CURRENT METERS 



\t aiioth'-i Cation .t -loping staff gage wa iii*ialled. about 

 ts>. K. tret upstream from the bridge abutment. Fig. 36. A 

 \. meal utaff gage for high water p.-nod was in-t.ill.-d on the 

 upstream CIH he abutment*. Thus, both of theae 



gages are located so that if. t-i .m\ reason* there are back 

 A. .I, -i r.imht inn- at this bridge due to K or logs jamming on 

 ih. pi. i .. tin- gage heights will be correspondingly .ill. 

 Tlu* I.L.J.. i procedi n-iallm- these gages would have 



been tt> pl.tr. i\ -.1 staff gage i dc- -1 wntream M 



ili.- .ilMilnifiit .UK! ti pl.i. tli.- s|,,|,ing taff gage for low water 

 n. -MI- in .1 I in.- \Mth tin- first gage. Had this been 

 i.iins or an\ 'ili i li.nl :niiiins ..n th- uj- 



MI nlr ..i ill.- I.II.L'-- NN'-ul.l not afTcrt tlir gage readings, 

 \slnl.- .it tli-- lam th.- \. in. .tl staff gage would have been 



vlnl frnm tin- i-- ami |i-liri- whirh H >als in tin- stn-am 

 during high wat 



Fig. 37 illustrates another Jilliculty. In this case the gage 

 was placed on the bridge because it was nn\. -im-nt, and also 

 because the persons desiring the records were in a burn* for 

 data and did not care to spend time and money on proper 

 reconnoissance. The M.IH-.H was maintain. -.1 tour years. 

 During the \\intrr months it was always diflit-ult to obtain 

 measurements on account of ice conditions, and during the 

 -pi ing there were always log jams. The channel condition- 

 were very rough and a portion of the log jams always remained 

 during the summer months. In order to follow continually 

 changing conditions it was necessary to make a large number 

 ..i" mea-uremMits at a correspondingly high cost for mainten- 

 ance. Even with this done, the results obtained were .nl\ 

 approximate. As many as four temporary curves were drawn 

 and the exact period of ea eh rat in.- \ Main. The operating 



cost for four years at this station was more than the entire cost 

 ..i installation at the si.ition eventually located two miles further 

 downstream, at which accurate results were obtained at a low 

 operating cost. At the last station there are some difficulties 



11 ice conditions during Winter month*, hut it is possible 

 with t're.juent measurements to overcome this in a satisfart.TN 

 manner. In \ lew of the lack of time at the start to give the 

 n\er a thorough reconnoissanee. it \\ould have been cheaper 



