Irrigation Engineering
If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

x = d2 / r2
x = r2 d2
x = d1 / r1
x = r1 d1

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Irrigation Engineering
Which one of the following statements is correct?

The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
The canal system and the drainage system are complementary
All listed here

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