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• a slope with or without  flat banks
• the sand type:for
  • very fine sand with  D₅₀ ≤ 200 μm and D₁₅ ≤ 100 μm
  • medium fine sand with
    D₅₀ > 200
  •  200 < D₅₀ ≤ 500 μm and 100 < D₁₅
  > 100
  •  ≤ 250 μm
  for
  • coarse sand and gravel with   D₅₀ > 500 μm and D₁₅ > 250 μm

where D₁₅ and D₅₀ are the minimum averaged values (only for sand and gravel soils) over a thickness of 5 m between the water line and the toe of the channel slope.

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