Download RAW file: https://library.csbe-scgab.ca/docs/journal/17/17_2_110_raw.pdf
Reclamation of waterlogged, salt affected soil requires removal of excess water and salt from the root zone. In arid and semiarid climates, it has been generally agreed that the water table should be lowered to a depth of 150 cm or greater (6, 8, 9). This depth is greater than that of the normal root zone but has been considered necessary to prevent resalinization of the reclaimed soil through capillary movement. To lower the water table to this depth, usually the drains must be placed deeper still (6). Costs and problems of installing drains increase with depth of installation. Thus it is advantageous to install the drains as shallow as practicable. It is recognized that groundwater flow toward drains is radial where the soil is isotropic and the impermeable layer is deep (2, 4, 7, 9), that is, the flow lines extend below the depth of the drains. The depth of radial flow is a function of drain spacing, depth to the impermeable layer, soil permeability, and soil isotropy (9). Therefore, it might be feasible, with shallow drains, to lower the water table sufficiently to permit normal root activity, to flush out excess salts to depths somewhat lower than the drain, and, by careful management, to prevent resalinization. This proposition was tested on a field scale in a semiarid continental climatic zone (3) at Vauxhall, Alberta.
use of shallow drains to reclaim a saline soil
Sommerfeldt, Theron G. and N. Paziuk 1975. USE OF SHALLOW DRAINS TO RECLAIM A SALINE SOIL. Canadian Agricultural Engineering 17(2):110-113.
110 - 113