Minimal length (curvilinear longitudinal extent measured along the river central axis) of sampling points, after Belliard et al. (2012). Reading: for rivers between 3 and 30 m wide, the length of the sampling point has to exceed twenty times its mean wetted width.
|Mean wetted width (MWW)||Minimal length of the sampling point|
|<3 m||60 m|
|From 3 m to 30 m||20 × MWW|
|From 30 m to 60 m||600 m|
|>60 m||10 × MWW|
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