Water at 20C (layer depth H) flows from an open tank to

Water at 20C (layer depth H) flows from an open tank to the atmosphere. The coefficients of hydraulic losses of the valve ζvent and nozzles ζс, pipe lengths L1, L2, L3 = L4, their diameters d1 = d2 = d3, and d are the nozzle diameter at the outlet. The absolute equivalent roughness of all pipes Δe. Find the flow rate.
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