1. business and industrial
2. construction

2'-3" DIA.
1'-5"
MAXIMUM
9"
2'-0" DIA.
MINIMUM
OR
A
2'-0"
A
1'-4"
B
B
B
B
B
B
STEEL REINFORCEMENT SHALL
BE AS SPECIFIED IN CURRENT
ASTM C-478 (TYP.)
5"
HALF SECTION A - A
HALF SECTION A - A
3'-0" DIA.
HALF SECTION A - A
PLACE CASTING ON
4'-0" DIA.
LEACHING BASIN AS
DETAIL FOR
TOP OF MASONRY
PLACE CASTING ON
TOP OF MASONRY
PLACE CASTING ON CATCH
TOP OF MASONRY
STRUCTURE OR
INLET AS SPECIFIED
STRUCTURE OR
BASIN AS SPECIFIED ON
STRUCTURE OR
BOTTOM OF CASTING
ON PLANS
BOTTOM OF CASTING
PLANS
BOTTOM OF CASTING
COAT ON TOP 5'-0"
SHAPE MAY VARY FROM DETAIL SHOWN BUT MUST COMPLY
OF BRICK OR
WITH ASTM C-478 AND JOINTS SHALL BE COMPATIBLE
CONCRETE BLOCK
WITH THE RISER
PLACE COVER ON MANHOLE
2'-0" DIA. MIN.
AS SPECIFIED ON PLANS
2'-3" DIA. MAX.
CONSTRUCTION
FOR PLACEMENT
FOR PLACEMENT
FOR PLACEMENT
OF STEPS SEE
OF STEPS SEE
OF STEPS SEE
MANHOLE DETAILS
MANHOLE DETAILS
MANHOLE DETAILS
STRUCTURE DIA.
A
8"
8"
•" CEMENT PLASTER
1'-4" & 2'-0" TOP SECTIONS
PLAN VIEW
TOP OF MASONRY STRUCTURE
SPECIFIED ON PLANS
STRUCTURE DIA.
A
A
A
A
A
OR BOTTOM OF CASTING
(TYP.)
(TYP.)
1'-2" R
A
AND FLAT TOP SLABS
A
EMBEDMENT
(TYP.)
"
-0
4'
4" MIN. FOR 4'-0" DIA.
MATERIAL
CLASS II
LOOSE
1'-0"
AND 2'-0" TOP SECTIONS
A.
DI
2'-0" MIN.
* FOR SHORTER SECTIONS,
GRANULAR
SUMP
2'-0" MIN.
CONES
MIN.)
4"
8"
16"
MAX.
ON
4"
(TYP.)
SEE DETAIL FOR 1'-4"
3" MIN.
CONCRETE
CONCRETE
FOOTING
FOOTING
CONCRETE
4"
3'-4"
4"
FOOTING
5" MIN. FOR 5'-0" DIA.
5"
6" MIN. FOR 6'-0" DIA.
DIA. = 4'-8" +
DEPTH
(2 x WALL THICKNESS)
5'-0" DIA. OR
STEEL REINFORCEMENT SHALL
SEE MANHOLE DETAILS FOR SIZE AND BASE OPTIONS
SEE MANHOLE DETAILS FOR SIZE AND BASE OPTIONS
6'-0" DIA. IF
BE AS SPECIFIED IN CURRENT
SECTION B - B
SECTION B - B
SECTION B - B
INLET
CATCH BASIN
LEACHING BASIN
SPECIFIED ON PLANS
•
2"
MAX.
1'-6"
4'-0" DIA.
ASTM C-478
DIA. MIN.
AS SPECIFIED
(TYP.)
STEP (SEE NOTES)
3'-3"
LIFT PIN HOLE
8"
PLANS
TOP OF CASTING
*
BE 1'-6" BELOW
(2'-8"
TOP STEP TO
TAPERED
4'-0" DIA.
SEE MANHOLE DETAILS FOR BASE OPTIONS
* WALL THICKNESS SHALL MATCH
LIFT PIN HOLE
LIFT PIN HOLE
THICKNESS OF RISER WALL.
(TYP.)
(TYP.)
STEEL REINFORCEMENT
TONGUE AND GROOVE JOINT SHALL BE
LIFT PIN HOLE
(SEE NOTES)
MODIFIED TO FIT RISER SECTION
(TYP.)
INTEGRAL BASE OPTION
A
OPENING SIZE AS REQUIRED
CONCRETE FOOTING SHALL
E
UR
CT
RU
ST
BE 8" THICK FOR DEPTHS
TO 25'-0" AND 1'-0"
THICK FOR DEPTHS OVER
A.
DI
A
A
E
UR
CT
RU
ST
A
A.
DI
A
A
"
-0
2'
A.
DI
4"
STRUCTURE DIA.
* 6" OR 8"
STRUCTURE DIA.
* 6" OR 8"
6"
2'-0" DIA.
6"
6"
4"
1'-3"
3'-0"
25'-0"
STEEL REINFORCEMENT
(SEE NOTES)
TO 25'-0" AND 1'-0"
MIN.
