Volcanoes - Ministry of Civil Defence and Emergency Management
Volcanoes - Ministry of Civil Defence and Emergency Management
Volcanoes - Ministry of Civil Defence and Emergency Management
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ASHFALL IMPACT SCENARIO<br />
300mm (30cm) thickness<br />
All <strong>of</strong> the effects described above, with additional impacts such as:<br />
• Heavy kill <strong>of</strong> aquatic life in rivers <strong>and</strong> lakes.<br />
• Major collapse <strong>of</strong> ro<strong>of</strong>s due to ash loadings.<br />
• Loading <strong>and</strong> breakage <strong>of</strong> power <strong>and</strong> telephone lines.<br />
• Roads unusable until cleared.<br />
Associated Effects<br />
Ashfall has the potential to create additional problems for emergency services <strong>and</strong> other agencies. Some <strong>of</strong> these are:<br />
• Heavy dem<strong>and</strong>s for public information.<br />
• Difficulty <strong>of</strong> movement under ashfall conditions.<br />
• Need for protection <strong>and</strong> ‘ash-pro<strong>of</strong>ing’ <strong>of</strong> emergency service personnel, vehicles, plant, <strong>and</strong> communications<br />
systems.<br />
• Blanketing <strong>of</strong> road <strong>and</strong> street signage, numbers, road markings, hydrants, etc.<br />
• Possible lengthy duration <strong>of</strong> impacts.<br />
• Physical disposal.<br />
• Unfamiliar operational environment.<br />
• Uncertainty over future course <strong>of</strong> events.<br />
Table 1. Effects <strong>of</strong> ashfall (after Tauranga/WBOP District Councils, 2002)<br />
49<br />
TEPHRA<br />
June 2004