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Table J29: Size classification of dams with a safety risk.
Size class Maximum wall height
(m)
Small More than 5 m butless than 12 m
Medium Equal to or more than 12 m but less than 30 m
Large Equal to or more than 30 m
111I11I!1111111
Source: AfterAnonymous, 1986. Reoublic ofSouth Africa Government Gazette No.
10366 of the 25th July 1986. Government Printer, Pretoria, 28 p.
(Government Regulation Notice GN R1560/86).
The classification of dams (with a safety risk) by hazard potential is outlined in Table J30.
The hazard potential rating for a particular dam is set at the highest level as determined
by the potential loss of life and potential economic loss. Classification is based on the
possible failure of the dam, without warning, on a normal sunny day. The final
classification ofdams with a safetyrisk (incorporating the relevant parameters), is provided
in Table J31.
Table J30: Hazard potential classification of dams with a safety risk.
Hazard potential rating Potential loss of life Potential economic loss
Low None Minimal
Significant Not more than 10 people Significant
High More than 10 people Great
Source: AfterAnonymous, 1986. Republic ofSouth Africa Government Gazette No.
10366 of the 25th July 1986, Government Printer, Pretoria, 28 p.
(Govemment Regulation Notice GN R1560/86).
Note: For classification purposes, potential economic losses of less than R1 million
and more than R10 million are considered "minimal" and "great"
respectively (1986 prices).