2'-0"
MIN.
2'-0"
REQUIRED
BE 8" THICK FOR DEPTHS
MIN.
2'-0"
ELBOW AS
SEPARATE BASE OPTION
CONCRETE FOOTING SHALL
SECTION A - A
6"
SECTION A - A
6"
25'-0"
6"
THICK FOR DEPTHS OVER
TYPICAL MANHOLE
TYPICAL PRECAST REINFORCED
SECTION A - A
SECTION A - A
BOTTOM SECTION FOR DROP MANHOLE
SEE MANHOLE DETAILS FOR SIZE AND BASE OPTIONS
SEE TYPICAL BRICK AND BLOCK SECTION
PRECAST REINFORCED CONCRETE SHOWN
PRECAST SUMP
PRECAST SUMP FOR BRICK
PRECAST SUMP FOR
FOR PRECAST RISERS
OR BLOCK CONSTRUCTION
2'-0" DIA. STRUCTURES
SECTION A - A
FOR SIZE AND BASE OPTIONS
OTHER OPTIONS INCLUDE CONCRETE BLOCK, BRICK, OR CAST-IN-PLACE WALL SECTIONS
SEE TYPICAL WALL SECTIONS FOR WALL THICKNESS
DEPARTMENT DIRECTOR
MICHIGAN DEPARTMENT OF TRANSPORTATION
MICHIGAN DEPARTMENT OF TRANSPORTATION
Kirk T. Steudle
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
DRAINAGE STRUCTURES
DRAINAGE STRUCTURES
Michigan Department of Transportation
PREPARED
APPROVED BY:
DIRECTOR, BUREAU OF FIELD SERVICES
BY
DESIGN DIVISION
DRAWN BY:
B.L.T.
CHECKED BY: W.K.P.
6-11-2015
APPROVED BY:
DIRECTOR, BUREAU OF HIGHWAY DEVELOPMENT
F.H.W.A. APPROVAL
SHEET
R-1-G
PLAN DATE
AS-LET PLAN REVISIONS
0
NO.
DATE
AUTH
DESCRIPTION
NO.
DATE
AUTH
1
OF
6-11-2015
9
F.H.W.A. APPROVAL
DATE:
VERT. (FT)
DESCRIPTION
CS:
DESIGN UNIT:
Michigan Department of Transportation
0
HORZ. (FT)
FILE:
TSC:
JN:
PLAN DATE
SHEET
R-1-G
2
OF
9
DRAWING
SHEET
6"
12"
4"
1'-6"
2'-2"
1'-0"
(TYP.)
B
1'-5"
5'-0" DIA.
SECTION B - B
SECTION B - B
* D BARS MAY BE BENT AT A SMALLER
RADIUS RATHER THAN PARALLELING
RADIUS RATHER THAN PARALLELING
THE RADIUS IN THE DRAIN OPENING
THE RADIUS IN THE DRAIN OPENING
CONCRETE
BEVEL
8"
MORTAR
BEVEL
2'-0" DIA.
8"
12"
4"
3'-4"
8"
10"
2
3'-4"
* PAID FOR AS
AT 90° (TYP.)
STEEL REINFORCEMENT SHALL * D BAR 0.20 in.
STEEL REINFORCEMENT SHALL
BE AS SPECIFIED IN CURRENT
BE AS SPECIFIED IN CURRENT
AT 90° (TYP.)
ASTM C-478 (TYP.)
ASTM C-478 (TYP.)
CONCRETE FOOTING OR
CONCRETE FOOTING OR
CONCRETE FOOTING OR
BASE FOR WALL SECTION
BASE FOR WALL SECTION
BASE FOR WALL SECTION
7"
"
2
.
1
A
I
D
DROP INLET (TYPE 1)
10"
2
* D BAR 0.20 in.
9"
3'-6"
SECTION A - A
3'-6"
9"
7"
SECTION A - A
TYPICAL
TYPICAL
2'-0"
2'-0"
9"
9"
LAP
(TYP.)
1'-4"
LAP
1'-0"
4'-8" DIA.
45°
4"
9"
(TYP.)
B
45°
12"
A
6" R
LAP
* 3'-0"
BEVEL
9"
COAT
* D BARS MAY BE BENT AT A SMALLER
8"
OVER
MORTAR
PLASTER
8"
15'-0"
8"
45°
TO 15'-0"
OVER 8'-0"
BEVEL
OVER
TO 15'-0"
45°
BEVEL
15'-0"
OVER
MORTAR
•" CEMENT
S
A
R
F
O
O
F
T
D
E R
I
E
A
F WE
P
R SE
E
A
P
E "
I
N
P
I 12
L
OVER 8'-0"
45°
A
A
*
0 TO
0
6"
COAT
A
6" R
TAPERED
TO
PLASTER
15'-0"
8'-0"
BLOCKS
PORTION
3'-0" MIN.
