Estimate the rate of change of specific energy having bed slope S0 and slope of total energy line Sf.

• A. \(\frac{dE}{dx}\) = Sf – S0
• B. \(\frac{dE}{dx}\) = Sf – \(\frac{S_0}{2}\)
• C. \(\frac{dE}{dx}\) = S0 – Sf
• D. \(\frac{dE}{dx} = \frac{S_f}{2}\) – S0