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NEW YORK STATE MUSEUM 



Annual Reports of the State Engineer and Surveyor. The follow- 

 ing are the streams discussed in this connection: 



Genesee river. Hudson river. 



Oatka creek. Croton river. 



Hemlock lake. Mohawk river. 



Oswego river. East Canada creek. 



Seneca river. West Canada creek. 



Skaneateles outlet. Sauquoit creek. 



Chittenango creek. Oriskany creek. 



Black river. Schroon river. 

 Richelieu river— Outlet of Lake Champlain. 



Of the foregoing, Hemlock lake has been gaged by weir and 

 measurements of the amount flowing through the conduit leading 

 therefrom to the city of Rochester; Skaneateles outlet has been 

 gaged by weir and the amount flowing through conduit; Lake 

 Champlain outlet by rating curve, and Eaton and Madison brooks 

 by weir. The balance of the streams have been gaged by measure- 

 ments over dams, in accordance with the method described (1) 

 in the Report to the Board of Engineers on Deep Waterways: 

 and (2) in the paper On the Flow of Water Over Dams. 



Gagings over clams and through water wheels. Before proceed- 

 ing to describe these gagings we will consider somewhat the 

 methods used. Several of these gaging stations, as at Baldwins 

 ville, High dam, Little Falls, Middleville, Dolgeville. etc. have ex- 

 tensive power developments, with large quantities of water pass- 

 ing through turbine water wheels for either the whole or a por- 

 tion of each day. The dams at these places vary greatly in type 

 form. Hardly any two cross-sections are alike, although some 

 of them conform generally to certain types. Many of them have 

 considerable irregularity in the crests longitudinally. The 

 method of treatment in order to obtain approximately correct 

 results becomes, therefore, a matter of difficulty. In some 

 cases, as on West Canada creek, where the crest was very irregu- 

 lar, a small amount of work has been done in the way of leveling 

 it. Generally, however, the crests were left in nearly the same 

 condition as found. A profile was carefully taken and the crest 

 divided into a series of approximately level sections for compu- 

 tation. A gaging blank was furnished the gage readers, with 

 columns for entering depth on crest of dam, and number of 

 water wheels used, size of same, name of manufacturer and daily 



