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Lightning risk assessment for a structure combines

  • A.the colour and material of the roof and nothing else
  • B.the annual rainfall recorded at the site
  • C.the average wind speed measured at the location
  • D.local flash density with the structure's collection area

Answer: D

The collection area grows with height and accounts for flashes that would otherwise have struck nearby. Multiplying by the regional flash density gives an expected strike frequency. The result feeds directly into protection design.

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