Apr. 23, 1917 
The Venturi Flume 
129 
CONCLUSION 
The Venturi flume is not an exact measuring device, but it is thought 
to be sufficiently accurate to meet usual practical needs, especially such 
as are encountered in irrigation practice in the West. 
Although experiments have been made only on the smaller sizes of 
Venturi flumes, it seems reasonable to expect that structures built 
according to the general plans will be applicable to the measurement of 
streams of considerable size, with an accuracy compatible with field 
requirements. 
The Venturi flume seems to fulfill the conditions of being free of 
trouble from sand, silt, or floating trash; requires little loss of head for 
making the measurement; is a structure that is simple to build, easy to 
operate, and has a comparatively low cost; and is free from error in 
measurement due to aquatic growth or other changes in the channel, 
provided the floor of the flume is not below the grade of the channel. 
If the accompanying discharge curves, formulas, or tables are to be 
used, it is essential that the Venturi flume be built according to the 
general plans and the gages for measuring the head be placed as shown 
in the plans. Alterations of the plans or position of gages will necessitate 
a recalibration for the new arrangement. 
A public patent has been applied for which will permit the manufacture 
or use of this flume by the public without the payment of royalties. 
78372°—17-3 
