This book examines the classification, modelling and environmental implications of catchments and drainage basins. Topics include the importance of viable but non-culturable bacteria in monitoring microbial water quality; regionalizing hydrological soil properties in the Brazilian Cerrado region using a semantic import model approach; ephemeral gully and gully erosion in cultivated land; protection and management of Karst water sources catchments; global fallout from humid and semi-humid basins of the Ob Estuary Macroarena; and developing spatial support systems for monitoring of water quality of the River Isunwin catchment in Nigeria.