If a subsurface outlet terrace is to store 50 mm of runoff from a 10-year return period, 24-h duration storm, determine the orifice opening size to remove this volume in 48 hours. Assume an average pressure head of 1.5 m at the orifice, an orifice discharge coefficient of 0.6, and a runoff area above the terrace of 1 ha.



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