Question

If E1 and E2 are the specific energies at the start of back water curve and at the maximum rise of water respectively and ib and ie are the head slope and the energy line slope respectively, the length of back water (L) is given by


Options:
A .  `L = (E_2 + E_1)/(ib - ie)`
B .  `L = (E_2 - E_1)/(ib - ie)`
C .  `L = (E_2 - E_1)/(ib + ie)`
D .  None of these.
Answer: Option B


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