266 



From all sources of information on surface currents, 

 it can be stated that outside the littoral zone velocities 

 of greater than 0.6 MPH are rare, those of the order of 

 0.4 MPH are infrequent, and usual velocities are 0.3 MPH or 

 less. Maximum velocities are usually found in the southern 

 inshore portion of the bay. 



More important than the maximum velocities for special 

 regions such as the southern end of the bay, are the data 

 obtained from the stations located at the approximate sites 

 of the proposed sludge and effluent outfalls. In no case was 

 a velocity greater than 0.58 MPH recorded from a sludge or 

 effluent outfall station. The single case of a majximum 

 velocity greater than 0.31 MPH was recorded from the effluent 

 station on June 19, 1956„ These figures are significant 

 because the velocities represent the limits within which coli- 

 form organisms from primary effluent of the type found at 

 Hyperion will be reduced to legal specifications at the beach. 

 This matter is discussed in detail in the section of the 

 report of the University of Southern California which deals 

 with the bacteria, but the general conclusion is that under 

 the conditions specified, the coliform standards as now 

 established by the State Water Pollution Board probably will 

 be met. 



Velocities in excess of those values will occur in the 

 central part of the bay, but it is believed that the frequency 

 of such rapid flow will certainly be less than 20%. 



