WATER STAGE REGISTERS 81 



ii ami the i|ii.tii(it\ .! \s.it r required U in 

 .! ihr -n||ly. 



7. \\ 1111:1 -MM i STREAMS OP SUDDEN PLUCTi \ii"\ ARE 

 \ii\Mitih in \\im- nut u ii m< M K.N ..> \\MI.K in im. 

 COURTS. 



Tin- IIIIMII o| llirn- >r four ii . i< liii^- |M r l.i\ .l tin- h .i.l on 



uiy give an erroneous result, especially when the stream 



U suli'*t I- flu- hi.iin.n. T> |f..|i.-il\ obtain the mean head 

 on the \s M. .' l ),, MI i |.. HIM! an automatic register should 



be installed a sul1i< i-m distance above the crest of the i 

 to avoid the effects due to the curvature of the approaching 

 water. 



8. WHERE Tin \\ MI.ABLE CAGE READERS DO NOT H\M 



-i i i i n \ i IN I I i i L. i \CE TO READ A CAGE OR CAN NOT BE 

 TRUST I U. 



9. Will i: l l ii l STATION IS SITUATED AT AN ISOLATED 

 POINT AND A CAi.i 1:1 \!>ER IS NOT AVA1LABI l 



'lli- necessity for establishing a station at an isolated point, 

 where a gage reader is not available, has caused the installation 

 of many automatic registers. Many stations are 50 to 100 

 mil.- limn a railroad in regions whose inhabitants have no 

 fixed abode. This condition affects the coll.-. n..,, O f data for 

 irrigation projects !<> tlian for water powers. Irrigation lands 

 are in grn -ral not so rnn<>t< from habitations as water power 

 sites. At several stations in the West valuable stream flow data 

 conlil not ha\r been collected had tin- continuous automatic 

 water stage ivp>trr not hern invented. 



ESSENTIAL FEATURES OF AUTOMATIC 

 WATER STAGE REGISTERS 



\ n t. n MM. recording water stage registers consist of: 

 Mi \ float that rises and falls with the surface of the 



wat< 



A merhaniMii ihat transfers the vertical motion of the 



float to tin- ivoinl. nih.T in natural or reduced scale. 



(3) A -t' |M|-r on \\hii h a record of the rise and 

 fall of the float is made. 



(4) A clock. 



A covrr t.r tin- instrument. 



