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FRAME AND VANED GRATE
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OR 12"
ONE #3 BAR HOOP FOR 6" HEIGHT
TWO #3 BAR HOOPS FOR 12" HEIGHT
RECTANGULAR ADJUSTMENT SECTION
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#3 BAR EACH CORNER
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#3 BAR HOOP
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#3 BAR EACH SIDE
#3 BAR EACH WAY
PRECAST BASE SECTION
NOTES
1. As acceptable alternatives to the rebar shown in the PRECAST BASE
SECTION, fibers (placed according to the Standard Specifications), or
wire mesh having a minimum area of 0.12 square inches per foot shall
be used with the minimum required rebar shown in the ALTERNATIVE
PRECAST BASE SECTION. Wire mesh shall not be placed in the
knockouts.
2. The knockout diameter shall not be greater than 18". Knockouts shall
have a wall thickness of 2" minimum to 2.5" maximum. Provide a 1.5"
minimum gap between the knockout wall and the outside of the pipe.
After the pipe is installed, fill the gap with joint mortar in accordance
with Standard Specification 9-04.3.
3. The maximum depth from the finished grade to the lowest pipe invert
shall be 5'.
4. The frame and grate must be installed with the flange down.
5. The Precast Base Section may have a rounded floor, and the walls may
be sloped at a rate of 1:24 or steeper.
6. The opening shall be measured at the top of the precast base section.
7. All pickup holes shall be grouted full after the basin has been placed.
8. All grade rings and castings shall be set in mortar in accordance with
Standard Specification 9-04.3.
#3 BAR EACH CORNER
18" MIN.
#3 BAR HOOF
SEE NOTE 1
ALTERNATIVE PRECAST BASE SECTION
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y PUBLIC WORKS CATCH BASIN TYPE 1 P STD. PLAN - 200.20
DEPARTMENT (FOR PARKING LOT)
If MARCH 2008