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



hurriedly made, and where the gages were put in without an\ 

 consideration to the effect of their location on the result inu 

 records. The example given is that of two gaging stations on 

 an eastern river, one on the east branch and the other on the 

 the west branch. From the gages to the junction of the two 

 branches is approximately one and a half miles. The differ- 

 ence of elevation of the water surface at the two points is less 

 than two feet at all normal stages. During high water periods 

 there is always back water at one or both of the gages. While 

 it is possible to determine the amount of back water, it would 

 be expensive, and would have to be repeated at each successive 

 flood, because the different conditions of flow produce different 

 conditions of back water. On the west branch of the stream a 

 chain gage was located near the center of a suspension bridge. 



covtd oo *w 



\ .',- showing poor lomtioii of <;;min;: St.iti.m. because of Junction of 



two hrniiriirx -:m<ini: backwater. The location of gages 



at each station is also poor. 



