Planet WGSW-24010 User Manual page 62

channel-width will be allocated an SCV of C5.
Box 8 Estimating per centage cover of individual species: squar e metr e method
1. Estimate the approximate average width of the channel.
2. Calculate the equivalent square metre areas that need to be covered in order for a
macrophyte to be awarded a particular SCV.
For 100m surveys using Scale C, refer to Table A2 in Appendix 5, highlight the most
appropriate width column and use this as a guide.
3. Estimate the number of square metres covered by each species within the survey
length and allocate the appropriate SCV.
Example
For a 100m survey length, channel width 5m, using Scale C, a macrophyte must cover the
following areas:
Scale point
(SCV)
C1
C2
C3
C4
C5
C6
C7
C8
C9
2
A macrophyte covering 6m would be recorded as C3.
NB These figures need to be recalculated for ANY DIFFERENCE in survey length,
channel width or abundance scale.
R&D Technical Report E38
Percentage Equivalent area
2
cover (m )
< 0.1 < 0.5
0.1 - 1 0.5 - 5
1 - 2.5 5 - 12.5
2.5 - 5 12.5 - 25
5 - 10 25 - 50
10 - 25 50 - 125
25 - 50 125 - 250
50 - 75 250 - 375
> 75 > 375
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