2 



Appendices to Twenty-sixth Annual Report 



The new pass was designed by Mr. P. D. Malloch, Perth, and is 

 arranged so as to admit of two water inlets of different level from 

 the loch, with channels joining at an angle of the pass. "When I 

 saw the plans in 1905 the only drawback which presented itself to 

 my mind was the manner in which the sluices below the gauge- 

 house worked. These from the date of their construction had 

 been made to open by being lowered, rather than, as usual, by 

 being raised. A proposal to have the two sluices altered was met 

 by a suggestion to have one or other either entirely open or 

 entirely closed. This at first seemed a simple way out of the 

 difficulty, but ultimately it was found that to carry out the 

 suggestion would have meant at times an altogether undue rush of 

 water. The proposal to reverse the working of the sluices was 

 not, unfortunately, reintroduced or decided upon. Mr. Malloch, 

 however, in constructing this section of the pass, had the first 25 

 feet made level, and three stones, each 20 inches high, introduced 

 in order to, as far as possible, raise the height of the water behind 

 the sluices, and so provide a "take-off" for ascending fish. The 

 construction of the pass was carried out by Mr. Sutherland, the 

 Water Engineer to the Glasgow Corporation, and has been 

 carried out in every particular in a highly satisfactory manner. 



The past season having been exceptionally wet and the streams 

 constantly high, no very favourable opportunity was presented for 

 watching the pass and observing the ascent of fish through it, but 

 an unusual number of fish were taken in Loch Vennacher and an 

 unusual number were noticed spawning in the Finglas Water. 



The two photographs which I am able to give have been 

 supplied by Mr. Malloch. The first is a view of the pass and 

 " the cut" seen from the gauge-house of the loch outlet. Beyond 

 the bank on the left is seen part of the natural channel from the 

 loch, which is joined by the cut in the distance of the view. The 

 pass, with its two upper channels — only one of which is in use — 

 is seen to return upon itself and continue downwards by the 

 single curving channel. In the second photograph the view is 

 taken from the turn in the pass looking towards the gauge-house, 

 and is therefore the reverse view of the former. The high wall on 

 the right separates the two upper channels, and prevents the 

 higher one, which is in use, from being seen into. The dry lower 

 channel is well shown with its arrangement of stones to break the 

 force of descending water when the sluice is open. The outlet or 

 mouth of the pass is seen on the left close to the gauge-house. 



Behind the sluices 25 feet of the pass are laid level, and at the 

 turn or angle 14 feet are level. 



The remainder of the pass has a uniform gradient of 1 in 20. 



The rows of upright stones are 10 feet apart. 



There seems to be little doubt that the streams from Lochs 

 Katrine, Achray, and Vennacher, in other words the line of the 



Length of Pass, - 

 Breadth of Pass, 

 Height (including sluice), 



194 feet. 



7 ,, 

 12 „ 



