Determine the minimum pressure Rmin, measured by a pres

Determine the minimum pressure Rmin, measured by a pressure gauge before the pipe is narrowed, at which the water will be sucked from the reservoir A in a narrow section of the pipe. The sizes are given: d1, d2, H1, H2. Take the resistance coefficients: nozzle ζс, diffuser ζdif.
Given: d1 = 58mm = 0.058m; d2 = 18mm = 0.018m; H1 = 6m; H2 = 0.8m; ζc = 0.085; ζdif = 0.3.
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