342 BATHYMETRICAL SURVF.Y OF 



Loch Mullardoch (see Plate LXXX.). Loch Mullardoch (or 

 Mulardich, or Moyley) lies less than 2 miles to the east of Loch 

 Lungard, and is practically continuous with Loch Sealbhag, there 

 being a small expansion of the river between them called Loch Ath 

 a' Bhan, which was not sounded. Loch Mullardoch trends generally 

 in an east and westerly direction, and is somewhat irregular in outline, 

 with a slight bend in the central portion. It exceeds 4 miles in length, 

 and is pretty uniform in width, the maximum breadth being less than 

 half a mile, and the mean breadth over a quarter of a mile. Its waters 

 cover an area of about 756 acres, or considerably more than a square 

 mile, and the area draining directly into it is about 27 J square miles ; 

 but since it receives the outflow from Loch Lungard its total drainage 

 area exceeds 50 square miles. The maximum depth of 197 feet was 

 observed in the eastern portion of the loch, about a mile and a half 

 from the east end. The volume of water is estimated at 2553 millions 

 of cubic feet, and the mean depth at 77J feet. The loch was surveyed 

 on October 7, 1903, but the elevation above the sea was not determined ; 

 when levelled by the Ordnance Survey officers on November 29, 1866, 

 the elevation of the lake-surface was found to be 704*9 feet above sea- 

 level. On the date of the survey the water was about a foot above the 

 normal level, and two days previously it had been 3 feet higher. 



Loch Mullardoch is divided into two deep basins by a shoaling of 

 the water in its central portion, where there is a constriction and bend 

 in the outline, the maximum depth in the western basin being 150 feet, 

 and in the eastern basin 197 feet, the depth on the shoaling being 80 

 feet. A section across the deepest part of the western basin is shown in 

 cross-section C-D, and one across the deepest part of the eastern basin 

 in cross-section E-F, on the map, and a section along the centre of the 

 loch from end to end is shown in the longitudinal section A-B at the 

 foot of the map. This last-mentioned section brings out the central 

 shoaling referred to, which is apparently traceable to the influence of 

 the streams entering on both sides of the loch at this place, and 

 principally of the Allt Taige, at the mouth of which, on the northern 

 shore, is a considerable delta. The 50-feet contour is continuous, and 

 encloses a basin nearly 4 miles in length. The western 100-feet basin 

 exceeds half a mile in length, separated by an interval of over half a 

 mile from the eastern 100-feet basin, which is one and a half miles in 

 length, and includes a 1 50-feet basin over a mile in length. All the 

 cross-lines of soundings show a regular bottom, the water deepening 

 gradually from the shore towards the centre, with a steep offshore slope 

 in some places, as, for instance, along the southern shore off Creag 

 Dubh, where a sounding in 24 feet was taken about 20 feet from shore, 

 and off Creag a' Bhaca, at the deepest part of the loch, where a sounding 

 in 94 feet was taken about 100 feet from shore. The following table 

 gives the approximate areas between the consecutive contour-lines at 



