An Investigation of Mole Drain Deterioration and of a Method of Extending Drain Life |
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200 foot drain abbreviated analysis Agric Analysis of Variance APPENDIX blade slit CALIBRATION CURVE causes of mole cent organic matter channel caving channel fill material channel floor chemical analysis chute coarse sand cross-sectional area drain depth drain deterioration drain diameter drainage effects Evidence of channel excavation Figure fingers flow rates foot drain simulation Four Month Old Hopewell 22 Hudson and Hopewell inches investigation irrigation length lined drains lined plus sand lined treatments machine maximum and minimum maximum flow Measuring Mouse method mole channel Mole Drain Experiment mole drain failure mole plow month old mole n.s. Error n.s. Trt observations old mole drains outlet plain drain plain mole drain plastic liner plots presented in Table recording samples sand drains Savage Farm silt Slit width Source of Variation stand count strain gages subsoil surface loading surface soil tensile strength tensiometers upper end water table Wheatstone bridge width at top Zealand