DARTMOUTH LAKES POWER. — DOANE. 31 



livan's Pond, tlirougli which water is drawn from First Lake 

 for the StaiT Company's plant, is comparatively very small, and 

 has practically no watershed. When First Lake is full, there 

 is a head of about twelve feet above Sullivan's Pond. Assum- 

 ing that First Lake can be maintained at ovei'flow level every 

 day of the year, and that the quantity hereinbefore estimated is 

 available, a wheel at the canal lock would develop at 75 per cent, 

 efficiency, 28 horse-power for 24 hours, or 77.5 horse-power for 

 9 hours. If Sullivan's Pond could be raised 12 feet, this addi- 

 tional power would be available at the Starr works without 

 electric transmission. 



The quantity of power that could be taken from the estim- 

 ated available water by carrying it in a pipe from First Lake to 

 a wheel at high-water mark would not be greater than that 

 developed by a wheel at the Canal lock- at the foot of First Lake, 

 and another at high-water mark, operated by water drawn from 

 Sullivan's Pond. The total would be about 390 horse power for 

 9 hours, or 1-15 hore-power for 24 hours. 



The fall in the stream from Lake Charles to Second Lake 

 affords another opportunity to increase the total capacity of this 

 power. This portion of the old canal is known as Port Wallis 

 Locks. The upper lock gate is closed, and holds the water up to 

 the level of Lake Charles. There is a fall in the lock of about 

 19 feet, and at the lower lock about 10 feet. Estimating the 

 available portion of the rainfall over the watershed drainins; to 

 this point at tAvo feet, a wheel at Port Wallis Locks would 

 develop 25 horse-power for 24 hours or 66 horse-power for 9 

 hours. 



The quantity of water available, de})ending not only on the 

 rainfall but on the possibility of storage, it is of the greatest 

 importance to know what can be done to hold the water draining 

 through the old canal. The writer is not familiar with Lake 

 Loon, and has had no opportunity to ascertain the storage poss- 

 ibilities of this lake. It is stated, however, that a rise of three 

 feet would cause the water to flow in another direction. 



