supercoold cloudsupercoold watersupercooled fogsupercooled rainsupercritical flowsuperdiabatic lapse ratesupergeostrophic windsuperheated steamsuperimposition principlesupernatentsuperpositionsupersaturationsupplemental irrigationsupplemental pasturesupplemental watersupportsuppressed measuring weirsurcharge storagesurfacesurface boundary layersurface crustingsurface curvesurface detentionsurface eddiessurface erosionsurface flowsurface hoarsurface observationsurface pondingsurface runoffsurface sealingsurface slopesurface soilsurface storagesurface storm flowsurface tensionsurface velocitysurface vortex diametersurface washsurface watersurgesurging flowsuspedoidssuspended frame weirsuspended loadsuspended load samplersuspended mattersuspended sedimentsuspended watersuspended water zone