Table 2.6: Recommended physical and hydraulic standards for vertical-slot and rock-ramp fishways. Vertical-slot fishway (generally suitable for up to 6 m head differential) Fish Target Min pool Min Target Max Slope Pool to pool Min head Max Entrance Head loss Min Weir Location of volume (L) slot slot head loss loss @ water and exit @ trash style for entrance (m) width (Wm3) velocity (mm) entrance velocity flow vectors racks (mm) DS and exit, (mm) (mm) (Cd (ms-1) (mm) @ (degrees pool migrants of 0.7) fishway from stream depth of exit centreline) weir for DS (ms-1) 20– > 0.5 825 (i.e. 100 <25 <1.20 >1:30 <75 45 0.05 <900 from <20 40% of Overshot U/S or D/S 100 1.5 x 1.1 m) stream max head of centreline, differential migration no limit recirculation 100– > 0.75 2800 (i.e. 150 <30 <1.40 >1:30 <100 60 0.15 <900 from <20 40% of Overshot U/S or D/S 200 2.5 x 1.5 m) stream max head of centreline, differential migration no recirculation 200– > 1.0 5000 (i.e. 250 <50 <1.6 >1:25 <120 72 0.3 <900 from <20 40% of Overshot U/S or D/S 700 2.5 x 2 m) stream max head of centreline, differential migration no limit recirculation 700+ > 1.5 (i.e. 350 <50 <1.8 >1:20 <165 100 0.3 <900 from <20 50% of Overshot U/S or 3.5 m) stream max D/S of 2 centreline, differential migration head no limit recirculation Min = minimum, max = maximum, US = upstream, DS = downstream. Guidelines for the design, approval and construction of fishways 31
Table 2.6: Recommended physical and hydraulic standards for vertical-slot and rock-ramp fishways. Vertical-slot fishway (generally suitable for up to 6 m head differential) Fish (mm) Target (m) Min pool volume (L) Min slot width (mm) Target (Wm3) (Cd of 0.7) Max slot velocity (ms-1) Slope Pool to pool head loss (mm) Min head loss @ entrance (mm) Max water velocity @ fishway exit (ms-1) Entrance and exit flow vectors (degrees from stream centreline) Head loss @ trash racks (mm) Min pool depth of weir for DS Weir style for DS migrants Location of entrance and exit, 20– > 0.5 825 (i.e. 100 <25 <1.20 >1:30 <75 45 0.05 <900 from <20 40% of Overshot U/S or D/S 100 1.5 x 1.1 m) stream max head of centreline, differential migration no limit recirculation 100– > 0.75 2800 (i.e. 150 <30 <1.40 >1:30 <100 60 0.15 <900 from <20 40% of Overshot U/S or D/S 200 2.5 x 1.5 m) stream max head of centreline, differential migration no recirculation 200– > 1.0 5000 (i.e. 250 <50 <1.6 >1:25 <120 72 0.3 <900 from <20 40% of Overshot U/S or D/S 700 2.5 x 2 m) stream max head of centreline, differential migration no limit recirculation 700+ > 1.5 (i.e. 3.5 2 m) 350 <50 <1.8 >1:20 <165 100 0.3 <900 from stream <20 50% of max head Overshot U/S or D/S of centreline, differential migration no limit recirculation Min = minimum, max = maximum, US = upstream, DS = downstream. Guidelines for the design, approval and construction of fishways 31
ARI-Technical-Report-274-Guidelines-for-the-design-approval-and-construction-of-fishways.docx