75 



that the earth on the heel, together with the wall, will be 

 just as heavy as the example. The concrete steel beams 

 can be made strong enough to resist the same force which 

 will not overturn the wall as a whole. But a reinforced 

 wall so designed does not get the full benefit of the ad- 



PLATE II! 



vantages which it has over a gravity wall. So It is better 

 to use methods of design which are somewhat different 

 from those commonly used for retaining walls. The 

 formulas herein given determine the proper dimensions 

 which a wall should have to best resist failure, consider- 

 ing the pr< th thrust and the bearing power of 

 the foundation bed on which the wall is to be built. 



