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Science Manual – Using Video Images for Fisheries Monitoring 39

• Channel to extend to the top of the fish pass wall.

• Removable flanges (100 mm long and 20 mm wide) to be bolted to either side of

camera channel at the bottom, to fix light panel or polypropylene board in position

(Figure A1.19A1.2).

Perspex sheet design to fix the light panel

Light panels to be fixed down by attaching counter-sunk (at bottom edge) flanges to

the Perspex sheets. Using coach bolts with the head on the river side will mean that

no turbulence will ensue from the bolts. Some form of fixing will be needed over the

Perspex sheet slots to ensure that they cannot ride up, and this could be something

that covers the top of the camera slot. This means that the light board shape remains

standard and simple, and it is a simple approach easily fabricated.

Camera mount

• It is recommended that the camera mount is constructed from Kee Systems

(www.keesystems.com

) Kee Klamp range of products.

• A vertical pole (size 6) to be bolted to a plate on the side wall of the camera

channel using a Type 70 “rail support” (size 6) clamp. This must be easy to

remove and attach as necessary whilst setting up cameras (Figure 20.3).

• The vertical pole to slot over a spike in the bottom of the camera channel, to hold

it in place (Figure 20.3).

• Camera contained within a Type 16 “clamp-on tee” (size 6) clamp (Figure

21A1.4). Depending on what make of camera is being used, it may be necessary

to pad camera out with rubber to ensure good fit within the clamp. Check camera

fits before installation.

• The clamp containing the camera to be attached to the vertical scaffold pole

using a Type 114 swivel tee (Figure 21). This will allow the camera to be aimed

up and down.

• Measurements provided in Figure 22 must be checked to ensure that, once in

place, the camera is in the centre of the channel and that the channel walls are

not within the field of view. If different clamps and poles other than those

recommended are used, then the measurements in Figure 225 will change.

Stop log grooves

Stop log grooves (100 mm x 100 mm) situated on either side of the

lighting/polypropylene board to allow isolation of the panels and camera chamber for

work and maintenance.

Water velocity in upstream exit channel

Maintain water velocity of 0.5 ms

-1

(coarse fish) to 1.0 ms

-1

(salmonids) to deter fish

holding in the upstream exit channel.

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Radiant DVMD1 Manual do Utilizador Página 47