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The required margin (the horizontal part from the outside toe the "invloedslijn" of the dike) depends on the presence of a revetment and is determined by the relation:

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H_onbest is the depth of the channel below the revetment.
M_bestorting is the horizontal projection of the length of the revetment.

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In case no slope protection is present, if over the entire channel depth softening sensitive sand is present, this margin is thus equal twice the fictive channel depth (M = 2 H).
The inclined part of the observation profile in line with the horizontal portion. The inclination of the slope depends on the channel depth:

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