Fig. 16
From: Quality control in public participation assessments of water quality: the OPAL Water Survey
The effect of changing water quality tiers on the 2010 OPAL Water Survey final dataset. OPAL Water Survey 2010 pond health score dataset classified into water quality bands using a the original Big Pond Dip scheme [42]; b the OPAL Water Survey scheme with the additional “excellent” classification (marked as asterisk; see text); c the Big Pond Dip ‘equal bands’ scheme “for detailed interpretation” [42] and d the Big Pond Dip 2014 classification [54]