Environmental flow assessments & classification

We offer specialist expertise for classifying and determining the freshwater requirements of rivers and estuaries, including socio-economic components. We also offer the design and use of analytical tools for integrated river basin management, including DRIFT, systems modelling and classification.

Project Profiles

Flows for people and the environment: Tanzania

Flows for people and the environment: supporting sustainable land management in the Pangani Basin.
International Conservation Union (IUCN)/Pangani Water Basin Office
Tanzania

The five-year study entailed quantitative ecological and socio-economic survey methods, stakeholder engagenemtn, development of a modelling tool for the analysis of scenarios, and mentorship of a team of Tanzanian ecologists economists, and water resource managers. The project was successfully completed, and outputs are being utilised by the Pangani Basin Water Office. The project has been used as an example in many publications, including the TEEB.

Classification of Breede-Gouritz Water Management Area resources

Classification of water resources of the Breede-Gouritz Water Management Area. 
Department of Water and Sanitation, through Aurecon
South Africa

The Water Resource Classification System classifies water resources according into Management Classes that determine the characteristics of a water resource (all significant rivers, wetlands and estuaries and groundwater resources) that are required by both DWS and society. For the Breede-Gouritz WMA, the process involved describing current water use and the value of aquatic ecosystems, describing the relationships between flows and ecosystem condition, developing predictive models and analyzing a range of possible classification scenarios in which different amounts of water are reserved for the environment. The results were analysed together with stakeholders in a structured multi-criteria decision process before settling on a final Class configuration for the WMA.

Environmental flows assessment for the Klein River Estuary

Environmental flows assessment for the Klein River estuary, South Africa.
Cape Nature
South Africa

This study was commissioned to determine the Ecological Reserve for the Klein River estuary, which entails following a set of procedures to determine the Present Ecological Status (health state), the Recommended Ecological Category (the future state of health) and the quantity and quality of freshwater inflows and other conditions required to maintain this. 

Environmental Flow Assessment for the Uilkraals Estuary

Determination of the ecological water reserve for the Uilkraals estuary
Cape Nature
South Africa

This study was commissioned to determine the Ecological Reserve for the Uilkraals estuary, which entails following a set of procedures to determine the Present Ecological Status (health state), the Recommended Ecological Category (the future state of health) and the quantity and quality of freshwater inflows and other conditions required to maintain this. The analysis involved estimating the characteristics of the system in its original condition as well us under a range of potential future scenarios.

Environmental Flow Assessment for the Berg Estuary

Comprehensive determination of the Environmental Water Requirements for the Berg River Estuary.
Department of Water Affairs
South Africa

Anchor was appointed to undertake a comprehensive reserve determination (flow assessment) study to assess the present ecological status of the Berg estuary, and the potential impacts of various alternative flow scenarios on the ecological health and functioning of the system. The project entailed the preparation of a high resolution Digital Elevation Model of the estuary and associated floodplain areas, the setting up of a detailed hydrological and hydrodynamic models for the system, the simulation of present day, naturalised, and a range of operation flow scenarios, and estimating the responses in abiotic (water quality and sediment), biotic (microalgae, macroalgae, vegetation, invertebrates, fish and birds), and socio-economic (subsistence, property, tourism, nursery, and existence value) response variables. The project recommendations are being implemented in terms of flow releases from the Berg River Dam and the management plan for estuary.