California Water Distribution Operator Exam, Distribution Math: all 36 questions
All questions from the Distribution Math section for California Water Distribution Operator Exam, each with the correct answer.
- 7001How many gallons does a 500-foot section of 12-inch water main hold?
- 7002How many gallons are needed to fill 1,000 feet of 8-inch main?
- 7003A rectangular tank is 20 feet long, 10 feet wide and holds water 8 feet deep. What is its volume?
- 7004A cylindrical storage tank is 30 feet in diameter and holds water 20 feet deep. About how many gallons does it hold?
- 7005A trench is 200 feet long, 3 feet wide and 5 feet deep. How many cubic yards of soil are excavated?
- 7006How many pounds of pure chlorine are needed to dose a 2,000-foot, 8-inch main to 25 mg/L?
- 7007How many pounds of chlorine gas are needed to dose 0.25 million gallons of water to 2.0 mg/L?
- 7008How many pounds of 65 percent calcium hypochlorite are needed to dose 0.5 MG of water to 3.0 mg/L?
- 7009How many gallons of 12.5 percent liquid hypochlorite (assume 8.34 lb per gallon) are needed to dose 1.0 MG of water to 2.0 mg/L?
- 7010A water sample has a chlorine demand of 1.8 mg/L and the operator wants a free chlorine residual of 0.5 mg/L. What dose is required?
- 7011Water flows at 3 feet per second in a 12-inch pipe. What is the flow in gallons per minute?
- 7012A tank water level is 92.4 feet above a pressure gauge. What gauge pressure is shown?
- 7013A pressure gauge reads 65 psi. What is the equivalent head in feet?
- 7014A pump delivers 350 gallons per minute. How many gallons does it deliver in one day?
- 7015A system uses 1.44 million gallons per day (MGD). What is the average flow in gpm?
- 7016A well with an 8-inch casing has 120 feet of water standing in it. About how many gallons of water are in the casing?
- 7017The static water level in a well is 45 feet and the pumping level is 72 feet. What is the drawdown?
- 7018What is the cross-sectional area of an 18-inch pipe, in square feet?
- 7019A 12-inch valve is closed against 60 psi. What is the total force on the valve face?
- 7020A 50,000 gallon tank is filled at 250 gpm. How long will it take to fill an empty tank?
- 7021A meter reads 482,500 gallons on May 1 and 497,200 gallons on May 15. What is the average daily use over those 14 days?
- 7022What is the velocity in a 12-inch pipe that carries 1.0 MGD? (1 MGD = 1.55 cfs)
- 7023What is the capacity of an 8-inch pipe flowing at 4 feet per second, in gallons per minute?
- 7024A cylindrical tank is 40 feet in diameter and 25 feet high. What is the area of the interior side wall to be sprayed with disinfectant?
- 7025The thrust on a bend is 12,000 pounds and the soil can bear 2,000 pounds per square foot. What bearing area is needed on the thrust block?
- 7026Water contains 0.5 mg/L of ammonia-nitrogen. How much chlorine is needed to reach a 4:1 chlorine to ammonia-nitrogen ratio?
- 7027A pressure gauge on a well discharge reads 18 psi at ground level, with the pump off and a closed valve. How many feet of water is above the gauge?
- 7028On a system map, 1 inch equals 400 feet. A main measures 3.5 inches on the map. What is the actual length?
- 7029A 120,000 gallon tank has 200 gpm flowing in and 700 gpm flowing out. How many hours until the full tank is empty?
- 7030A chemical feed pump delivers 120 mL per minute. How many gallons per day is this?
- 7031How many pounds of chlorine are needed to raise 2.4 MG of water by 1.5 mg/L?
- 7032How many mg/L are in a 0.5 percent chlorine solution?
- 7033A trench is 150 feet long, 3 feet wide and 6 feet deep. A 12-inch pipe 150 feet long is laid in it. What is the trench volume in cubic yards?
- 7034A system uses 25 pounds of chlorine per day at $0.90 per pound. What is the daily chemical cost?
- 7035How many gallons are in 300 feet of 6-inch service main?
- 7036A reservoir surface measures 40 feet by 20 feet. How many gallons are held by each foot of depth?