vertical pile (shown dotted on Figure 12). If wave action in the range 

 of 2- to 3-foot heights occurs at the site, an additional pile in each 

 bent to carry lateral loads should be provided. Plank barriers are to 

 be considered only as supplements to any primary wave protection neces- 

 sary for the marina site. 



A layout plan for a floating marina with sections through the boat 

 walkways is shown in Figure 13o 



1. Pier Dimensions. 



The pier length is established in accordance with the number and 

 widths of berths which are to be built alongside. The typical pier 

 width is usually 8 or 9 feet wide. The pier deck is located a minimum 

 of 3 feet above the mean high water level. 



2. Design of Pier Framing, Supports, and Bracing . 



The framing arrangements, and the minimum thicknesses and sizes of 

 members for deck planking and bracing timbers, are guided largely by 

 conventional practice. The deck stringers are proportioned for a 

 design uniform live load of 75 pounds per square foot of deck area. 



The pile bents are spaced to suit the design of the deck stringers, 

 with two piles in each bent. The specified deck loading usually does 

 not determine the number and spacing of supporting piles, which are 

 driven to a minimum bearing capacity of 10 tons, or minimum penetration 

 of 10 feet. 



36 



