The area of a sloping surface of a protective embankment of mean height d,side slopes S:1 and length L is

- 1
  
  dxdxs
- 2
  
  sq. root [d^2 x (ds)^2]
- 3
  
  L.D sq. rt (1+s^2)
- 4
  
  2L.D sq. rt (1+s^2)

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