Evaluation of subsurface drainage in promoting soil strength for field operations in southern Manitoba
Authors: Mante, Afua; Sri Ranjan, Ramanathan
Description: The soil strength of drained and undrained fields in Southern Manitoba was compared to evaluate subsurface drainage in promoting soil strength for field operations in Southern Manitoba. The subsurface drain tile was installed at 0.9 m depth and at 15 m spacing. Consistency index, a measure of the resistance of the soil to deformation, was used to assess the strength of the top 0.5 m of the soil profile. Susceptibility and vulnerability assessments were used to assess the strength of the subsoil at 0.6 m depth of the soil profile. A consistency index of 0.75 was used as the criterion to assess the suitability of the soil to allow field operations. The consistency index analysis showed that irrespective of the watertable depth, the subsurface drained field did not lower the water content sufficient to promote soil strength suitable for field operations in the study area. This was attributed to an impeding layer, which prevented free drainage of water through the soil profile towards the drain. The impeding layer caused higher water content in the top 0.6 m of the soil profile making it highly susceptible and very vulnerable to compaction.
Keywords: soil water content; watertable depth; subsurface drainage; soil strength; consistency index.
Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Session 1B: Sustaining Water and Soil Quality
Publisher: Canadian Society for Bioengineering
Language 1: en
Rights: Canadian Society for Bioengineering