Environmental Flow Requirements of the Fish River and the Orange-Senqu River Mouth


The Orange-Senqu River riparian States (Botswana, Lesotho, Namibia and South Africa) are committed to jointly addressing threats to the shared water resources of the Basin. This is reflected in bilateral and basin-wide agreements between the riparian states and led to the formation of the Orange-Senqu River Commission (ORASECOM) in 2000.

The ‘Orange-Senqu Strategic Action Programme’ Project supports ORASECOM in developing a basin-wide plan for the management and development of water resources, based on Integrated Water Resources Management (IWRM) principles.

The water resources of the Orange-Senqu River are heavily utilised and the system is highly regulated with 23 major dams within its Basin. It is also connected to other river systems for water import and export via six inter-basin water transfer schemes.

The project presented here addresses Environmental Flow Requirements (EFR) of the ephemeral but nevertheless significant Fish River, and the Orange-Senqu River, from its confluence with the Fish River downstream to the Orange-Senqu River mouth.

This section of the basin has not been covered in any detail by the earlier studies carried out during 2009-2010. The need for establishing the Environmental Flow Requirements is becoming increasingly` urgent due to the fact that two large dams, one in the Lower Orange (Vioolsdrift Dam) and one in the Lower Fish (Neckartal Dam), are at an advanced state of planning.

Project's on-line map

Project's on-line map presents all spatial data generated during the project. The map is hosted on the WIS geoserver system. The map provides interactive access to spatial data and attribute data associated with spatial features.

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Below are all data sets generated within the project. GIS data asociated with these datasets can be accessed either through the on-line map or through the "map" link under each dataset

Ecostatus Assessment Indices

Scenario Ecostatus Assessment

Raw Ecological Data

Hydrological Data

Water Quality and Sediment Data



These are project maps included in the project reports. All are in jpg format. GIS data underlying them are shown elsewhere in this page