MEASUREMENT AND DIVISION OF WATER. 
31 
One difficulty which arises in the use of the Cippoletti 
form, as well as the rectangular weir, in muddy waters, is 
the sediment which may deposit in the still water in front 
of the weir-board, but this in most places will not be a 
serious difficulty. 
While this module cannot be said to be free from ob¬ 
jection or disadvantages, it seems to possess the most 
merits of any known to the writer at present. 
A table follows giving the discharges over various weirs 
of the Cippoletti form. It will be noticed that the dis¬ 
charge over the two-foot weir is twice that over the one- 
foot for the same depth, and that in general the discharge 
is in proportion to the length. 
TABLES OF DISCHARGE. 
In the following tables of discharge over rectangular 
weirs and over trapezoidal weirs of the Cippoletti form, 
the tables hold true, with but small error, for weirs placed 
so as to satisfy the conditions given on page 27. 
For that portion of the table printed in bold-faced 
type, the difference between the actual and calculated dis¬ 
charges will not be likely to exceed 1 per cent. 
For small depths the actual discharge may exceed the 
amount here given by 2 to 5 per cent. 
L. G. CARPENTER. 
