1. Velocity in Pipe, Compressible Flow

Air flows in a duct with dimensions 40 cm x 40 cm (8 x 8) and the temperature is 10 C. If the mass rate is 0.1 kg/s, whats the velocity of the air flow?

2. Water Resource Problem involving a retention pond

A rainfall event of Intensity equal to 6 per hour (30 minute duration) falls on a 100 acre lot and 50% of this volume is retained in a retention pond. If the ponds footprint is 5 acres, whats the required height with a 5 foot freeboard?