32 EMBANKMENT WHEN ONE FACE IS SLANTING. 



h*= [2c2 + 3(2c + ft)]^-, (4) 



which agrees with (5) of Art 18. 



COR. 2. If the embankment is rectangular, c = 0, and 

 (4) becomes 



which agrees with (6) of Art. 18. 



(2) Suppose the embankment to yield to the pressure of 

 the fluid by sliding along the horizontal base AB. 

 The horizontal pressure of the fluid, from (1), is 



PI = Wi ; 



the vertical pressure of the fluid is 



The weight of the embankment is 



a + b, 

 s *w ; 



and the entire vertical pressure of the embankment and the 

 water on its face is 



a + b . 



hw -f kdhiVi 

 & 



= (aw + bw 4- dwt) \h. 



Let ft = the coefficient of friction ; then the friction 

 between the embankment and the surface of the ground on 

 which it rests is (Anal. Mechs., Art. 92), 



(aw 4- biv 4- dw t ) ^hft. 



When the horizontal pressure of the water pushes the 

 embankment forward, we must have 



j = (aw -f bw + dw 



