RURAL ENGINEERING. 



887 



The orifice opening: had the contraction suppressed on three sides, the l)ottom 

 edge of the gate giving complete contraction. 



Two sets of tests were conducted, one in which there was velocity of approach 

 and another in wliich the velocity of approach was eliminated. Three hook 

 gages were used. In the first series of tests gage G, was placed 1.75 ft. up- 

 stream from the plane of the orifice gate. The second gage, 0,, was placetl on 

 the downstream side of the gate, but outside of the flume. In the second series 

 of tests the velocity of approach was eliminated from the observation by plac- 

 ing a third gage, Gi, in a stilling ba?in attached to the side of the flume. Three 

 widths of opening, 1.5, 2, and 3 ft., were tested, and the height of opening varied 

 for each width from 0.1 to 0.5 ft. From the data obtained in the first series 

 the following standard equations were deduced for velocity of approach : 



Equations for velocity of approach, series 0~0z. 



1.6 ft. orifice 



Do 



Do 



Do 



Do 



2ft. orifice. . 



Do...... 



Do 



Do 



Do 



3 ft. orifice.. 



Do « 



Do 



Opening, 



0. 1 ft. 

 .2 ft. 

 .3 ft. 

 .4 ft. 

 .5 ft. 

 .1ft. 

 .2 ft. 

 .3 ft. 

 .4 ft. 

 .5 ft. 

 .1ft. 

 .2 ft. 

 .3 ft. 



Equations as 

 obtained. 



1.9992 



fl'= 1.5910 Q 



S.0I77 



n== .3557 Q 



1.0217 



J7= . 1332 Q 



S.I688 



i7= ,0569 Q 



2.1874 



S= .0310 Q 



S.OIOO 



£f=. .8512 Q 



2.DS8S 



27= .1941 Q 



2.1370 



E= ,0771 Q 



2.:900 



n= .0293 Q 



2.3)40 



E= .0157 Q 



1.9S7S 



£r= . 42,tO Q 



2.0347 



n=' .0925 Q 



2.0824 



n= .0350 Q 



Standard form. 



Q=0.6584V2ffA" 



2027T 



Q- .712A-j2gh' 



2-0217 



Q- .76SA-j2gh 



21888 



Q^ .916^V^ 



2 -l87« 



2010O 



Q- .GS2A-^f2gh 



t-mm 



Q- .7Z3A-j2gh 



2-137> 



Q= .■mA^/2Qh 



2.a)o» 



Q= .947^V^ 



2 -204* 



Q-= .996A-y/2gh 



I ■937» 



Q= .631^Vi^ 



2 0,-!47 



Q= .694^V2pA 



2 MM 



Q- .lh2A^[2gh 



From the data obtained in the second series of tests the following standard 

 equations of flow were deduced : 



Equations for no velocity of approach, series Ch-Gz. 



1.5 ft. orifice 



Do 



Do 



Do 



Do 



2 ft. orifice. . 



Do 



Do 



Do 



Do 



3 ft. orifice. . 



Do 



Do 



Opening. 



0. 1 ft. 

 .2ft. 

 .3 ft. 

 .4 ft. 

 .5 ft. 

 .1ft. 

 .211. 

 .3 ft. 

 .4 ft. 

 .5 ft. 

 .1ft. 

 .2 ft. 

 .3 ft. 



Equation as 

 obtained. 



B-1.5911Q2. 

 B= .3630Q2. 

 i7=- .1412Q!. 

 i7=. .0715Q2. 

 ^= .0434QS. 

 n= .8400Q2. 

 n= .2I0SQ5. 

 H== .a'^77Q». 

 //= . 03S9Q2 . 

 H=. .02a3Q2. 

 H^' . 4260Q2 . 

 H= .0948Q«. 

 H^. .0380Q». 



Standard form. 



•0. 659.4 V^'i 



■ .690AV^ 



• . 738.4 V2^ft 

 ' .7S0A-/$h 

 . .79S^V^ 



• .6.80.1 -v^ 

 . .079^V^ 

 . . 702^ ^f2gh 

 < . 805.4 V^ 

 . . 875^ ^2eh 



• .638^V^ 



■ .67G.^V^ 

 i .710A^2oh 



