Catch basins are grate-covered boxes placed in low-lying areas to prevent drainage problems on roads and parking lots. Water and debris flow into the box, with solids settling on the bottom. As the water level rises, it exits through an outlet trap and flows into the local sewer system. Setting a catch basin involves 13 steps: calling 811 to locate utilities, laying out the placement, setting grade with a laser level, excavating the hole, preparing the excavation with a stone bed, inspecting rigging equipment, setting the basin, installing and grouting the pipe, backfilling layers of 6 inches and compacting, installing the grate, final grading, and cleaning up the site.

1. Catch Basin

2. Catch basins are a vital component to any road
drainage design. These grate-covered boxes are
available in a range of materials and sizes. They are
placed in areas where water collects to prevent any
drainage problem in roads and parking lots. Water
and solid particles flow into the box, with the solids
settling in the bottom. As the water level rises, it
reaches the outlet trap and flows into the local sewer
system or watershed.

3. Steps to set a catch basin

4. Step 1 Call 811
Call 811 this is the phone number you use before digging. This protects
yourself and others from unintentionally hitting underground utility lines.

5. Step 2 Lay Out
Lay out is a important step when setting a catch basin. The reason for
this is saving time, materials cost and a voiding utilities.

6. Step 3 setting up for grade
- Set up rotary laser level a tool used in many construction works. It helps guide
the construction worker to level or can be used to perform slopes.
- Find grade by tacking a shoot of the area where the catch basin will be placed.
- Measure the catch basin height to determine how high to set up you rotary laser
level.

7. Step 4 Starting the excavation
-Start digging out for catch basin remove top soil, blacktop or concrete first.
Stock pile off to the side or load it to dump truck to be hauled away.
-Once the top layer is off start to dig out spoils stock pile off to side or load in to
dump truck to be hauled away.

8. Step 5 prepare excavation for catch basin
- In most catch basin sets an over dig of 6 inches is required for a bed of stone or concrete.
The bed is used to level the catch basin.

9. Step 6 inspect Rigging equipment
 Tag present, and legible
 Broken wires
 Wear or scraping
 Kinks , Crushing, Bird Caging, or any
distortion of the rope.
 Heat damage
 End attachment, or Hook damage

10. Step 7 set catch basin
-Setting the catch basin is a dangerous task. Rigging is to be inspected as well as the lifting
heavy equipment should be looked over for leaks and load capability.
-Hook rigging up to catch basin and lower in to the hole.

11. Step 8 install pipe
Step 1 - Cut the Pipe to length
Step 2 - Rig pipe up to be placed in excavation if necessary
Step 3 - Slide pipe in to catch basin till the pipe is flush

12. Step 9 grout in pipe
Grout application is one of the most important steps in concrete and corrugated
pipe installation, yet its importance can be underestimated . The grout seals the
water from leaching down the side of the pipe so as not to cause under ground
erosion.

13. Step 10 backfill excavation
1. Backfill trenches and excavations immediately after the pipes are laid, unless
other protection is directed or indicated.
2. Select and deposit backfill materials with special reference to the future safety of
the pipes and catch basin.
3. In the lower portion of the trench, deposit approved backfill and bedding material
in layers of 6" maximum thickness, and compact with suitable tampers to the
density of the adjacent soil until there is a cover of not less than 12" using special
care not to damage pipe .
4. Except for special materials for pavements, backfill the remainder of the trench
with material free from stones larger than 6" or ½ the layered thickness, whichever
is smaller, in any dimension.
5. Under roads, streets, and other paved areas:
Mechanically tamp in 6" layers using heavy duty pneumatic tampers or equal.
Tamp each layer to a density equivalent of not less than 100% of an ASTM D698
Proctor Curve.
6. Provide additional compaction by leaving the backfilled trenches open to traffic
while maintaining the surface with crushed stone.

15. Step 11 install grate

16. Step 12 final grade
Once up to grade now it is time to concrete, black top, stone or topsoil.

17. Step 13 Clean up site
The construction process involves a large amount of materials and
employees who are often working on a tight schedule. It's no surprise then,
that at the end of most projects the site is quite messy, full of debris, extra
materials and dirt. Before the project can be considered complete, the site
must be cleared of all construction materials and the project must be
cleaned from top to bottom.

18. Thank you for your time

19. TEST
1. When marking utility lines blue paint is _____________.
A. Sewers and drain lines
B. Reclaimed water, irrigation and slurry lines
C. Drinking water

20. 2. When inspection alloy chains what are two things to look
for?
_____________________
_____________________

21. 3. When starting to dig for a catch basin what are some of
the top layer materials?
__________________________________________________

22. 4. When grouting pipes in to catch basin you should grout
the out side first.
A. TRUE
B. FALSE

23. 5. In the lower portion of the trench, deposit approved
backfill and bedding material in layers of ______maximum
thickness.
A.12 inches
B.18 inches
C. 6 inches
D.24 inches