For clean sand reduce this by a factor of three. Therefore, d = 

 0.124 feet or 1-1/4 inches. 



Emplacement 



Maximum lowering rate, for the installation, 



A = (2 * L - B) * B = 70 square feet 



V = 1/4 * VW , -i A =0.95 feet per second (15) 

 max sub v 



Maximum lateral excursion during lowering 



r=50*A*d+W ,=23 feet (16) 

 1 sub 



Handling characteristics 



r, =5.6 feet 



h 



z, = 7 feet 

 h 



W , = 1045 pounds 

 sub 



W, = (910) * (1.14) + 350 = 1390 pounds 



Recovery 



Since the site is clean sand, there will be no breakout problem 

 once the tiedowns, if used, are disconnected. 



SUMMARY 



The design procedures presented herein, and exemplified by the 

 two preceding design examples, may be used for all non-manrated , non- 

 strategic, small seafloor structures which are to be located on a slope 

 of less than 10 degrees and which are not located in an area of very 

 rapid deposition such as near the mouth of a large river. In many 

 cases the guidelines presented here will provide an overdesigned founda- 

 tion (conservative design). However, this determination can only be 

 made where more detailed data on the site are available. When this is 

 the case, and parameters such as the sediment strength profile or 

 maximum bottom current need not be conservatively assumed, more precise 

 rules of design can be applied. These procedures are summarized 

 elsewhere. The design procedures outlined here should give a reliability 

 of 0.95 or slightly higher. 



25 



