142 BATHYMETRICAL SURVEY OF 



bottom, with drains running through it, and overflows when the depth of 

 water at the north end attains 10 feet, the south end being about 3 feet 

 deeper. The area draining into the reservoirs is about 4 square miles. 



South Settling Reservoir. The south pond is the larger of the two, 

 being nearly half a mile in length, by nearly one-third of a mile in 

 breadth, covering an area of about 73 acres, and containing about 43 

 million cubic feet of water. The deepest sounding in 26 feet was taken 

 near the middle but towards the west side, where there is a considerable 

 area, equal to about 21 per cent, of the total area, covered by more than 20 

 feet of water. The mean depth is estimated at 13^ feet. The temperature 

 of the water was nearly uniform throughout, the reading at the surface 

 being 47-l Fahr,, at 10 feet 47'0, and at 25 feet 46'8. 



North Settling Reservoir. The north pond is nearly half a mile in 

 length, by a quarter of a mile in maximum breadth, covering an area of 

 about 47 acres, and containing about 26 million cubic feet of water. The 

 deepest water occupies the north-eastern part of the pond, the maximum 

 depth of 22 feet being recorded close to the north-east shore, while an 

 isolated sounding in 20 feet was taken close to the western shore, near the 

 channel leading to the south pond. The mean depth is estimated at 12J 

 feet. The surface temperature was 46'8 Fahr. 



Crombie Den Reservoir (see Plate L.) lies about 2 miles to the north- 

 west of Monikie reservoirs, and is most irregular in outline. The wide 

 central portion is occupied by a large island, around which the water of the 

 reservoir forms a narrow channel, sending out a narrow shallow arm to the 

 west, and a wider deep arm to the south-east. The length from north-west 

 to south-east is nearly a mile, while the maximum breadth is only about 

 one-ninth of a mile, the superficial area being about 41 acres, and the 

 drainage area about 2J square miles. The maximum depth of 53 feet was 

 observed off the sluice at the south-east extremity of the reservoir, whence 

 the water shoals gradually towards the inflow at the opposite extremity. The 

 mean depth is estimated at 18 feet, and the volume of water at 31 million 

 cubic feet. The elevation could not be determined from bench-mark, but is 

 apparently about 500 feet above the sea. The reading on the sluice on 

 October 14, 1904, was 18*9. The water was practically uniform in 

 temperature throughout, the reading at the surface being 47'5 Fahr., at 5 

 feet 47-2, and at 50 feet 46-9. 



