251 



Over most of the bay waves, whether due to local winds 

 or to swell coming from distant storm areas, will result in 

 only a small net transport in their direction of progress, 

 but inshore they play an important role in establishing a 

 littoral drift. 



There is some evidence that the large quantities of 

 warm, fresh water introduced into the bay by the Hyperion 

 disposal plant, Ballona Creek, and the two Edison Company 

 steam plants may cause local modifications of flow. 



There are no data at present upon which these factors 

 can be satisfactorily isolated and their relative importance 

 determined, but we can deal with observational data which 

 will show variations in net effects. 

 Surface Film 



The behavior of surface films or of floating objects 

 whose bulk lies largely above the surface of the water did 

 not come within the scope of this survey. Neither did the 

 collection of meteorological data upon which predictions of 

 the behavior of such films from the region of the proposed 

 outfalls can be made. The only statement possible is the 

 general one that if an appreciable wind is present, surface 

 films will be transported in the direction of the wind at 

 a velocity greater than that of the water beneath. During 

 periods of relative calm or during periods of strong winds 

 when the surface is broken by extensive white-caps, their 

 drift will correspond more to that of the upper layers of 

 water. 



