critical hydraulic gradientcritical roughness heightcritical sectioncritical slopecritical statecritical streamflowcritical tractive forcecritical vacummcritical velocitycriyccrogcrogenic soilcrop covercrop moisture indexcrop productivitycrop requirementcrop residue managementcrop rotationcrop stages in uslecropping historycross gradingcross sectioncross section areacross sillcross slopecross wavescrossovercrotovinacrowncrown covercrumb structurecrumb testcrust effects and resultscrust formation factorscrust managementcrust sensitivitycrust soil crustcrust typescsu modelcubic splineculitivationculitivatorcull check damcultivated plant covercultural induced erosionculvertculvert flow discharge measurementcumulative infiltrationcumulonimbuscumulose deposit