Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Version

Published Version

Publication Date

1994

Journal or Book Title

Applied Engineering in Agriculture

Volume

10

Issue

1

First Page

65

Last Page

68

DOI

10.13031/2013.25829

Abstract

Saturated hydraulic conductivity (Ks) is an important parameter influencing subsurface drainage design and performance, and Ks can be affected by subsurface drain installation methods. Ks was measured at a field site at Nashua, Iowa, with 1.2-m (4-ft) deep drain lines installed with a trenchless plow and with a chain trencher at four depths [0 to 150, 150 to 450, 450 to 750, 750 to 1000 mm (0 to 6, 6 to 18, 18 to 30, 30 to 40 in.)] using the Guelph permeameter (in situ technique) and the constant head permeameter method (laboratory technique) on undisturbed soil cores which were removed from the field site. Ks values were 10 to 130 times greater for the constant head permeameter compared to the Guelph permeameter method and were significantly different at all depths for the two measurement methods. The laboratory technique yielded greater standard deviation values for all depths, whereas the coefficient of variation values were greater for the in situ technique. Drain line installation methods did not significantly affect Ks at the 0 to 150 and 150 to 450 mm (0 to 6 and 6 to 18 in.) depths; however, at the 450 to 750 and 750 to 1000 mm (18 to 30 and 30 to 40 in.) depths, the trencher installation method had Ks values two to three times greater than the trenchless installation method and these differences were significantly different. Subsurface drain line installation method can affect the Ks values particularly near the drain line depths; however, these affects did not affect drainage system performance 10 years after installation.

Comments

This article was published in Applied Engineering in Agriculture. 10(1): 65-68. doi:10.13031/2013.25829. Posted with permission.

Access

Open

Copyright Owner

American Society of Agricultural and Biological Engineers

Language

en

File Format

application/pdf

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