60 BATHYMETRICAL SURVEY OF 



Loch Buidhe (see Plate XVI.). Loch Buidhe (or Buie) is very 

 shallow, and in places covered with weeds, though its surface is 

 practically free from islands. It is somewhat quadrangular, though 

 irregular, in outline, the maximum diameter (or length) from east 

 to west being about one-third of a mile, and the maximum breadth 

 from north to south about a quarter of a mile, the mean breadth being 

 about one-sixth of a mile. Its waters cover an area of about 35 acres, 

 or one-nineteenth of a square mile, and it drains an area 222 times 

 greater, or over 11 square miles. It is deepest towards the eastern 

 shore, where the maximum depth (3 feet) was observed in several 

 places, shoaling towards the western shore, off which the weeds are 

 most abundant; the volume of water contained in it is estimated at 

 2,265,000 cubic feet. It was surveyed on April 15, 1902, about 40 

 soundings being recorded. The surface of the water was determined 

 by the Ordnance Survey officers in 1897 as being 981 feet above sea- 

 level. The temperature of the surface water at 7 p.m. on April 15, 

 1902, was 48 Fahr. 



Lochan no, Stainge (see Plate XVI.). Lochan na Stainge (or 

 na-Sting) is extremely irregular in outline, and includes three com- 

 paratively large islands, as well as a number of small ones. Its 

 length from north to south is over half a mile, the maximum breadth 

 being two-fifths of a mile, and the mean breadth about one-seventh 

 of a mile. Its waters cover an area of over 51 acres, or rather more than 

 one-twelfth of a square mile, and it drains directly about two-thirds 

 of a square mile, but, since it receives the outflow from Loch Buidhe, 

 its total drainage area is nearly 12 square miles, or 147 times the area 

 of the loch. The loch is divided into two portions by a barrier at the 

 central constriction, on which there is only 1 foot of water, the 

 maximum depth observed in the northern portion (between the large 

 island and the northern shore) being 8 feet, while the maximum depth 

 of the loch (14 feet) was found in the southern portion immediately to 

 the south of the barrier referred to. The volume of water contained in 

 the loch is estimated at 11,407,000 cubic feet, and the mean depth at 

 5 feet. The loch is on the whole shallow, nearly 99 per cent, of its 

 floor being covered by less than 10 feet of water. It was surveyed on 

 April 19, 1902, 55 soundings being recorded. The level of the loch was 

 not determined by levelling, but on the new edition of the Ordnance 

 Survey map (1897) there is a spot-level of 972 feet on the southern 

 shore near the inflow, and another of 968 feet on the northern shore at 

 the outflow, so that the surface of the water is probably about 970 feet 

 above the sea. The drift-marks around the loch showed that it some- 

 times rises 5 feet higher than on the date surveyed, and during floods 

 the whole valley looks like one loch, with knolls projecting above the 

 water. The temperature of the surface water at i0.30 a.m. on April 



