WEIRS 



385 



HOLES FOR lOd 

 GALVANIZED NAILS 

 AT 4" 4"0.C 



Figure D-1. (Top) Diagram of a Cippoletti weir plate. It should be cut from 

 No. 8 or No. 10 galvanized iron plate. The trapezoidal notch must be cut to the 

 exact dimensions as shown. Flov^ rates with this weir will be twice the values 

 shown in Table D-1. (Bottom) A rectangular weir installed to measure water 

 flow at the discharge of a fish hatchery. A sight gauge (insert) with a float in an 

 aluminum cylinder is used to measure water depth over the crest of the weir. It 

 must be positioned at a distance at least 2.5 times the depth of the water flowing 

 over the weir. 



