Download RAW file: https://library.csbe-scgab.ca/docs/journal/25/25_2_193_raw.pdf
The calculation of spacing for subsurface drains is usually based on isotropic values of hydraulic conductivity (Kirkham et al. 1974). Depositional layering of soils and pedogenic development of horizons would suggest higher values for the horizontal component of hydraulic conductivity, K. On the other hand, vertical dehydration cracks, worm holes and root channels might suggest that the vertical component of K is larger than the horizontal K component near the soil surface. Few data exist which assist in deciding to what extent the soil structural features influence the anisotropy of hydraulic conductivity. In addition, the majority of methods for measuring K for drainage design, such as the auger hole and the piezometer method (Bouwer and Jackson 1974), measure some combination of horizontal and vertical components. Bouwer and Jackson (1974) suggested that by varying the length of the piezometer cavity one can determine the relative magnitude of vertical and horizontal K components. In this study an inflatable device inserted inside an augered hole was used to separate the flow in vertical and horizontal directions. By measuring the rates of flow into the auger hole from the separate directions it was possible to calculate horizontal and vertical components of saturated K. The results of two calculation methods for the horizontal K are com pared to both the results from an unlined augered hole and vertical K for one soil.
a rapid measurement of horizontal and vertical components of saturated hydraulic conductivity
Topp, G. C. and S. Sattlecker 1983. A RAPID MEASUREMENT OF HORIZONTAL AND VERTICAL COMPONENTS OF SATURATED HYDRAULIC CONDUCTIVITY. Canadian Agricultural Engineering 25(2):193-198.
193 - 198