Fig. 9From: Quality control in public participation assessments of water quality: the OPAL Water SurveyComparison of water clarity data measurement techniques. Relationship between OPALometer readings and empirically measured a Secchi disc and b total suspended solids (TSS) from the OPAL water centre monitoring dataset [51] and conversion of OPAL scores into c Secchi disc depth and d total suspended solids concentration measurementsBack to article page