Water Distribution Operator 1 & 2 Exam | Most Recent Exam
2026 Actual Complete Real Exam Questions And Correct Answers
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Restraining Fittings
Fittings used to prevent pipe movement in locations where the use of a
thrust block is not an option (e.g. around existing utilities and structures).
Spoil
The soil excavated from a trench.
Thrust block
- A large mass of concrete that is installed between the fitting being
restrained and the
undisturbed soil that surrounds it.
Thrust Anchor
Steel rods anchored in large masses of concrete that are attached to the
pipe or fitting that is being restrained
,Tie Rods
A variation of a restraining fitting that is used to restrain mechanical joint
fittings when a thrust block cannot be used due to an obstruction.
should be at least 18 inches above or below, and for 10
feet 10ft feet
Local regulations
When a water main crosses a sewer line, water main should be at least ___
inches above or
below, and for ___ feet on either side of the crossing, the sewer line should be
made from either
ductile iron with mechanical or push on joints or PVC with mechanical joint
couplings
___feet between water mains and sanitary sewer lines that are
running parallel Local should be consulted for the requirements
in this area of the
installation
Ductile Iron, PVC
When a water main crosses a sewer line, water main should be at least 18
inches above or
below, and for 10 feet on either side of the crossing, the sewer line should
be made from either ____________ with mechanical or push on joints or with
mechanical joint
couplings
10 feet between water mains and sanitary sewer lines that are
running parallel Local regulations should be consulted for the
requirements in this area of the installation
,Trench Depth
Minimum cover required is usually 2 1/2 feet for water mains and 18 inches for
water services
well graded granular
One inch
12%
Bedding material must be clean, ________________ material that is no more than
_ __ inch in size
and must have no more than _ % clay or silt in
1:1
Average soils require an angle of repose of ___ to prevent a trench cave-in
(horizontal distance : vertical distance)
, 1 1/2 : 1
Compacted sharp sand requires an angle of repose of to prevent a trench
cave-
in (horizontal distance : vertical distance)
2:1
Well rounded loose sand requires an angle of repose of to prevent a trench
cave-in (horizontal distance : vertical distance)
6%
When laying bell and spigot connecting (push-on joint) pipe on a hill with
a slope greater than , it is easier to install when the bells are on the
uphill side.
Thrust, perpendicular
The hydraulic force called __ caused by a water surge almost always acts
_ _______ to the inside surface that it pushes against.
Thrust control
Restraining fittings are _______ devices used in locations where there are a lot
of
existing utilities or structures.
1/2 : 1
Compacted Crushed Rock requires an angle of repose of to prevent a trench
cave-in (horizontal distance : vertical distance)
2026 Actual Complete Real Exam Questions And Correct Answers
(Verified Answers) Already Graded A+ |Guaranteed Success!!
Newest Exam | Just Released!!
Restraining Fittings
Fittings used to prevent pipe movement in locations where the use of a
thrust block is not an option (e.g. around existing utilities and structures).
Spoil
The soil excavated from a trench.
Thrust block
- A large mass of concrete that is installed between the fitting being
restrained and the
undisturbed soil that surrounds it.
Thrust Anchor
Steel rods anchored in large masses of concrete that are attached to the
pipe or fitting that is being restrained
,Tie Rods
A variation of a restraining fitting that is used to restrain mechanical joint
fittings when a thrust block cannot be used due to an obstruction.
should be at least 18 inches above or below, and for 10
feet 10ft feet
Local regulations
When a water main crosses a sewer line, water main should be at least ___
inches above or
below, and for ___ feet on either side of the crossing, the sewer line should be
made from either
ductile iron with mechanical or push on joints or PVC with mechanical joint
couplings
___feet between water mains and sanitary sewer lines that are
running parallel Local should be consulted for the requirements
in this area of the
installation
Ductile Iron, PVC
When a water main crosses a sewer line, water main should be at least 18
inches above or
below, and for 10 feet on either side of the crossing, the sewer line should
be made from either ____________ with mechanical or push on joints or with
mechanical joint
couplings
10 feet between water mains and sanitary sewer lines that are
running parallel Local regulations should be consulted for the
requirements in this area of the installation
,Trench Depth
Minimum cover required is usually 2 1/2 feet for water mains and 18 inches for
water services
well graded granular
One inch
12%
Bedding material must be clean, ________________ material that is no more than
_ __ inch in size
and must have no more than _ % clay or silt in
1:1
Average soils require an angle of repose of ___ to prevent a trench cave-in
(horizontal distance : vertical distance)
, 1 1/2 : 1
Compacted sharp sand requires an angle of repose of to prevent a trench
cave-
in (horizontal distance : vertical distance)
2:1
Well rounded loose sand requires an angle of repose of to prevent a trench
cave-in (horizontal distance : vertical distance)
6%
When laying bell and spigot connecting (push-on joint) pipe on a hill with
a slope greater than , it is easier to install when the bells are on the
uphill side.
Thrust, perpendicular
The hydraulic force called __ caused by a water surge almost always acts
_ _______ to the inside surface that it pushes against.
Thrust control
Restraining fittings are _______ devices used in locations where there are a lot
of
existing utilities or structures.
1/2 : 1
Compacted Crushed Rock requires an angle of repose of to prevent a trench
cave-in (horizontal distance : vertical distance)
