Desigji Problem Prelim i nary Desi gn 



Poge no 



Calculated by: j J. /?. V- 



76 of /33 



Check;:d by: 



15 Men 73 



Revetmenf Design (cont) 



Thickness of Armor La y ers, First underlo ger 



r= nk. 



W]^ 



JL) 



r = layer thickness in ft. 



n = numk>er of it'ones or armor units 

 comprising . /•/?<? loijer (either armor 

 layer or first under layer) 



W = freight of indiyiduQl stones making 

 up the layer in pounds. 



Wr = unit N eight of stone material 

 (concrete or quarrystone) 



Number of Stones Required 



p 



^^-A"^'^('-£W 



Nr " number of armor units or stones. 



% 



Pi = area in ft 



P~ porosity in percent 



Thickness of Armor Lacier 



(n-Z) 



Table continued on next page 



^ kA^2 from Table 7-10 



£q. 7-106 



Eg. 1-IOj 



8-76 



