The Venturi Flume I'J 
The number of tests and the variety of conditions under which they 
were performed, seems to warrant the conclusion that with proper 
precaution quite dependable results may be expected. 
The installation of the rectangular Venturi flume should offer 
no difficulty as to construction or setting. Either concrete or 
wood may be used, but for the larger sizes and where permanency 
is required, concrete is recommended. 
The flume should be located in the most desirable place with 
reference to alignment of ditch and grade. The floor elevation 
should agree with the grade line or bottom of the ditch in order that 
there will be no tendency to deposit silt or sand at the ends of the 
structure. If placed below grade, for small differences in head, 
the velocity within the flume is relatively low and would tend to 
silt the floor and cause trouble by stopping the pipe connections to 
the observation wells. It is recommended that the floor be a little 
above the grade rather than too low. The floor should be level in 
both directions and if constructed of concrete, should be given a 
