228 



only one card from Station 4502 was picked up (near Portuguese 

 Bend ) . 



A total of 491 cards were released, of which 154 (31%) 

 have been returned. At the time of writing returns were 

 still incomplete, but the number of recoveries is sufficient 

 to make it improbable that any important departure from this 

 description will occur. 



Maximum drift velocities were from three inshore (3-mile) 

 stations, 4495, 4504, and 4510 and amounted to 5 3/4 to 6 3/4 

 miles per day (0.24 - 0.28 MPH). 

 Cruise of August 20-21 , 1956 



At the time this report was written returns were incom- 

 plete, 52 cards out of 491 having been recovered. However, 

 all of these returns are consistent in showing a strong 

 northerly trend (Fig. 112) with no evidence of divergence. 

 Many cards, particularly those from the outer stations, were 

 returned from the Malibu area. Two recoveries were made 

 about 30 hours after release, and all others were at least 

 48 hours after release (including 15 from the sludge station 

 and 3 from the effluent station). Maximum velocities were 

 8 miles in 30 hours, or 0.27 MPH from Station 4638 on the 

 southernmost line of stations, and all others were less than 

 0.17 MPH. 

 Drift Card Results from Sludge and Effluent Outfall Stations 



Current directions and velocities from the sludge and 

 effluent outfall stations are of particular interest. For this 

 reason they are discussed separately in this section. Results 

 from each cruise are presented in Figures 113 to 125, inclusive. 



