1. The problem statement, all variables and given/known data Water flows at the end of an aqueduct into the upper end of a 500m long pipe. The pipe has angle of 30 degrees to the horizontal and its low end exits into the bottom of a collection tank. The collection tank can hold a depth of 120m, above the centre line of the delivery pipe exit. Extra liquid can overflow the lip of the tank into a river. The pipe tapers from a diameter of 2.0m at the top to 0.8m at the bottom. Assuming the head loss to be 8% of the potential head of the wateras it enters the pipe, determine the flow velocity of the water as it enters the collection tank. I have worked out two CSA's for the pipe and are stuck. Should I use bernoulli's equation or the continuity equation to work out the flow velocity of the water? 2. Relevant equations C1A1=C2A2=Q Z1+C1^2/2g+P1/ρg=Z2+C2^2/2g+P2/ρg+hL 3. The attempt at a solution A1=πd^2/4=πx2^2/4= 3.142 m^2 A2=πd^2/4=πx0.8^2/4= 0.503 m^2 I have got the CSA's but don't know whether to use bernoullis equation or the continuity equation to find the flow velocity.