Author: Society Of Agricultural Engineers Publisher: Forgotten Books ISBN: 9780666475848 Category : Technology & Engineering Languages : en Pages : 32
Book Description
Excerpt from Measuring Saturated Hydraulic Conductivity of Soils Unfortunately, the choice between methods is seldom black or white, and at the present state of technology there still is much disagreement between experts on the relative merits of many of the methods. Hence this compilation is not to be interpreted as a definitive evaluation, or even a tentative standard. Rather, it should be used as an introduction to the methods available and in common use, with some hints as to their pitfalls and limitations. The serious worker can then turn to the literature references for details on that method which most likely will suit sis needs. The project was initiated with G. O. Schwab as chairman. Cor respondence and personal contact with numerous persons, both mem bers and nonmembers of asae, have contributed to the material here presented.2. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: American Society of Agricultural Engineers. Soil and Water Division. DrainageResearch Committee Publisher: ISBN: Category : Drainage Languages : en Pages : 19
Author: American Society of Agricultural Engineers. Drainage Research Committee. Soil and Water Division Publisher: ISBN: Category : Languages : en Pages : 19
Author: Howard W. Lull Publisher: Forgotten Books ISBN: 9780364422281 Category : Technology & Engineering Languages : en Pages : 64
Book Description
Excerpt from Soil-Moisture Measurement As has been noted, the gravimetric method is the only commonly used direct means of measuring soil moisture. Simply, it involves taking a soil sample, weighing it, oven-drying it, reweighing, and expressing the original moisture content in percent of oven-dry weight of soil. The first step, securing the sample, is the most troublesome, the degree of difficulty depending on the condition of the soil. Sampling conditions are ideal when soil is just moist enough for easy ingress and egress of the sampling instrument, and where stones, roots, and organic matter are not a problem. Such conditions are seldom encountered. With free water in the soil, moisture can never be sampled accurately: water will drip off as the sample is removed from the ground or compaction may squeeze it out. Rapid sampling is essential to prevent undue losses. Stickiness, often a problem in wet soils, can be alleviated by keeping instruments clean. Where a wet layer overlies a dry one, samples taken from the drier levels may be contaminated. After the upper soil is wetted by a summer rain, for instance, removal of a sample may permit water to run down the hole toward drier soil. The same problem is en countered when samples are taken below a perched water table. Wet instruments add to contamination and should be dried between samplings. When the soil is dry and hard, the principal problem in fine textured soils is to get the sampling instrument in and out again. In coarse-textured soils particularly, samples may slide out of the in strument as it is withdrawn from the soil. Fortunately, after the soil dries in summer, its moisture content may fluctuate so little that frequent sampling may be unnecessary. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Society Of Agricultural Engineers
Author: American Society of Agricultural Engineers. Soil and Water Division. DrainageResearch Committee
Author: 
Author: American Society of Agricultural Engineers. Drainage Research Committee. Soil and Water Division
Author: Janneke J. Bouma
Author: Absalom West Snell![A Comparison of Methods for Measuring the Saturated Hydraulic Conductivity of Four Field Soils Having a Range of Textures [microform] PDF](https://books.google.com/books/content/images/frontcover/XuGiwgEACAAJ?fife=w80-h100)
Author: Lee, Doreen M. (Doreen Mary)
Author: Brian D. Riha
Author: Howard W. Lull
Author: Ingmar Messing