HYDROGRAPHY 



61 



As illustrated below, short sections of broken curves on the sxirvey sheets should be con- 

 nected if the configuration of the bottom revealed by other curves in the area being charted 

 indicates that it would be logical. 



HYDROGRAPHIC SURVEY 



CHART 



When necessary to omit some depth curves on steep slopes, the deepest curve (and the 

 shoalest if space permits) should be retained and the less important intermediate ones omitted. 

 Curves must never run abruptly into each other or into the shore, but must be curved to make 

 them parallel as is the case in nature. The cm^e to which the blue tint on the printed chart is 

 to be shown shall be given preference over all other curves and shall be as complete as possible. 



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Deepest and Shoalest Curves 

 No tint involved 



Tint Curve Unbroken 

 18 ft. curve 



Deepest Curve 

 Maximum width channel 



Depth curves around depressions are of httle value and, in general, should be omitted, 

 but they shall be shown when they reveal features which may have some value in navigation, 

 or when they indicate on which side of a river the deepest water may be found. 



CHART 



