Hydro Power Power transmission P1, V1
From the free surface of the reservoir to the exit point at 2, with friction loss H V, q, f factor, f, an energy balance (J/kg) gives . l 𝑔𝑧 · 𝑔𝑧 P2, V2
With z2 as zero, the energy at 2 is 𝑃 𝑉 4𝑓. 𝑙 𝑉 2 2 𝑔 𝑧 𝑧 · ρ 2 1 2 𝑑 2
and (with P1 and V1 zero) the power delivered (W) is