70 W. & L. E. GURLEY, TROY, NEW YORK 



ultimately to have used a cable to overcome the poor channel 

 condition-; at the bridge. 



In selecting a gaging station the judgment should not be 

 unduly influenced by existing bridges or other convenient 

 structure- lor supporting the gage, or from which measurenn Mi- 

 may be made. Better results will be obtained at smaller cost 

 if these structures are ignored and the attention confined to ih< 

 hydraulic features. The same mature consideration should be 

 ;i\en the cost of operating the station as to the first cost of it- 

 installation. 



OBSERVERS 



The presence of a reliable observer is often a controlling 

 factor in establishing a station. In many places this fact 

 cannot be ignored, but where there is a choice the station should 

 be placed at the most favorable location, and should not ! 

 subordinated to the convenience of the observer. The intro- 

 duction of automatic registers which meet successfully all of 

 the requirements at isolated places have solved many of the 

 perplexing problems arising from the absence of observers at 

 such stations. 



ESTABLISHMENT OF STATIONS 



After the reconnoissance has fixed the location and type of 

 the station, its equipment is then installed. The most approved 

 practice in the equipment of current meter gaging stations will 

 be found in (U. S. Geological Survey) Water Supply Paper 

 No. 371*, which may be obtained from the Director, U. S. 

 Geological Survey, Washington, D. C., while the most approved 

 methods of observing and preparing the data will be found in 

 " River Discharge." ** 



Briefly, such stations for determining the total flow of a 

 stream and its diurnal fluctuations need in general the follow- 

 ing equipment: 



1. A gage or gages to indicate or to record the fluctuations 

 of stage. 



K<|ui|iiiirnt for Cunv:it M-|IT ;;iiri:iu' St:itins. by Geo. J. Lyui. M. 

 Am. S- C I 



For >::! l.y W. & L. K. CInrl.-y. f00 Bet, postpaid. 



