B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
Procede en vue d'ameliorer de maniere permanente le drainage superficiel des terrains, de preference, des terrains couverts d'herbe, et appareil pour la mise en oeuvre de ce procede