Figure lo~. — Jet from Notched ^eir 

 (Model - Alden Hydraulic Laboratory) End view of pool E (see diagram 

 Figure 1?) of model. 



Figure 17. — Flow through Notched Weir 

 (Model - Alden Hydraulic Laboratory) Side view of pools D and E (see 

 diagram Figure 12) of model. Note that fish can swim from one pool to 

 another (no "jump" necessary). Note also rapid divergence of jet. 



17 



Interior — Duplicating Section — Washington, D.C. 



2903 



