APPENDIX I
LIST AND DISCUSSION OF THE DATA SOURCES RELEVANT
WRC WR2005 Data
Updated data from WR90. Same as IWAAS data for Inkomati DWA
Quinary
Catchments A 5th level of catchment boundaries (or quinary catchment boundaries) was developed by the IWAAS project in 2008. These catchments were created for water resources planning needs on the main stem of the primary and secondary rivers and recent attempts by the ICMA to expand river operations into some tributaries has revealed that the quinary catchments need to be updated before the current operational water resources management on the crocodile river can be expanded to the tributaries as they are not of sufficient detail to be used as is.
IWAAS
Remote Sensing Satellite Imagery
SPOT and Landsat Imagery is freely available. The ICMA has signed an agreement with DWA to obtain all SPOT Imagery for the Inkomati.
Various Landsat Images are available for the years 1996, 1998 and 2004 from DWA and the ICMA.
Remote Sensing is a rapidly growing field. New sources of satellite imagery and techniques to derive water resources information from them are available and continue to be refined. To ensure continual learning it is important to keep up with these recent development and where they may improve OWRM. Please refer to section 4.4 for more discussion on this matter.
DWA WRIMS, ICMA
Water Quality Data
The DWA water quality monitoring network and data is available for several chemical and biological indicators at several locations within the Inkomati WMA. The locations of all the monitoring sites area available as well as the national standards for each indicator. These standards have been amended on the Crocodile River to be more strict.
All monitoring is done against these standards and presented at the Crocodile River Forum and CROCOC This monitoring is done on a monthly or bi monthly time step.
DWA WMS System, ICMA
Canals Coverage of all significant canals in the Inkomati is available. These are important to capture as they can divert significant water and the planning and operations models must incorporate these diversions.
DWA
Wetlands A National Wetlands coverage, version 3, is available from SANBI.
The new landcover developed by the ICMA has improved on this and produced a revised wetland coverage. It is also available.
Wetlands can have significant local impacts on runoff and must thus be properly incorporated in to operational models.
SANBI, MWF
Farm
Boundaries The current surveyor general derived cadastral database is outdated.
The ICMA appointed a service provider to update this database in 2013. This data is important as water allocations are issued per farm and it can assist with understanding the actual water use vs. allocated water use of all water users, which is important for water resources planning.
Surveyor General;
ICMA
Irrigation The boundaries and lists of rateable areas for all Irrigation Boards, DWA,
Board Boundaries and lists of Rateable areas
water users associations and government water control areas. This is important to understand the area of responsibility and magnitude of water use allocation under the management of the local water management institutions.
ICMA
Human
settlements Urban and Rural landuse settlements with population data is available from various sources. The various sources of this data differ significantly in their population data. For water demands, the IWAAS water use requirements are currently being used in the operational water resources management. These demands need to be updated.
Statistics SA, DWA
20m and 5m
contours This information has been used by the ICMA to develop a
Hydrologically correct high resolution digital elevation model (DEM). Surveyor General DEM 90m DEM derived from freely available SRTM data is available.
A high resolution DEM was developed by the ICMA in 2013 to enable improved rainfall-runoff and operational modelling. It is yet to be incorporated into the models
ICMA
WARMS
data The Water Authorisations and Registration Management System (WARMS) of DWA contains all the water use allocation data.
However, it is not up to date and is not being used in the models. The verification project of the ICMA will update this information, after which it must be incorporated into WARMS.
DWA
PRIMA
Data A number of reports have been developed by the PRIMA project relating to the International aspects of operational water management of the Incomati system. It is important that these international agreements and operating principles are complied with and any AOWRM is not in conflict with them. The important reports include:
Disaster Management
IWRM
Operating Rules
Institutional arrangements
PRIMA Office, Maputo
Ecological Reserve or Environmen tal Flow Requiremen ts
A Preliminary Comprehensive level Ecological Reserve Determination by DWA. Project WP 9133: Comprehensive Reserve Determination Study for Selected Water Resources (Rivers, Groundwater and Wetlands) in the Inkomati Water management Area, Mpumalanga, is available
The classification of the Rivers must still be done. This will be incorporated as an aspect of the Water Allocation Plan (Chapter 2, Part 2 (S9)(e) and of the NWA) to be done by the ICMA.
More detail on the environmental flow requirement and its implementation in the AOWRMF is given in section 4.1.6.2.
DWA RDM Office