CURRENT M I MI 



4. The duration of the velocity observation in seconds as 

 'mutt! by means of the -i..p-wat h. 



5. TV iiuMil..-!- of revolution!! of the cups in the time noted 



in i-oliimii I. I ..i -OHM -mener ill computing, the numb* 

 i.-M.luhoiw should be one of those appearing in the rating table 

 for the in. i. i used. 



Computation "l th- <piantitie to fill in the remaining col- 

 nf tin- form are made a* follows: 



Column 



6. Shows the velocity of the water as given by the meter 

 at the point noted in column i, and is taken from that column 

 of the rating table at the head of which appears the numb* 



uli. .n- -lio\\ii in column .">, opposite the number of M*cond 

 1 m e.ilnnm 4. G>lumns 3, 4, 5 and 6 are completely filled 

 m lor each line on which an observation is not 



7. The in. -.MI velocity in the vertical at any measuring 

 i i- th- average of tin- velocity observations made in that 

 al. When a single velocity observation is made in any 



\ . MI. .il ill.- value shown in column 7 will be the same as that 

 >ho\%n in column 6. 



8. To get the mean in the section, or partial area, take 

 values for consecutive verticals from column 7 and write their 

 average in column 8. 



9. The number of square feet in each section or partial 

 area shown in this column is the product of the mean depth 

 given in column 10, and the width as gi\en in column 11. ob- 

 tained from notes in column 1 as explained lor that column. 



10. The mean depth of each partial area is computed by 

 averaging the depth (column 2) at each vertical with the depth 

 (column 2> at the following vertical. 



1 1. The width is the <iitl< n nee between the distances from 

 the initial point of consecutive verticals. 



\'2. The discharge for each section or partial area is the 

 product of factors given in columns 8 and 9. 



Not more than three significant figures should be usetl in 

 the computations. 



Columns 9 and 12 are added and the sum of the products 

 in column 12 divided 1>\ tho-e in column 9 to get the mean 



