of the Fishery Board for Scotland. 



7 



cumbered with ice, or while necessary repairs are being executed on 

 any emergency ■ provided that nothing be omitted, or done un- 

 necessarily to defeat the objects of this bye-law. Furthermore, in 

 all cases when the intake sluice is more than 300 yards from the 

 water wheel, it shall not be imperative to shut the intake sluice, 

 or to keep the bye-wash sluice shut, during ordinary meal hours, or 

 during any stoppage of the wheel not exceeding an hour at a 

 time. 



3. At the intake of every lade there shall be placed and con- 

 stantly kept a heck or grating for each opening, or one embracing 

 the whole openings, the bars to be not more than three inches 

 apart, if horizontal and not more than two inches if vertical. 



4. A similar heck or grating shall be placed and constantly kept 

 across the lade or troughs immediately above the entrance to each 

 mill wheel. 



5. A similar heck or grating shall be placed and constantly kept 

 across the lower end of each tail lade at its entrance into the main 

 river. 



Note. — To prevent any obstruction to the flow of the water by 

 the hecks or gratings in the lades, it is recommended that 

 the lade should be increased in width where the hecks are 

 placed, and that the heck, instead of being in a straight 

 line across, should be curved or pointed up or down stream, 

 and thereby increased in length, so that the aggregate of 

 the openings between the bars shall exceed the sectional area 

 (or waterway) of the lade, and thus compensate for the space 

 occupied by the bars. 



6. There shall be a bye-wash sluice placed as near as practicable 

 above each water wheel in the embankment of the lade of not less 

 than three feet in width, with its sill as low as the bottom of the 

 lade, and the said sluice shall be raised to a height sufficient to 

 allow the smolts to descend for at least five but not exceeding eight 

 hours each week from the 15th March to the 1st July, not more 

 than six days intervening between each time of opening. 



There shall be a salmon pass or ladder on the down stream 

 face of very dam, weir, or cauld, capable of affording a free pas- 

 sage for the ascending fish at all times when there is water enough 

 in the river to supply the ladder. The width shall not be less than 

 four feet in the clear in rivers of less than 100 feet in breadth at the 

 site of the dam, nor less than five feet in breadth in rivers of less 

 than 200 feet and more than 100 feet in breadth as aforesaid, nor 

 less than six feet in breadth in rivers of more than 200 feet in 

 breadth as aforesaid ; the upper sill shall be not less than six inches 

 below the lowest part of the crest of the dam for the whole width of 

 the ladder ; the inclination shall in no case be steeper than five 

 horizontal to one perpendicular, but, wherever practicable, shall be 

 seven or eight horizontal to one perpendicular, and in all cases shall be 

 provided with breaks or stops placed at suitable intervals, so as to 

 lessen the velocity of the current sufficiently to allow the fish to 

 ascend without difficulty. 



The foot of the ladder shall be placed where there is most running 

 water, and with the best lead for the fish to approach it ; and if the 

 ladder should project beyond the toe of the dam, there shall be an 

 apron of stone formed to the dam, extending as far down the river 

 as the entrance to the pass or ladder, and extending throughout the 



