TOPOGRAPHY 47 



II 

 Culture: Shore and Offshore Structures 



PIERS (G-9) 



Piers should be numbered in accordance with the Port Series pubUcation unless it is super- 

 seded by later information. Piers should be shown with a double line where space and/or 

 scale permit; in general, on charts at 1:40,000 scale ^nd larger. 



JETTIES AND BREAKWATERS (G-6, -8, -8a, -Ga) 



On charts 1:40,000 scale and larger, it is desirable that jetties and breakwaters be shown 

 with a double line. However, where space and/or scale do not permit, they may be shown by a 

 single hue. Submerged portions shall be shown by dashed lines and the limits of the submerged 

 base, when known, shall be shown by a dashed Hue. 



PILES, DOLPHINS, ETC. (G-21, H-9, L-59, O-30) 



Piles, dolphins, stakes, and pipes shaU be represented by a small circle with a description. 

 When they show above the plane of Mean High Water, use upright lower-case letters with the 

 first letter capitalized, thus" "PUe," "Stake," "Pipe." When the object is submerged, labels 

 in italics are to be used, thus: "Subm ■pile," "Subm stake," "Subm pipe." 



Where several pUe symbols are charted, the preferred label is "Piling." Where space is 

 limited, the label "PUes" may be used and the abbreviation "Dol" may be used for dolphin. 



Extensive areas of piHng shall be shown by a dashed line and labeled "Pihng." If the 

 pihngs are arranged in rows, representative rows of dashed Unes shall be charted. If no pat- 

 tern is apparent, the outer limit of the area shall be charted with the label "PUing" in the center. 



For objects used as channel markers, refer to "Private Aids," page 85. 



SEWERS (H-11) 



A sewer extending out from the high water line is shown in magenta by a dashed line and 

 labeled "Sewer." 



FENCES 



A fence extending into the water is shown by a dashed line and is labeled "Fence," if room 

 for the word is available. 



PLATFORMS (0-Ob, -Oc) 



An offshore platform shall be represented by a solid square symbol and labeled "Plat- 

 form." The square shall measure 1 .25 mm. on a side except in narrow rivers or congested areas 

 where it may be made smaller. 



Offshore oU well structures are described in detail under hydrographic dangers, page 66. 



