The methods reviews are presented in this Occasional Paper. Chapter 2 reviews links between flows and geomorphological forms and processes, the geomorphological impacts of flow regulation, and methods for determination of the flows required for geomorphological purposes. Chapter 3 by Rob McCosker reviews wetland hydrology, water budgets and techniques for determining the flooding requirements of wetland vegetation, followed by a discussion of riparian zone ecology and environmental flow assessment techniques for riparian systems. Chapter 4 reviews methods used to assess the flow requirements of fish, including maintenance of habitat and reproductive processes, flushing flows and fish passage requirements. Chapter 5 reviews the influence of river flows on estuarine fishery production and describes new methods developed to quantify these relationships. Chapter 6 reviews methods for assessing the environmental flow requirements of aquatic invertebrates.