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1 : Sites monitored on the River Leen for this study. The red lines delineate the two Water
Framework Directive (2000/60/EC) catchment areas used to classify the ecological status of the
river: the upper catchment from source to Day Brook, and the lower catchment from Day Brook to
the River Trent. Data from EA (2021b) and OS Open Rivers (2021).

A photograph of the River Leen, Nottinghamshire (open watercourse with vegetated banks)A graph showing soluble reactive phosphorus concentrations over timeA photo of Charlotte sampling water quality at the side of the River LeenA photo of recent works along the River Leen at the Nottingham Queen's Medical CentreA map of the sampling sites along the River Leen