Table 29. Generalized profile criteria used to differentiate b<strong>et</strong>ween soil drainage groups Drainage group General description and criteria "A" horizons "B" horizons "C" horizons S-1 Fine texture ; fine Fine to medium Fine texture, C; Fine texture, clayey ; blocky to texture, C, SiC coarse blocky C; medium to massive ; lacustrine/ or SiCL ; granular structure . coarse, blocky marine deposits. structure . to massive structure. S-2 Medium to fine tex- Medium texture, Fine to medium Fine to medium ture ; fine loamy L, SiL, CL or texture, C, SiCL, texture, C, SiC, and fine clayey ; SiCL ; platy or CL ; medium to SiCL, CL; blocky to massive; granular coarse, subang- medium to ground moraine till structure . ular to angular coarse, blocky, or lacustrine deposits . blocky structure . prismatic to massive structure . S-3 Medium to coarse Medium to coarse Medium to coarse Fine to medium texture ; coarse texture, L, SL, texture, SCL, L, texture, C, SiC, loamy over fine LS or S ; single SL, S ; fine to SiCL, CL, SCL, clayey or fine grain or weak coarse subangular SiL ; coarse loamy ; blocky subangular blocky structure . angular blocky structure ; shallow structure . structure . water-lain sediments over ground moraine till deposits . S-4 Medium to coarse Medium to coarse Fine to medium Medium texture, texture ; fine loamy ; texture, SCL, texture, C, SiC, L, CL, SiL, SCL, blocky "B" horizon SiL, L, SL, LS, S ; SiCL, SCL; SiCL ; weak that may impede medium granular medium subangular prismatic to internal drainage ; structure . to medium angular blocky structure . ground moraine till blocky structure . or lacustrine deposits . S-5 Organic material Organic Fine to coarse Fine texture, overlying sandy to texture . C; massive . Vlayey particle size ; massive structure; no generalized mode of deposition. S-6 Coarse loamy over Medium to coarse Fine to medium Bedrock . bedrock . texture ; granular texture, C, SiC, structure . SCL ; medium subangular to medium angular blocky structure . G-1 Medium texture ; Medium texture, Medium texture, Medium texture, coarse loamy; L, SiL ; granular L, SiL ; medium L, SiL ; may be blocky to massive structure. subangular stratified structure ; ground blocky structure . coarse subangular moraine tills . blocky to massive structure . G-2 Coarse texture ; Coarse texture, Coarse texture, Coarse texture, sandy ; structureless ; S, SL ; granular S, SL; single S, SL ; single shallow water sediments, structure . grain to medium grain structure, variable in depth, subangular loose. overlying ground moraine blocky structure . tills or lacustrine deposits. G-3 Medium to coarse Medium to coarse Medium to coarse Sand or gravel, texture ; coarse texture, L, SL ; texture, L, SL ; possibly over loamy over sandy granular structure. granular structure . bedrock . skel<strong>et</strong>al ; structureless ; fluvial deposits . 87
(cm) 0- 20 . 40- 60 80- 100- . 0- 20-- 40 -- 601 80 . - 100 120 140-- S-1 Ap B C Surface water gleys Ap B C S-2 Ap G-1 G-2 G-3 Groundwater gleys Figure 46 . Generalized surface water and groundwater soil groupings B C Ap B S-4 Ap B C Fine texture Fine to medium texture Medium texture ' Medium to coarse texture Coarse texture Ap B