THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. 119 
sluice or ditch of uniform width, its cross section may be estimated 
and its velocity taken. This method, however, is not very ac¬ 
curate. The following are methods which give fairly accurate 
results with little trouble and in short time. All that is necessary 
for the purpose is that the water be discharged through a pipe of 
uniform diameter, a foot rule, still air, and care in taking measure¬ 
ments. 
“Two methods are proposed, one for pipes discharging vertical¬ 
ly, which is particularly applicable before the well is permanent¬ 
ly finished, and one for horizontal discharge, which is the most 
frequent way of finishing a well. For measuring a vertical flow 
we have extended a method which was first used by Mr. P. E. 
Fig. io.—Illustrating method of measuring the flow of an artesian 
well from horizontal and vertical pipes. After Todd. 
Manchester, C. E., of Chamberlain, who published a table adapted 
to large wells, in the Chamberlain Register, December, 1895. 
“The table below is adapted to wells of moderate size as well as 
to larger. In case a well is found of other diameter than that 
given in the table its discharge may be obtained without much 
difficulty from the table by remembering that other things being 
equal the discharge varies as the square of the diameter of the pipe. 
If, for example, the pipe is one-half inch in diameter its discharge 
will be one-fourth of that of a pipe one inch in diameter, whose 
stream reaches the same height, so also a pipe eight inches in 
diameter may be obtained by multiplying that of the four-inch 
pipe by four. 
“In the first case the inside diameter of the pipe may be mea¬ 
sured, then the distance from the end of the pipe to the highest 
