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The relative density term in armour stability formulae is

  • A.the water density divided by the rock density
  • B.the rock density added to the water density
  • C.the rock density divided by water density, minus one
  • D.the rock density multiplied by the density of the water

Answer: C

It expresses the submerged weight available to resist the hydraulic load. A denser rock gives a larger value and therefore a smaller required mass. Density enters the calculation cubed. A modest density gain gives a large mass saving.

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