Time lag: a methodology for the estimation of vertical and horizontal

17 18 Abstract 19 The Water Framework Directive (WFD) in Europe aims, inter alia, to achieve at least 20 "good" water quality status by 2015 by mitigating the causes of pollution. However, 21 with the implementation of programmes of measures in 2012, many catchments may 22 not achieve good water quality status within this timeframe due to the time lag of 23

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