Seite - 1341 - in Book of Full Papers - Symposium Hydro Engineering

PIRQ are considered separately and the highest rating obtained, is accepted. The hazard potential classification is given in Table 2. Table 2 Hazard potential classification Hazard potential rating Potential loss of life Potential economic loss Potential adverse impact on resource quality Low None Minimal Low Significant ≤ 10 Significant Significant High > 10 Great Severe The structural condition of a dam does not influence its category classification (only the size of the dam and its hazard potential are taken into account). There are three categories in the category classification (Category 1, 2 and 3). The relation between the category classification, size class and hazard potential are given in Table 3. Table 3 Category classification of dams with a safety risk Size class Hazard potential rating (*) Low Significant High Small Category 1 Category 2 Category 2 Medium Category 2 Category 2 Category 3 Large Category 3 Category 3 Category 3 (*) Highest level as determined by separate consideration of the potential loss of life, potential economic loss and potential adverse impact on resource quality downstream of the dam To perform any task at a dam (including construction, enlargement, alteration, repair or decommissioning), the owner needs to obtain a licence for construction from the DSO. This normally includes the completion of an application form accompanied with the required design reports and engineering drawings as well as evaluation of the safety of the existing development. For Category 2 dams all tasks must be carried out under supervision of an APP whereas for Category 3 dams, an APP must be assisted by an approved professional team of experts. For Category 1 dams the involvement of an APP is not required but the dam owner has to fulfil the requirements of the dam safety regulations which includes completing an official application form, submitting design reports and engineering drawings and an evaluation of the safety of the existing development. Most of the small dams in South Africa are classified either as Category 1 or 2. In certain instances dam owners have decided to make use of a panel of experts over and above the APP and the accompanying professional team. This in certain circumstances leads to uncertainty regarding professional responsibilities. Once construction is completed for Category 2 or 3 dams, the owner needs to obtain a licence to impound water (this is not required for Category 1 dams). 1341