236 BATHY METRICAL SURVEY OF 



Loch of Flucjarih (see Plate XCIX.) is a small, narrow oblong loch, 

 running due north and south, and close to the Sand Voe, on the north 

 coast of the Mainland. It lies amid low country, cultivated to north 

 and south, at only a few feet above sea-level (determined by the Ord- 

 nance Survey to be 6'4 feet on October 23, 1876). The axis is slightly 

 curved. It is half a mile long, by fully one-eighth of a mile in maximum 

 breadth. The basin is flat-bottomed, with a maximum depth of 8 feet, and 

 a mean depth of 5 feet. The superficial area is 40 acres, and the volume 

 of water 8 millions of cubic feet. A considerable stream from the Bergs 

 of Skelberry (648 feet) enters the south end of the loch, and the outflow, 

 through Vats meadow, is barely 100 yards long. It drains fully a square 

 mile of country. 



The surface temperature was 58-0 Fahr. on August 8, 1903. 



Muckle Lunga Water (see Plate XCVIII.) is a fairly large loch, of 

 very irregular form, about a mile to the north of Roer Water, and draining 

 through a chain of lochs which were not surveyed, into South Wick, 

 on the west coast of the Mainland. It is longer than Roer Water, 

 measuring three-quarters of a mile from south to north, but is narrower 

 (a quarter of a mile in greatest breadth), and of smaller superficial area 

 (about 58 acres) and volume (17 millions of cubic feet). It is very 

 shallow, having a mean depth of about 7 feet, and only a very small area 

 over 10 feet deep, and the maximum of 27 feet, to the east of the centre, in 

 the broadest part of the loch. 



Muckle Lunga is the uppermost of the chain of lochs, and drains a very 

 small area of only a third of a square mile. The burn flowing out north- 

 ward to Moosa Water, then westward, changes its name, as is so common 

 in Shetland, being the Moosawater burn after passing the loch of that 

 name, and finally the Brettoo burn when tumbling over the cliffs into the 

 South Wick. The height of the surface above sea-level could not be 

 measured, but is estimated at somewhere between 450 and 500 feet, being 

 the most elevated of the lochs surveyed in Shetland. 



The surface temperature on August 7, 1903, was 55*8 Fahr. 



Birka Water (see Plate XCVIII.) is a small triangular loch, a short 

 distance to the north of Ronas hill. It is fully a third of a mile long 

 from south to north, and a quarter of a mile broad at the extreme 

 south end. It is a simple basin, the 10-feet contour being close to the 

 shore except at the angles, the slope of the bottom being gradual to the 

 20-feet contour, then steeper to the centre, where the maximum depth 

 of 45 feet occurs. The mean depth is 12 feet, the superficial area about 

 30 acres, and the volume of water 15 millions of cubic feet. It drains an 

 area of 3 square miles, receiving most of the water collected on the north 

 slope of Ronas hill, and the overflow of a large number of lochs. The 

 burn flows out in the middle of the west side, and, after a course of about 



