CXDNTENTS 



Pcige 



Introduction 1 



Acknowledgment 2 



Innovations in the design of the Mill Creek standpipe 2 



Theoretical discussion and laboratory calibration of the 



standpipe 4 



Theoretical discussion 4 



Application of factors peculiar to the Mill Creek 



standpipe 5 



Outline of steps in calibrating Mill Creek stcindpipe ... 7 



Expaanation of steps taken in calibrating Mill Creek 



standpipe 8 



Calibration results 13 



Operation of the Mill Creek standpipe in the field 13 



Obtaining a dissolved oxygen sample 14 



Percolation tests 14 



Percolation test procedure 17 



Dissolved oxygen and velocities in gravel compared with 



spawn survival 17 



Discussion and conclusions 18 



Literature cited 19 



