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Cross track drainage is essential for durable tracks.
6 is adequate - see
classes of    track Descriptions of track type (see and )
clearing Appropriate reduction of vegetation required to develop a track alignment.
clinometer A hand held instrument for establishing grade or slope
Drainage which prevents water lying on, or draining along the track
contour A line on a map joining points of equal elevation
creekline A natural drainage channel with temporary or permanent water
debris line The line where track and backslope abut, where deflation or accretion encourages traffic to move downslope and results in track widening (see picture )
decal A self-adhesive label for applying information to trackmarkers
  ... understands and uses ...