Water moves at a pressure pipe with a diameter of d, mm

Water moves at a pressure pipe with a diameter of d, mm, the temperature of which is 10 ° C. Determine the flow rate in l / s at which the change of driving mode occurs.
  Given: pipe diameter d = 18 mm = 0.018 m; water temperature t = 10 ° С.
Determine: volumetric flow Q at which a change in driving mode occurs.
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