CO Water Control Structures
Contractor Exam Practice Questions
And Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf.
1. Which condition is the primary purpose of a water control structure
such as a diversion dam, weir, or check structure?
A. To increase the uncontrolled velocity of water
B. To regulate, divert, measure, store, or safely convey water
C. To eliminate the need for downstream drainage
D. To prevent all sediment from entering a watercourse
Answer: B.
The fundamental purpose of a water control structure is to manage
water safely and predictably by regulating flow, diverting water,
measuring discharge, storing water, or controlling water levels.
2. Before construction begins on a water control structure in Colorado,
which document should the contractor rely on as the controlling
source for the structure's dimensions, materials, elevations, and
construction requirements?
,A. A manufacturer's advertising brochure
B. An informal field sketch prepared by a laborer
C. The approved construction drawings and project specifications
D. A previous project's drawings regardless of site conditions
Answer: C.
Approved construction drawings and specifications establish the
required dimensions, materials, tolerances, elevations, sequencing, and
other contractual requirements for the specific project.
3. What is the principal hydraulic concern when designing the
downstream face of a spillway?
A. Preventing all evaporation
B. Controlling flow velocity and dissipating excess energy
C. Increasing turbulence without limitation
D. Eliminating the need for foundation preparation
Answer: B.
Water accelerating down a spillway can possess substantial kinetic
energy, so the downstream system must safely control velocity and
dissipate energy to prevent erosion, scour, and structural damage.
4. What is the primary function of a stilling basin located downstream
of a spillway?
A. To store construction equipment
B. To increase upstream water pressure
,C. To dissipate hydraulic energy and reduce downstream flow velocity
D. To prevent groundwater from entering the structure
Answer: C.
A stilling basin is designed to dissipate excess hydraulic energy,
commonly through a hydraulic jump and associated turbulence, so that
downstream erosion and scour are minimized.
5. Which phenomenon occurs when rapidly flowing supercritical water
transitions to slower, deeper subcritical water?
A. Hydraulic jump
B. Capillary rise
C. Soil liquefaction
D. Pipe flotation
Answer: A.
A hydraulic jump is a rapid transition from supercritical to subcritical
flow accompanied by turbulence and substantial energy dissipation.
6. Why is foundation preparation particularly important beneath a
concrete water control structure?
A. It determines the paint color of the structure
B. It reduces the possibility of settlement, seepage, sliding, and bearing
failure
C. It eliminates the need for reinforcement
D. It guarantees that flooding cannot occur
Answer: B.
, A properly prepared foundation provides adequate bearing support and
helps control differential settlement, seepage, sliding, and other
mechanisms that can compromise structural stability.
7. Which condition is most likely to create piping beneath or around a
water control structure?
A. Properly compacted low-permeability material
B. Uncontrolled seepage through or along permeable zones
C. Correctly installed drainage filters
D. Properly sealed construction joints
Answer: B.
Piping occurs when seepage forces transport soil particles through
cracks, joints, foundations, or permeable zones, potentially creating
progressive internal erosion and structural instability.
8. What is the primary purpose of a cutoff wall installed beneath a
water control structure?
A. To increase the width of the roadway
B. To reduce seepage beneath the structure and lengthen the seepage
path
C. To provide decorative architectural detailing
D. To increase the evaporation rate
Answer: B.
Contractor Exam Practice Questions
And Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf.
1. Which condition is the primary purpose of a water control structure
such as a diversion dam, weir, or check structure?
A. To increase the uncontrolled velocity of water
B. To regulate, divert, measure, store, or safely convey water
C. To eliminate the need for downstream drainage
D. To prevent all sediment from entering a watercourse
Answer: B.
The fundamental purpose of a water control structure is to manage
water safely and predictably by regulating flow, diverting water,
measuring discharge, storing water, or controlling water levels.
2. Before construction begins on a water control structure in Colorado,
which document should the contractor rely on as the controlling
source for the structure's dimensions, materials, elevations, and
construction requirements?
,A. A manufacturer's advertising brochure
B. An informal field sketch prepared by a laborer
C. The approved construction drawings and project specifications
D. A previous project's drawings regardless of site conditions
Answer: C.
Approved construction drawings and specifications establish the
required dimensions, materials, tolerances, elevations, sequencing, and
other contractual requirements for the specific project.
3. What is the principal hydraulic concern when designing the
downstream face of a spillway?
A. Preventing all evaporation
B. Controlling flow velocity and dissipating excess energy
C. Increasing turbulence without limitation
D. Eliminating the need for foundation preparation
Answer: B.
Water accelerating down a spillway can possess substantial kinetic
energy, so the downstream system must safely control velocity and
dissipate energy to prevent erosion, scour, and structural damage.
4. What is the primary function of a stilling basin located downstream
of a spillway?
A. To store construction equipment
B. To increase upstream water pressure
,C. To dissipate hydraulic energy and reduce downstream flow velocity
D. To prevent groundwater from entering the structure
Answer: C.
A stilling basin is designed to dissipate excess hydraulic energy,
commonly through a hydraulic jump and associated turbulence, so that
downstream erosion and scour are minimized.
5. Which phenomenon occurs when rapidly flowing supercritical water
transitions to slower, deeper subcritical water?
A. Hydraulic jump
B. Capillary rise
C. Soil liquefaction
D. Pipe flotation
Answer: A.
A hydraulic jump is a rapid transition from supercritical to subcritical
flow accompanied by turbulence and substantial energy dissipation.
6. Why is foundation preparation particularly important beneath a
concrete water control structure?
A. It determines the paint color of the structure
B. It reduces the possibility of settlement, seepage, sliding, and bearing
failure
C. It eliminates the need for reinforcement
D. It guarantees that flooding cannot occur
Answer: B.
, A properly prepared foundation provides adequate bearing support and
helps control differential settlement, seepage, sliding, and other
mechanisms that can compromise structural stability.
7. Which condition is most likely to create piping beneath or around a
water control structure?
A. Properly compacted low-permeability material
B. Uncontrolled seepage through or along permeable zones
C. Correctly installed drainage filters
D. Properly sealed construction joints
Answer: B.
Piping occurs when seepage forces transport soil particles through
cracks, joints, foundations, or permeable zones, potentially creating
progressive internal erosion and structural instability.
8. What is the primary purpose of a cutoff wall installed beneath a
water control structure?
A. To increase the width of the roadway
B. To reduce seepage beneath the structure and lengthen the seepage
path
C. To provide decorative architectural detailing
D. To increase the evaporation rate
Answer: B.
