8 BATHYMETRICAL SURVEY OF 



therein being 106 feet. Towards the eastern end of the large 50-feet 

 depression is a small shallow patch in the centre of the loch opposite 

 Portnellan, in which a depth of 36 feet was found. 



At the extreme eastern end are situated the sluices and weir, over 

 which the compensation water passes into the river Teith; at some 

 distance from the sluices the depth of water flowing over a weir is 

 recorded twice a day. 



The area between the shore and the 50-feet contour is estimated at 

 about 635 acres, or 62 per cent, of the entire superficial area of the loch, 

 while the area between the 50- and 100-feet lines is estimated at about 

 324 acres, or 31 per cent., and the area with depths over 100 feet is 

 estimated at about 71 acres, or 7 per cent, of the area of the loch. 



Loch Drunkie (see Plate V.). This picturesque and irregular High- 

 land loch is shut in on all sides by high hills, is difficult of access, and 

 rarely visited. The surface of the loch, according to the Ordnance 

 Survey maps, is 416 feet above the level of the sea, but it was raised 25 

 feet in connection with the water-supply to the city of Glasgow, with 

 the view of furnishing compensation water to the river Teith. The 

 soundings shown on the map give the depth in the loch in April, 1899. 



Loch Drunkie is remarkable in many respects. It is the smallest 

 of the five lochs in the Loch Katrine district, but deeper than the larger 

 Loch Arklet situated at a similar high elevation, and quite as deep as 

 the neighbouring Loch Achray situated at a lower elevation. In form 

 it is peculiar, consisting of a quadrangular portion throwing out three 

 arms of various sizes in different directions. The largest arm runs in a 

 north-easterly direction, the extremity approaching within a quarter of 

 a mile of the southern shores of Loch Vennachar; this arm contains 

 the greatest depths observed in the loch, and near its extremity the 

 Ordnance Survey map indicates a small island which was not seen. 

 The second arm in point of size runs directly west, and contains a 

 maximum depth of 80 feet. The smallest arm runs in a south-westerly 

 direction, deepening gradually though irregularly from 6 feet at the 

 extremity to 15 feet near the junction with the quadrangular body of 

 the loch. 



The maximum length of the loch (between the extremities of the 

 north-eastern and south-western arms) is over one mile ; from the 

 extremity of the western arm to the opposite (eastern) shore of the loch 

 is a little less. The maximum width of the quadrangular body of the 

 loch is over a quarter of a mile. The mean breadth is 0*21 mile, being 

 21 per cent, of the length. The waters of the loch cover an area of 

 about 138 acres (0'22 square mile), and drain an area ten times greater, 

 or over 1400 acres (2 '2 square miles). The number of soundings taken 

 in Loch Drunkie was 155, the average depth of these being 38J feet, 

 the greatest depth observed (exactly the same as in the case of Loch 



