Study location; the white dash-point line depicts the extent of the study area and the white dashed lines show cross sections referred to throughout the main text; the arrow pointing to the location of the fish pass entrance is orientated perpendicular to the front wall of the fish pass;  and  stand for the streamwise and cross-stream directions; the images on the bottom right show the study site on the day of the data collection looking in the upstream direction (20 August 2014).