Harnessing kinetic energy from impact of rain water

I read in a science magazine that you would be able to generate more energy by collecting a mass of water and tipping it through a turbine than from generating energy from the impact of that mass of water as individual raindrops. Now this may simply be to do with the technology we have that can't collect enough useful energy from the impact of rainwater as opposed to turbines



But what confused about this is that that mass of water as rain has fallen from a great height where it has reached terminal velocity and so should have much more kinetic energy than merely being tipped from a small height.



I should mention that I do not have or am doing a degree in physics so I apologise if I'm being dumb, but was just very curious.