[Some considerations on the investigation in erosion]

bassin versant eau de ruissellement environmental impact escorrentia evaluation impact sur l'environnement impacto ambiental infiltration land use lluvia measurement mesure methode methods organic matter permeabilidad permeability planification planning pluie rain recherche research runoff simulation models soil texture soil water retention textura del suelo texture du sol utilisation des terres venezuela water erosion watershed management watersheds