For a full circular pipe, A=πD²/4=.63585 m² and R=D/4=.225 m. Full flow is $Q_f=(1/.013)(.63585)(.225)^{2/3}\sqrt{.004}\approx1.1444$ m³/s. Ratio=.15/Qf≈**.13**. Use full hydraulic radius D/4,not the physical radius D/2.
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