Determine the area of the orifice in the riser pipe in the retention basin in Problem 10.3...

Determine the area of the orifice in the riser pipe in the retention basin in Problem 10.37 such that 95 percent of the surcharge storage is discharged from the reservoir in 48 hours. The retention basin capacity table is listed below. Use an orifice discharge coefficient of 0.6. Assume the surcharge storage volume is equal to the permanent pool storage volume.

Problem 10.37

Determine the volume of a retention basin permanent pool for a 100-ha (247-ac) high-density residential development in Dallas, Texas. Use hydrologic soil group D with a 6 percent slope.