CONTENTS 



Page 



Installation of first experimental electromechanical 



weir and trap in 195*1 2 



Operation and testing procedures 7 



Summary of results in 19!?1 <. 8 



Installation .of electrical sea lamprey barriers in 1952 11 



Kewaunee River electromechanical weir and trap.. 12 



Squaw Creek electromechanical weir and trap 16 



Hibbards ' Creek electrical barrier 17 



Carp Creek electrical barriers 19 



Operation and testing procedures 



(1) Use of checking weirs 21 



( 2 ) Physical measurements 21 



(3) Electrical measurements 23 



Power consumption 23 



Voltage gradients 2h 



Bottom resistance measurements 27 



Electrode effectiveness. 27 



Summary of results in 195>2 



(1) General 30 



(2) Minimum voltage gradient requirements. 31 



(3) Electrode array pattern, circuitry, and 



power requirements 32 



(U) Electrode size, conformity, and efficiency 37 



(5>) Electrode mounting 38 



(6) Effects of water level, water resistivity, 



and bottom resistivity on power drain UO 



(7) Power sources. Ill 



(8) Costs of installation and operation k3 



Recommendations i;5 



Acknowledgments J>1 



Literature cited 5-1 



