1. The problem statement, all variables and given/known data Use the incompressible version of Bernoulli’s equation to estimate the flow-velocity when water from the top of a reservoir, 100 m above the river, reaches the river via a pipe. (neglect the atmospheric pressure change, and assume the water is flowing into the river at atmospheric pressure). If this flow was inside a pipe, calculate the pressure rise expected, based on Bernoulli’s equation, when the flow is stopped suddenly. 2. Relevant equations Having a problem with this question assigned by my teacher. Using Bernouli's equation I simplified my expression from to V1^2 = 981 + V2^2 (neglecting the small chance in absolute pressure, and h at the bottom is zero). 3. The attempt at a solution In the equation I wrote above V1 is the velocity at the bottom, and V2 at the top. Now my question is, how do we figure out the velocity at the top? Do we assume it to be zero? Or is there some way we can calculate it? 31.32m/s is my answer assuming it to be zero... but that's an assumption I can't be sure of. How exactly do we solve the 2nd part of this quesstion as well? I guess P1 is our atmospheric pressure, P2 is what we need to find.. and V2 would be zero, but what about the initial velocity and height? Where do we get those from as well? Help would be appreciated.