water infiltration
Fragment of a discussion from Course talk:APBI200/Archive/2016-17WT2
Well there are two types of glacial till - ablation till (which is loose material comprised of particles of various sizes) and basal till (which is cemented, hard and of low permeability for water). And both types happen to be present on our UBC campus. When both types are present, ablation till is on the top of the basal till.