Exam Study Guide: Filtration Rate Math Question

When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to study and prepare for exam questions. Take a look at this sample water treatment licensing question along with an explanation of the correct answer.Sample question:An operator closes the influent valve on a gravity filter and notices the water level drops eight inches in two minutes. What is the filtration rate in gpm/ft2 of surface area?A) 0.67 gmp/ft2B) 5.0 gmt/ft2C)10 gpm/ft2D) 2.5 gpm/ft2The correct answer is D, 2.5 gpm/ft2 because 8 ÷ 12 = 0.67'; 0.67' x 1' x 1' x