Select the correct option to test your answer: A 500 to 750 liters/hour/m 2 B 1000 to 1250 liters/hour/m 2 C 1250 to 1500 liters/hour/m 2 D 1500 to 2000 liters/hour/m 2 Correct Answer: Option A (500 to 750 liters/hour/m 2) Verified correct option for Civil Engineering (Environmental Engineering).