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

Case Study – Outer Solway South
The Outer Solway South is in contrast to Milford Haven with numerous impacted
sites on the stretch of coast. This was used as a case study to ensure that the de­
shoring factor did not overestimate the quality status of the water body once applied
to the species richness. The results are shown in tables 13 and 14 and indicate two
definite bad quality sites with the remaining sites sitting on or near the
Good/Moderate boundary, this is further illustrated in figure 17 which also shows the
standard error at each site. The average EQR for the water body is 5.0 and Moderate
quality status. The EQR range based on the average standard error is 0.438 – 0.562.
Table 13: Metric component results for 10 sites within the Outer Solway South using
the full species list
Full Species List ­ Outer Solway South
Shore Species Corrected
Site Name
Description richness SR % greens % reds ESG ratio % opport
Parton 15 51 51 35.29 45.10 0.46 19.61
Tom Hurd Rock 14 39 43.68 30.77 38.46 0.44 17.95
Redness 14 44 49.28 36.36 38.64 0.47 25.00
Harrington 14 24 26.88 16.67 41.67 0.50 33.33
Cunning point (mine water site) 14 32 35.84 37.50 46.88 0.78 25.00
Cunning point (control) 14 57 63.84 33.33 38.60 0.54 24.56
Saltom Bay 14 35 39.2 31.43 37.14 0.35 22.86
Huntsman outfall 12 6 8.34 83.33 16.67 0.00 66.67
Whitehaven, Byerstead Fault 12 6 8.34 100.00 0.00 0.00 33.33
Tom Hurd Rock 12 28 38.92 46.43 42.86 0.33 39.29
Table 14: Final quality status and EQR for the Outer Solway South including the
individual site classifications, Standard deviation and standard error using the reduced
species list.
Full Species List ­ Outer Solway South
Corrected
Quality
Site Name
SR % greens % Reds ESG % Opport EQR Class StDev St Error
Parton 0.76 0.49 0.77 0.54 0.67 0.65 GOOD 0.126 0.056
Tom Hurd Rock 0.69 0.58 0.53 0.53 0.72 0.61 GOOD 0.088 0.040
Redness 0.74 0.47 0.53 0.56 0.55 0.57 MODERATE 0.101 0.045
Harrington 0.49 0.87 0.59 0.60 0.43 0.60 MODERATE 0.168 0.075
Cunning point (mine water site) 0.61 0.45 0.80 0.87 0.55 0.66 GOOD 0.175 0.078
Cunning point (control) 0.87 0.53 0.53 0.65 0.56 0.63 GOOD 0.143 0.064
Saltom Bay 0.64 0.57 0.50 0.40 0.59 0.54 MODERATE 0.094 0.042
Huntsman outfall 0.24 0.08 0.22 0.00 0.12 0.13 BAD 0.100 0.045
Whitehaven, Byerstead Fault 0.24 0.00 0.00 0.00 0.43 0.13 BAD 0.194 0.087
Tom Hurd Rock 0.64 0.34 0.74 0.39 0.31 0.48 MODERATE 0.195 0.087
Average 0.50 0.139 0.062