Source Water
Math
Cross Connection
Aeration
MCL's
100
This type of source water is relatively free from microbial contaminants but may have high amounts of dissolved gases and total dissolved solids such as iron and manganese.
What is groundwater?
100
Convert 91 F to Celsius.
What is 33 C ?
100
The undesirable reversal of flow of water or other substances into the potable water distribution supply.
What is backflow?
100
A foul, rotton egg odor from an aeration treatment unit is an indication that the source water contains this.
What is hydrogen sulfide?
100
The MCL for nitrate.
What is 10 mg/L
200
Pollution that can be traced back to a single source such as a sewage outfall or a discharge pipe from a factory.
What is point-source pollution?
200
A pump discharges 10,350 gal in 3 hours and 45 minutes. Find the pump rate in gallons per minute.
What is 46 gpm?
200
A device consisting of two check valves, test cocks and shutoff valves designed to prevent backflow.
What is a double check valve assembly?
200
Surface water usually contains low levels of this gas, but groundwater and very deep lakes may contain very high levels. It makes water more acidic and it reacts with lime, increases softening costs.
What is carbon dioxide?
200
The MCL for chlorine.
What is 4 mg/L?
300
This type of source water typically has higher turbidity, suspended solids, and microbial contaminants. The water quality fluctuates seasonally and with precipitation events.
What is surface water?
300
A 3 ft diameter main has just been installed. According to the Design Criteria for the State of Tennessee, the minimum flushing velocity is 2.5 ft/sec. The main is flushed at a velocity of 3 ft/sec, find how many gallons per minute will be flushed from the hydrant.
What is 9512 gpm?
300
The required air gap seperation distance for a 6 inch diameter pipe.
What is 12 inches?
300
The two types of aeration.
What is water into air and air into water?
300
The MCL for manganese.
What is 0.05 mg/L?
400
The difference between the original water level (static water level) in a well and the level of the water when the well is pumping.
What is the drawdown?
400
A pipe has a diameter of 24 inches. The pipe is flowing full, and the water is known to flow a distance of 200 ft in 3 minutes. Find the flow rate for the pipe in MGD.
What is 2.25 MGD?
400
Backflow preventers must be inspected and tested at least this often.
What is every 12 months?
400
This type of aerator has the influent water flow through a tower filled with packing material while air is forced in through a blower. This is most often used in the treatment of VOC's.
What is an air stripper/packed tower aerator?
400
The MCL for iron.
What is 0.3 mg/L?
500
The condition that occurs in reservoirs when cooler, denser water at the surface sinks toward the bottom and warmer water at the bottom of the reservoir is pushed upward.
What is turnover?
500
The flow through a pipe is 320 gpm. The velocity through the pipe is 3.6 ft/sec. Find the diameter of the pipe in inches.
What is 6 inch?
500
The minimum air gap seperation distance required for a 1/4 inch diameter pipe.
What is one inch?
500
Name two gases produced during aeration that may pose a danger.
What are Hydrogen sulfide, methane,and radon?
500
The MCL for trihalomethanes.
What is 0.08 mg/L?