1 : 500 000

Chief Directorate of Surveys and mapping
Institute for Water Quality Studies
GisLAB
(c)1994
(data up to 20 years older) accuracy better than 500 metres

Number of arcs 10 000

Attributes Class = perennial or non-perennial
Name (made consistent along river systems, e.g. "Orange"/"Oranje"
Strahler ordering
Network connections through dams
Some arcs removed for compactness on IWQS copy

Source Chief Directorate of Surveys and Mapping
Department of Land Affairs
Private Bag X10, MOWBRAY 7705

	Chief Directorate of Surveys and mapping Institute for Water Quality Studies GisLAB
(c)1994 (data up to 20 years older)	accuracy better than 500 metres
Number of arcs	10 000
Attributes	Class = perennial or non-perennial Name (made consistent along river systems, e.g. "Orange"/"Oranje" Strahler ordering Network connections through dams Some arcs removed for compactness on IWQS copy
Source	Chief Directorate of Surveys and Mapping Department of Land Affairs Private Bag X10, MOWBRAY 7705

Example of river coverage resolution

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