So when the velocity of v1 and v2 is 0 (because the tanks are much bigger), the bernoulli equation to dh is dh = (dp-dpl)/(rho*g)
with dp = Phyd / V = 1000W / 0.01m³/s = 10^5 Pa and rho = 1000 kg/m³
So I am getting first without the pressure loss on the orifice dh = 10^5 Pa / (1000 kg/m³ *...