CURRENT METERS 



57 



lint. -.1. t.. U ', th, f \Ml\\ ihr lime. The 1 at whieh MUM- 



no-lit i- IM-IM- ni.i. |e at tin- tun.- .i i.-.tdm- the gage should also 



in the notes. At a recording gage station this distance 



tin- uiiii.il point .it \%lin h measurement is being made at 



e\en hour* inr iiaetion* thereof) if the stage is changing, is 



not.-d an tin- ni.-a-ni.-meni progresses, and the corresponding 



gage heights are later taken from the automatic register. At 



non-recording stations, the gage height .- n..te| Mmilarly 1\ 



reading < ith i the gage itseli. r flse distances above or below 



lltl\ j'l.l. ,-,! , r 



i.-l.itiMii t> the gage height. 



To give pn: lit to the gage height readings, take tin- 



average ot ih. (MM .,n,l ... , .,ml gage heights and multiply that 

 .IN.-I.IIX l\ tin- li-.-h.ir^r th.it has been computed IT th.tt part 

 "t the cross-sect i< in U-t \\r.-n the vertical in which obsen.i 

 was made at the tune ,.| i.-.,lm- th. first gage height, and the 

 \< ideal corresponding to the time reading of the second gage 



ht. Proceed similarly for the second and third gage height-. 

 thn.i .ind fourth, fourth .m<l liftli. and so on, multipUnu .-.i. h 

 average gage height l>\ the corresponding parti.il discharge. 

 >um up all the (iLninets of average gage height and partial 

 discharge and divide this Mim l>\ the total discharge as com- 



d by adding up column 12. The quotient i - the required 

 weighted mean gage height. 



_x- Wlnt. 



lit. 



