182 UNIVEESITY OF VIRGINIA PUBLICATIONS 



III. CLASSIFICATION. 



17. We propose the following formulfe for the computation of the 

 flow of water in pipes, conduits, artificial open channels and natural streams 

 of regTilar regimen. 



'^+ VV - . 



m = =^' 



l + .08y+ ^/8r 



1 + .087 + ySr 



5 

 where 



f ^ Vr 





lj9 

 -\ ^ 



Provisional values m' and <;' of «?- and c corresponding to 7 = 3 are 



suggested as follows : 



Otherwise, should it be preferred to express the final results directly 



m = ^^^ tan^ i6, 



1 + \/8r 



c = pcoiidyl'l + V8f, 



V = p coti^iy/ (1 + VW)Jr, 



whore 



tane=— ^ T' 



•^^ 1-.0195;A. 



^|: 



1 + V8»- 



25.06 >i /r 



1-.0195-^ 



