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OPTIONAL suBGRAD� MONOLITHIC CATCH
BASIN CONNECTION
SECTION A -A
END AND WELD SURFACE F'LOWLINE
TO MAINTAIN FINISHED SURF'ACE-
NG IN PLANE OF 5 nonnt1/4')R
ED SURFACE —� (TYPICAL)---?,.,
CUT B
ANGLE
GRATIN
A '*--SURFACE FLOWLINE
2-L 102 mrmx76 rmnx13 mmx1575 mm
(4'x3'xl/2"x62') FOR 2 GRATES
ADD 660 mm(2'-2') PER EACH
ADDITIONAL GRATE
PLAN
OPTIONAL, ROUGHENED
CONSTRUCTION JOINT
(TYPICAL)
GRATINGS AND
MODIFIED FRAME
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SECTION B-8
STRUCTURAL DATA
WALL AND SLAB DIMENSIONS AND
REINFORCEMENT REQUIREMENTS
NO. OF
GRATES
MAX
Y
+
REINFORCEMENT
FOR
WALLS AND SLABS
2-3
1.2 m(4')
150 mm(6')
NOT REQUIRED
2-3
2.4 m(8')
200 mm(S")
2-3
3.0 m(10')
250 mm(100)
2-3
3.5 m(121)
250 mm(10')
REQUIRED
4-6
1.2 m(4')
150 mm(6')
HOT REQUIRED
4-6
2.0 m(7')
200 mm(8')
4-6
2.4 m(8')
200 mm(8')
REQUIRED
4-6
3.5 m(12')
250 mm(108)
7-9
1.2 m(49)
150 mm(60)
NOT REQUIRED
7-9
1.8 m(6')
200 mm(8')
7-9
2.4 m(S')
200 mm(80)
REQUIRED
7-9
3.5 m(12')
250 mm(10')
>9
1.2 m(41)
150 mm(60)
>9
2.4 m(8')
200 mm(86)
>9
3.5 m(12'1
250 mm(100)
AMERICAN PUBLIC WORKS ASSOCIATION - SOUTHERN CALIFORNIA CHAPTER
PROMULGATM IWTM4E GRATING CATCH BASIN — ALLEY STAnO�R��PIAN
KJN,.IC WORKS STANDARDS OC.,
GREENBOOKCOMMITTEE (TRANSVERSE)., -305,o2
1"4Rte' IM USE WITH STANDARD SPECIFICATIONS FOR PUBLIC WORKS CONSTRUCTION SHEET t OF 2
SOURCE: A.P.W.A.
1. ALL CURVED CONCRETE SURFACES SHALL BE FORMED BY CURVED FORMS, AND SHALL NOT BE SHAPED BY PLASTERING.
2. TWO GRATINGS ARE REQUIRED UNLESS OTHERWISE SHOWN ON THE PROJECT PLATS.
3. FLOOR OF BASIN SHALL BE GIVEN A STEEL TROWEL FINISH AND SHALL HAVE A LONGITUDINAL AND LATERAL SLOPE OF 1.12. MINIMUM AND 1.3 MAXIMUM. SLOPE
FLOOR FROM ALL DIRECTIONS TO THE OUTLET.
4. DIMENSIONS:
V = THE DEPTH AT THE INVERT OF THE INLET. NOTED ON THE PROJECT PROFILE DRAWING.
W -- 1308 mm(4'-3 1/2") FOR TWO GRATINGS.
A = THE ANGLE, IN DEGREES, INTERCEPTED BY THE CENTERLINE OF THE CONNECTOR PIPE AND THE CATCH BASIN WALL TO WHICH THE CONNECTOR PIPE IS
ATTACHED; A = 90 DEGREES.
5. PLACE CONNECTOR PIPES AS INDICATED ON THE PROJECT PLANS. UNLESS OTHERWISE SPECIFIED, THE CONNECTOR PIPE SHALL BE LOCATED AT THE
DOWNSTREAM END OF THE BASIN. THE PIPE MAY BE CUT AND TRIMMED AT A SKEW NECESSARY TO INSURE MINIMUM 80 mm(3") PIPE EMBEDMENT, ALL
AROUND, WITHIN THE CATCH BASIN WALL, AND 75 mm(3") RADIUS OF ROUNDING OF STRUCTURE CONCRETE, ALL AROUND, ADJACENT TO PIPE. ENDS.
6. STEPS SHALL BE LOCATED AS SHOWN. IF THE CONNECTOR PIPE INTERFERES WITH THE STEPS, THEY SHALL BE LOCATED ON THE OPPOSITE WALL. STEPS SHALL
BE SPACED 300 mm(12") APART. THE TOP STEP SHALL BE 175 mm(7") BELOW THE TOP OF THE GRATING AND PROJECT 65 mm(2-1/2"). ALL OTHER STEPS
SHALL PROJECT 130 mm(5").
7. THE FOLLOWING STANDARD PLANS ARE INCORPORATED HEREIN:
308 MONOLITHIC CATCH BASIN CONNECTION
309 CATCH BASIN REINFORCEMENT
311 FRAME AND GRATING FOR CATCH BASINS
635 STEEL STEP -
636 POLYPROPYLENE PLASTIC STEP
8. DIMENSIONS SHOWN ON THIS PLAN FOR METRIC AND ENGLISH UNITS ARE NOT EXACT EQUAL VALUES. IF METRIC VALUES ARE USED, ALL VALUES USED FOR
CONSTRUCTION SHALL BE METRIC VALUES, EXCEPT REINFORCING BARS SIZES IN ENGLISH UNITS MAY BE SUBSTITUTED FOR METRIC BAR. SIZES. IF ENGLISH
UNITS ARE USED, ALL VALUES USED FOR CONSTRUCTION SHALL BE ENGLISH UNITS.
9. ADD #4 BARS AT 12" O.C. EACH WAY IN CATCH BASIN.