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Minor water channel 307

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This page contains content from ISOM2000   This page contains content from Ashby Mapping    Mountain Bike-O symbol  revision 05/00

Specifications

307 Minor water channel

A natural or man-made minor water channel which may contain water only intermittently.

Colour: blue.

Line width 0.14mm, line length 1.25mm, gap 0.25mm

ISOM 1990 Definition

As ISOM 2000 but line width was 0.125mm

OCAD Methods

Defined as line symbol 307.0. Can be drawn with any tool but straight line mode or bézier mode are preferable.

If the bézier tool is used, care must be taken as gap spacing is dependent on location of nodes and handles. See bézier topic for more information.

OCAD default definition

The default definition has a gap between dashes of 0.3mm, compared with the ISOM specified 0.25mm. Variation is allowed in the specification, see the Variations in Symbols topic for details.

Drawing Considerations

See minimum dimensions but specifically - shortest dashed line: at least two dashes.

If there are many ditches, the principle channels are best drawn with the solid blue symbol.

Pictorial Descriptions

- BOF Rules, Appendix One

Ditch: An artificial watercourse with slow moving or standing water.

See the Crossable watercourse topic for tips.

Optimising junctions of dashed lines

First try adding a node at, or close to, the junction, next try the cut and reverse line tools. If the spacing is still incorrect, cut back and add an extra line at the junction, either with or without gaps.

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International Specification for Orienteering Maps produced by the International Orienteering Federation
OCAD produced by Hans Steinegger Software. © 1988-1999 Hans Steinegger. ® OCAD is a registered trademark of Hans Steinegger
This document has been written and coded by Peter Hornsby of Ashby Mapping
Apologies for any mistakes and errors; please inform details of any problems, thanks.
Produced for the Ashby Mapping internet site on 20 November 1997 and 1 December 1999  ©1997-2000 Ashby Mapping
Revised 28 December 1999, 23 March 2000