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The required margin (the horizontal part from the "invloedslijn" of the dike) depends on the presence of a revetment and is determined by the relation:
M = 2 H Hgeul in case no revetment is present
M = Max [ Mbestorting ; 2 Hgeul) ] in case a revetment is present
where:
Hgeul is the channel depth in case no revetment is present and Hgeul = Honbest in case a revetment is present
Honbest is the depth of the channel below the revetment.
Mbestorting is the horizontal projection of the length of the revetment
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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