See Also...201 107 ISOM Index Land forms index previous next
revision
05/00
106 Earth bank
A steep earth bank is an abrupt change in ground level which can be clearly distinguished from its surroundings, e.g. gravel or sand pits, road and railway cuttings or embankments. The tags should show the full extent of the slope, but may be omitted if two banks are close together. Impassable banks should be drawn with symbol 201 (impassable cliff). The line width of very high banks may be 0.25mm
Colour: brown.
Line width 0.18mm or 0.25mm (tag line width 0.14mm)
tag length 0.5mm, spacing 0.5mm
A steep earth bank is an abrupt change in ground level which can be clearly distinguished from its surroundings, e.g. gravel or sand pits, road and railway cuttings or embankments. The tags should show the full extent of the slope, but may be omitted if two banks are close together. Impassable banks should be drawn with symbol 201 (impassable cliff).
Defined as line symbol 106.0. Can be drawn with any tool but bézier or straight line modes are preferable.
If the bézier tool is used, care must be taken as tag spacing is dependent on location of nodes and handles. See bézier topic for more information.
The default definition specifies a gap between tags of 0.75mm, compared with the ISOM specified distance of 0.5mm. Variation is allowed in the specification, see the Variations in Symbols topic for details.
Unless the change in slope is abrupt, and usually man-made, it is normally better to use contours than earth banks. If there is any danger then the impassable cliff symbol must be used.
(note that the 1997 rules are misprinted for these two sections which should read :-)
Steep Bank - ground significantly steeper than the surrounding terrain.
Quarry - gravel, sand or stone working in flat or inclined ground.
If the earthbank has a tight curve or sharp angle, you may have to cut out the central part of the curve and replace it with a plain brown line. As there is no default 0.18mm brown line, one will have to be defined (call it 106.1 earth bank line).
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