Alabama Wastewater Collection Grade 1
C Exam 2026 Questions and Answers
A flow of 60 gph is equal to?
a. 1 mgd
b. 1mg/L
c. 10 gpm
d. 1 gpm - Correct answer-d. 1 gpm (60 gph / 60 min/hr )
The slope of a sewer is measured by
a. The difference from the crown to the invert
b. The difference in invert elevations over the length
of the pipe
c. Using the diameter of the pipe
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,d. Only entering the manhole - Correct answer-b. The difference in invert
elevation over the length
of the pipe
An air gap can be used to
a. Clean sewer blockages caused by grease
b. Let air into manholes
c. Prevent backflow of wastewater into a drinking
water supply
d. Test for oxygen deficiency in manholes - Correct answer-c. Prevent backflow of
wastewater into a drinking
water supply.
A cross connection is
a. Cast Iron pipe connected to concrete pipe
b. Steel pipe connected to asbestos pipe
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,c. Potable (Drinkable) water pipe connected to a supply
of questionable origin
d. Lateral line connected to an interceptor - Correct answer-c. Potable (Drinkable)
water pipe connected to a
supply of questionable origin
Wastewater carried in a collection system may come from
a. Digester supernatant
b. Exfiltration
c. Primary settling tank
d. Inflow - Correct answer-d. Inflow
When using any hydraulic sewer cleaning method, care must be taken by the
operator
a. To always plug the downstream manhole
b. Not to cause flooding in homes and businesses
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, c. To prevent any sir gap from occurring
d. To throttle flows from the hydrants by using
the hydrant valve only - Correct answer-b. Not to cause flooding in homes and
businesses
Disease producing bacteria are called
a. Saprophytic
b. Facultative
c. Pathogenic
d. Parasitic - Correct answer-c. Pathogenic
A manhole with a center grating is normally used for
a. Venting
b. Storm sewers
c. Sanitary sewers
d. None of the above - Correct answer-b. Storm sewers
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
C Exam 2026 Questions and Answers
A flow of 60 gph is equal to?
a. 1 mgd
b. 1mg/L
c. 10 gpm
d. 1 gpm - Correct answer-d. 1 gpm (60 gph / 60 min/hr )
The slope of a sewer is measured by
a. The difference from the crown to the invert
b. The difference in invert elevations over the length
of the pipe
c. Using the diameter of the pipe
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,d. Only entering the manhole - Correct answer-b. The difference in invert
elevation over the length
of the pipe
An air gap can be used to
a. Clean sewer blockages caused by grease
b. Let air into manholes
c. Prevent backflow of wastewater into a drinking
water supply
d. Test for oxygen deficiency in manholes - Correct answer-c. Prevent backflow of
wastewater into a drinking
water supply.
A cross connection is
a. Cast Iron pipe connected to concrete pipe
b. Steel pipe connected to asbestos pipe
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,c. Potable (Drinkable) water pipe connected to a supply
of questionable origin
d. Lateral line connected to an interceptor - Correct answer-c. Potable (Drinkable)
water pipe connected to a
supply of questionable origin
Wastewater carried in a collection system may come from
a. Digester supernatant
b. Exfiltration
c. Primary settling tank
d. Inflow - Correct answer-d. Inflow
When using any hydraulic sewer cleaning method, care must be taken by the
operator
a. To always plug the downstream manhole
b. Not to cause flooding in homes and businesses
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, c. To prevent any sir gap from occurring
d. To throttle flows from the hydrants by using
the hydrant valve only - Correct answer-b. Not to cause flooding in homes and
businesses
Disease producing bacteria are called
a. Saprophytic
b. Facultative
c. Pathogenic
d. Parasitic - Correct answer-c. Pathogenic
A manhole with a center grating is normally used for
a. Venting
b. Storm sewers
c. Sanitary sewers
d. None of the above - Correct answer-b. Storm sewers
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
