Environmental flows: Downstream response to imposed flow transformations (DRIFT)

Abstract

DRIFT (an acronym for Downstream Response to Imposed Flow Transformations) is an interactive, holistic scenario-based environmental flow assessment method. It consists of procedures and software developed in South Africa to predict the expected ecological and socioeconomic implications of proposed water-resource management activities. Its outputs complement the engineering and economic information usually available on such activities and so DRIFT helps provide a more balanced picture of the full suite of costs and benefits linked to water resource proposals. Using scenario analysis, DRIFT can address the different options for location, design, and operation of a specific dam; rehabilitation of a river; or any other management activities that could affect the flow or inundation patterns of inland waters. DRIFT is increasingly applied in basin-wide strategic planning exercises. Training courses are available.