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38 Science Manual – Using Video Images for Fisheries Monitoring

Appendix 1: Provision for video

monitoring of fish passes: outline

specification for head of passes

Simple modifications to the design of the head of a fish pass will permit monitoring of

fish passage by video. This can be achieved by illuminating the counting area,

increasing the distance of cameras from the fish and allowing for isolation of the area

in order for adjustments to the system to be carried out.

Incorporating the following points should facilitate video monitoring in most

circumstances, except for passes with very short exit channels. A general

specification that applies to most passes with an exit channel is described first.

Overviews of the head design for each type of fish pass are provided in subsequent

sections and details are provided where the design differs from the general

specification.

A1.1 General specification

Side recess

• Galvanised steel runner mounted in side of pass to accommodate lighting panel

or polypropylene board, so that the board/panel is flush with the wall of the pass

when in place (Figure A1.1).

• The runner to have an inside depth of 35 to 40 mm, width of 620 mm and to

extend to the top of the fish pass wall so that the board/panel can be slotted in

and lowered into position (Figure A1.1).

• The two front retaining flanges to be 30 mm long.

• If a light panel is required, it should be 30 mm x 600 mm x height equivalent to

Q10.

Bed recess

• Recess 30 mm deep in base of pass, on downslope if present to accommodate

lighting panels or polypropylene boards.

• Recess to extend 620 mm in an upstream-downstream direction.

• The width of the recess will be dependent on the width of the pass and should

span the entire pass width.

• If a light panel is required, the dimensions of the panel should be 30 mm x 600

mm x (width of pass – 20 mm).

Camera channel

• Camera channel to be installed central to the bed recess and/or centrally

opposite the side recess.

• Channel to be made from galvanised steel and mounted within the concrete

structure (Figure A1.19A1.2).

• Dimensions: 300 mm x 300 mm.

• Slots (Figure A1.19A1.2) either side of front of channel to allow an 8 mm thick

perspex sheet (with optical refraction index similar to glass) to be slotted in front

of the camera. Designed so that the Perspex sheet is keeping the light panel in

place (see below) and when in place, the front of the channel is more or less

smooth and continuous with the fish pass wall.

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Radiant DVMD1 Manual de usuario Pagina 46

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