Water Framework Directive Marine Plants Task Team Tools Paper ...

Table 10: Final quality status and EQR for Milford Haven including the maximum,
minimum EQR values for the individual components, Standard deviation and standard
error using the reduced species list.
Reduced species list for Wales
Site Name EQR
Quality
Class Min Max St Dev St Error
West Angle 0.82 HIGH 0.67 0.91 0.101 0.045
Angle Bay 0.57 MODERATE 0.39 0.72 0.143 0.064
Sawdern Point 0.78 GOOD 0.67 0.82 0.062 0.028
Fort Hubberston 0.73 GOOD 0.56 0.84 0.114 0.051
Pembroke Ferry 0.73 GOOD 0.48 1.00 0.188 0.084
Average 0.72 GOOD 0.122 0.054
The final classification for the water body of Milford is based on the assumption that
for this individual metric the final EQR is an average of the EQR for each site. The
average EQR for the FSL is and with a standard error of 0.066 this results in a range
of 0.67 – 0.8. Although this is still within the Good class it is quite a broad range. This
range reflects the localised problems on isolated sites and places limited confidence in
the overall classification of the water body. However, this still enables localised
impacts to be targeted for future improvement, rather than tackling the whole water
body.
As the de­shoring factor has not yet been calculated for the reduced species list the
results at this stage are not completely accurate but show the final outcome without
taking account of the shore description.