1. The problem statement, all variables and given/known data The question is stated here, though I'm happy to repost but they include a picture. I should say this is not homework, I'm doing problems for practice. http://web.mit.edu/2.25/www/5_pdf/5_04.pdf 2. Relevant equations Conservation of momentum/mass 3. The attempt at a solution Conservation of mass between stations 1 and 2 is ##h_1V_1=h_2V_2##. I'm unsure how to approach momentum since I would typically make my CV the fluid between stations 1 and 2, but there is viscous dissipation in the jump, as illustrated. Any ideas?