A highly informative guide designed for anyone involved in fresh water conservation, environmental monitoring, aquatic biology, or water-resource management. The book explains how South African rivers are classified, how their ecological health is assessed, and which biological, chemical and physical indicators are used to measure river condition. It provides practical tools and frameworks for evaluating river systems, supported by clear explanations, charts and real-world examples. From macro-invertebrate indices to water quality parameters, this guide helps readers understand how to interpret environmental data and assess the overall health of aquatic ecosystems. Well-structured, scientifically sound and easy to reference – an essential resource for students, conservationists, environmental consultants and anyone working with fresh water habitats. Good condition. Softcover, a mammoth work at 29cm x 20,5cm, 417 pages.