sabath, safe yield, safe yield of stream, safety line, saline spring, saline water, salinity stratification, salt dome, salt karst, salt lake, salt tolerance, salt weathering, saltation, saltation load, saltwater intrusion, sampling, sand, sand pipe, sand stalagmite, sandstone caves, saprophage, saturated, saturated flow, saturated water, saturated zone, saturation regime, saturation, zone of, scale, scaling chip, scaling factor, scaling plate, scaling poles, scallop, scar, scats, scavenger, Schichtfugenkarren, scholzite, scour, screen, screen pipe, sea cave, sea estavelle, sea level, sea ponor, sea water intrusion, sea-mill, sealing-grout, grout, secondary interstices, secondary porosity, section, sediment, sediment transport, sedimentation, seep, seepage, seepage face, seepage force, seepage line, seepage path, seepage rate, seepage spring; filtration spring, seepage surface, seepage velocity, seepage water, selenite, selenite needles, self-cleaning capacity, semiconfined aquifer, sepiolite, series, setting of cement, settling basin, settling velocity, sewage, shaft, shake; shakehole, shall sand, shawl, shear plane, shear stress, sheet, sheet erosion, sheet jointing, shield; cave shield, shilin, shore, show cave, sieve analysis, sieve opening, sieve retention, silicate rock, silicic acid, silicon dioxide, Silikatkarren, silt, silting, sima, similarity criteria, simple hydrograph, single outlet, single rope technique, sink; sinkhole, sinkhole plain, sinkhole pond, sinking river, sinking stream, sinter, siphon, site characterization, skin effect, skryty karst, zakryty karst, skylight, slickenside, sliding, sling, slocker, slope, slump pit, smithsonite, snow, snow cover; snowpack, snow line, snow sampler, snowdrift, sod, soda straw, soddy karst, sodium, soil aggregate, soil air, soil bulk density, soil mechanics, soil moisture, soil profile, soil sample, soil swelling, soil water, soil-covered karst, soil-moisture meter, soil-moisture suction, soil-water pressure, soilcover, soilwater zone, solid matrix, solid volume, solifluction, solubility, solum, solute, solute transport, solution, solution breccia, solution flutes, solution lake, solution notch, solution pan, solution pipe, solution runnel, solution scarp, solution subsidence, sonar, sorption, sotano, spangolite, species, specific capacity, specific conductance, specific discharge, specific drawdown, specific gravity, specific retention, water retaining capacity, specific storage, specific surface, specific yield, spelean, speleogen, speleogenesis, speleogenetics, speleologist, speleology, speleothem, spelunker, spelunking, spencerite, sphalerite, spillway, Spitzkarren, Spitzkegelkarst, splash cup, spongework, spongework cave pattern, spontaneous potential, spore tracer, spring, spring head alcove, spring, artesian, spring, barrier, spring, boiling, spring, boundary, spring, cave, spring, contact, spring, depression, spring, drowned, spring, ebb-and-flow; ebbing-and-flowing well, spring, fracture, spring, fullflow, spring, gravity, spring, intermittent, spring, karst, spring, medicinal, spring, mineral, spring, overflow, spring, perched karst, spring, perennial, spring, periodic, spring, saline, spring, seepage, spring, subaqueous, spring, sublacustrine, spring, submarine, spring, thermal, spring, tubular, spring, unconformity, spring, underflow, spring, valley, spring, vauclusian; rising, vauclusian, squeeze, staff gage, stage, stage hydrograph, stage record, stage-discharge relation, stagmalite, stagnation point, stalactite, stalagmite, stalagmite, capillary, standard deviation, standing line, state of solution, static head, static water level, station, steady flow, steam hole, steep, steephead, stegamite, stemflow, stereo aerial photographs, stereogram, stilling well, stomatal transpiration, stone forest, stoping, storage capacity, storage coefficient, storage gage, storage in depressions, storativity, storm, strath terrace, stratification, stratigraphic column, stratigraphic sequence, stratum, straw stalactite; straw, stream, stream bed, stream development, stream flow, stream frequency, stream order, stream profile, stream sink, streamsink, stream tube, streamline, streamtube, strength, stress, stress, applied, stress, effective, stress, geostatic, stress, neutral, stress, preconsolidation, stress, seepage, stress, shear, strike, strike valley, structural factor, structural geology, structure, struga, stygobite, stygophile, stygoxene, stylolite, sub-conduit, subaqueous karst, subaqueous spring, subartesian well, subcutaneous drain, subcutaneous flow, subcutaneous zone, subfluvial karst, subjacent karst, subkutan karst, sublacustrine spring, sublimation, submarine karst, submarine spring, subpermafrost karst, subpermafrost water, subsequent river, subsidence, subsidence doline, subsidence/head-decline ratio, subsoil karst, subsurface divide, subsurface flow, subsurface runoff, storm seepage, subsurface flow, subsurface storm fl, subsurface water, subterranean, subterranean cut-off, subterranean river, subterranean stream, suction, suffosion, suffosion doline, sulfate, sulfate minerals, sulfate-reduction karst, sulfide, sulfide minerals, sulfuric acid, sumidero, summation curve, summit, sump, sunken pan, superimposed valley, supersaturated, supersaturation, suprapermafrost karst, suprapermafrost water, surf karren, surface detention, surface entry, surface film, surface mapping, surface mine, surface retention, surface runoff, surface seepage, surface spreading, surface tension, surface water, surfactant, survey, susica, suspended load, suspended matter, suspended water, sustained yield, suunto clinometer (registered TM), suunto compass (registered TM), swale, swallet, swallow hole, swelling, swelling rate, swirlhole, synclinal valley, syncline, syngenetic karst, syngenite, synoptic network, synthetic unit hydrograph,