Volume 2 Flashcards
(100 cards)
- (201) Storm drains should not be used except where the slope of the ground is not suited for ditches, gutters, flumes; and where
a. natural drainage can be used.
b. space is restricted.
c. safety is not a factor.
d. traffic is light.
b. space is restricted.
- (201) Which of these conditions is a function of subsurface drainage?
a. To lower the water table.
b. To drain underground lakes.
c. To intercept seepage or underground springs.
d. All of the above.
d. All of the above.
- (202) The method to lay out an area for drainage structures primarily depends on
a. location.
b. distance to be covered.
c. amount of rainfall expected.
d. type of building equipment used.
Na
- (202) If you are installing culverts or storm drains, the bottom of the trench should be
a. shaped to fit the pipe.
b. shaped the same as the sides.
c. filled with select filter material.
d. filled with a layer of impervious soil.
a. shaped to fit the pipe.
- (202) Notches are left in the center of check dams to
a. prevent washouts.
b. retard the water flow.
c. prevent silt settlement.
d. allow for the normal flow of water.
d. allow for the normal flow of water.
- (202) How can you eliminate silting inside a culvert when the grade must be flatter than the inlet ditch grade?
a. Use a spillway at the outlet.
b. Use a sump at the inlet.
c. Build a headwall.
d. Flare the end walls.
b. Use a sump at the inlet.
- (202) What can you do if you want to funnel water into the inlet of a culvert?
a. Build a headwall.
b. Install a drop inlet.
c. Flare the end walls.
d. Build a spillway.
b. Install a drop inlet.
- (203) Intercepting subsurface drainage is required when
a. space is limited.
b. the water table is low.
c. groundwater is within 1 foot of the pavement.
d. groundwater is within 1 foot of the base course.
d. groundwater is within 1 foot of the base course.
- (203) What type of structure is constructed by filling a ditch or trench with broken or crushed rock?
a. Storm drain.
b. French drain.
c. Vertical dry well.
d. Intercepting drain.
b. French drain.
- (203) French drains are not recommended for permanent construction because they have a. inadequate slope.
b. a tendency to silt up.
c. a tendency to overflow.
d. the ability to carry only a low amount of water.
b. a tendency to silt up.
- (203) You should treat the bottom of vertical dry wells with calcium chloride or hay to
a. raise the water table.
b. lower the water table.
c. assist in drainage.
d. prevent freezing.
d. prevent freezing.
- (203) Holes in perforated pipe should be placed up when
a. the structure is to be placed along the side of the pavement.
b. the structure is to be placed under the pavement.
c. slope is not a factor.
d. the grade is steep.
a. the structure is to be placed along the side of the pavement.
- (203) After you place either your impervious soil layer or filter material for a subsurface structure, make sure the bottom of the trench is
a. shaped to fit the pipe.
b. at the correct slope.
c. in a V-shape.
d. rounded.
a. shaped to fit the pipe.
- (204) What type of drainage inspection should you do during or immediately after a rainstorm?
a. Riding.
b. Walking.
c. Operational.
d. Maintenance.
c. Operational.
- (205) Where a drain line is blocked because of pipe collapse, you should find the blockage by
a. flushing with high-pressure water.
b. probing with cleaning rods.
c. using a plumber’s snake.
d. digging up the line.
b. probing with cleaning rods.
- (205) What can you do to correct erosion in front of a check dam?
a. Heighten the dam.
b. Build a spillway.
c. Expand the side walls.
d. Build additional dams.
b. Build a spillway.
- (205) To control erosion at the outlet end of a culvert, you should
a. build a spillway with concrete.
b. flare the end walls.
c. install a plank headwall.
d. install a check dam.
a. build a spillway with concrete.
- (205) You should install a drop inlet at the end of a culvert to
a. increase water flow.
b. prevent erosion.
c. control silting.
d. act as a funnel.
c. control silting.
- (205) If a subsurface drain becomes clogged, it can be cleaned by
a. hauling off debris.
b. flushing with detergents.
c. flushing with high-pressure water.
d. blowing it out with high-pressure air.
c. flushing with high-pressure water.
- (206) Which soil horizon is the base for all types of pavement construction?
a. A.
b. B.
c. C.
d. D.
b. B.
- (206) Which soil classification is made up of sand and gravel in the “B” horizon and has 50 percent or less material passing the No. 200 sieve?
a. Coarse-grained.
b. Fine-grained.
c. Organic.
d. Plastic.
a. Coarse-grained.
- (207) If you are laying out an area for concrete, how many inches on each side should you allow for the width of the forms?
a. 2.
b. 4.
c. 6.
d. 8.
c. 6.
- (207) What is the only real difference between laying out a large area and a small area?
a. Terrain.
b. Weather conditions.
c. Equipment available.
d. Amount of work.
Na
- (207) You should place the first centerline stake for concrete at the
a. first curve.
b. end of the first curve.
c. beginning of the project.
d. end of the project.
c. beginning of the project.