soil rigid frictionless, infinitesimally thin, impervious membranes along the natural soilwater seepage streamlines, or along approximate streamlines. The second artifice [one used previously by the author (4)] is to replace soil by gravel in the region above the level of the drain tube centers. The gravel is subsequently, for final derived formulas, replaced by soil. The formulas are shown, theoretically, to be "on the safe side" for drainage design. The formulas agree with experimental data.

¹ Journal Paper No. J-4801 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Project No. 998, Department of Agronomy, work supported in part by Public Health Research Grant No. HEW-WP-00072-02, the U. S. Department of Health, Education, and Welfare, presented before Div. S-1, Soil Sci. Soc. Am., Nov. 20, 1963, at Denver, Colo.

² Professor of Soils and Physics.

Received for publication February 24, 1964. Accepted for publication April 27, 1964.