Values of k^ and P, determined experimentally, are presented in Table 

 7-10. Tlie average dimension for a range of quarrystone weights based on 

 a Linit weight of 165 pounds per cubic foot is shown in Table 7-11. 



NOTE: Average Dimension (ft.) is the solution for Equation 7-108, where n = 1, w = 165 lbs. /ft. and 

 k^= 1.15 for quarrystone. (See Table 7-10.) 



d. Bottom Elevation of Primary Cover Layer . The armor units in 

 the cover layer (the weights are obtained by Equation 7-105) should be 

 extended downslope to an elevation below minimum SWL equal to the design 

 wave height, H, when the structure is in a depth > 1.5H, as shown in 

 Figure 7-95. When the structure is in a depth < 1.5H, armor units 

 should be extended to the bottom as shown in Figure 7-96. Toe conditions 

 at the intersections of slope with bottom may be critically unstable. 

 Model studies should be made when economically feasible. 



e„ Structure Head and Lee Side Cover Layer . Armoring of the head 

 of a breakwater or jetty should be the same on the lee side slope as on 

 the seaside slope for a distance of about 50 to 150 feet from the struc- 

 ture end. This distance depends on such factors as structure length and 

 crest elevation at the seaward end. 



7-198 



