Calculate the minimum value of h_{2} that is necessary to guarantee an outgoing flow of 28.3 L/s from the tank of the plant shown, with a relative pressure of 3.44 × 10^{5} Pa in the terminal section E. The flow divides into two equal parts at junction G. The duct is hydraulically smooth plastic, d = 150 mm; take f = 0.014 and neglect bend and other minor losses. h_{1} = 3.00 m, h_{3} = 1.80 m, L_{1} = 180 m, L_{2} = 270 m. All pipes are 150 mm in diameter; include friction in the vertical drop pipe (length h_{2} + h_{3}) as well as in L_{1} and L_{2}. (answer in m)