BATTER
•" CEMENT
15'-0"
A
8"
BOTTOM OF CASTING
A
PORTION
* TAPERED
8'-0"
TO
0
TOP OF MASONRY OR
6"
BOTTOM OF CASTING
1'-6"
1'-4"
3'-0" DIA.
TOP OF MASONRY OR
6"
BOTTOM OF CASTING
ASTM C-478
AT 90°
1'-5"
* D BAR 0.20 in.
1'-5"
ASTM C-478
AT 90°
TOP OF MASONRY OR
BE AS SPECIFIED IN CURRENT
2
LAP
6'-0" MIN. FOR 6'-0" DIA. STRUCTURE
STEEL REINFORCEMENT SHALL
B
BE AS SPECIFIED IN CURRENT
(TYP.)
6 BLOCK MIN. FOR 6'-0" DIA. STRUCTURE
STEEL REINFORCEMENT SHALL
B
2
* D BAR 0.20 in.
1'-3"
6'-0" MIN. FOR 5'-0" DIA. STRUCTURE
2'-2"
* 5'-0" MIN. FOR 4'-0" DIA. STRUCTURE
6 BLOCK MIN. FOR 5'-0" DIA. STRUCTURE
1'-3"
* 4 BLOCK MIN. FOR 4'-0" DIA. STRUCTURE
SECTION A - A
PRECAST FLAT SLAB TOP FOR PRECAST
PRECAST FLAT SLAB TOP FOR
CONCRETE STRUCTURE, 2' x 4' CASTING
MASONRY STRUCTURE, 2' x 4' CASTING
CAST-IN-PLACE
CONCRETE
TYPICAL BRICK
WALL SECTION
WALL SECTION
WALL SECTION
TWO ADDITIONAL BARS IN THE BOTTOM
#5 BARS PLACE ON
CENTERED BETWEEN THE BOTTOM BARS
3"
TOP OF BOTTOM BARS
DROP INLET ( TYPE 1 )
(SEE TABLE FOR BAR SIZE)
B
3'-0" DIA.
B
3"
3"
B
B
"
6
1•
"
CONCRETE BLOCK
ONE ADDITIONAL BAR IN THE BOTTOM CENTER
BETWEEN THE FIRST AND SECOND BAR NEXT
A
K
4'-0"
DIA.
4"
4"
SEWER AND INLET
CONSTRUCTION
MI
N.
MIN.
L (TYP.)
3"
SECTION A - A
SECTION A - A
PLACE COVER ON
BOTTOM CENTER BETWEEN THE
TOP OF MASONRY
CATCH BASIN AS
TOP OF MASONRY
CATCH BASIN AS
FIRST AND SECOND BAR NEXT
STRUCTURE OR
SPECIFIED ON
STRUCTURE OR
SPECIFIED ON
TO HOLE
BOTTOM OF CASTING
PLANS
BOTTOM OF CASTING
PLANS
(SEE TABLE FOR BAR SIZE)
6
"
ONE ADDITIONAL BAR IN THE
PLACE COVER ON
THREE HANDLING HOLES
AT 120° SPACING
#5 BARS PLACE ON TOP OF
TABLE OF DIMENSIONS
BOTTOM BARS
A
A
A
PLAN
A
(SHOWING BOTTOM LAYER OF REINFORCEMENT)
PAID
6"
6"
(TYPE 2)
FOR AS
DROP INLET
FOR SEPARATELY
6"
6"
PAID
3'-0"
DIA.
6"
"
3'-6"
IN BOTTOM
1'-0"
JOINT BETWEEN
•
1
8"
#5 BAR 2'-10" LONG
2'-0" DIA.
TO HOLE (SEE TABLE FOR BAR SIZE)
A
27" DIA.
HOLE
2'-0"
2'-0"
DIA.
DIA.
COVER DIAMETER
#4 BARS AT 10" MAXIMUM
SPACING EACH WAY (TOP)
45°
STRUCTURE
COVER
DIAMETER
DIAMETER
* 4'-0"
5'-0"
BAR MAXIMUM SPACING
T
K
L
58"
6"
6"
8"
#5 AT 6"
72"
8"
7"
9"
#5 AT 7"
6'-0"
86"
8"
8"
10"
#5 AT 6"
7'-0"
101•"
12"
8ƒ"
11"
#5 AT 5"
8'-0"
114"
12"
9"
11"
#6 AT 6"
9'-0"
128"
12"
10"
12"
#5 AT 6"
10'-0"
140"
12"
10"
13"
#5 AT 6"
(BOTTOM EACH WAY)
PLUG
(MIN.)
T
FOOTING
2" DIA.
HOLE
DIA. = 2'-8" +
DIA. = 2'-8" +
BOTTOM OF INLET AND COMPACTED
(2 x WALL THICKNESS)
(2 x WALL THICKNESS)
SECTION B - B
SECTION B - B
INLET
CATCH BASIN
DRAINAGE STRUCTURE
1• "
BACKFILL SHALL BE PLACED TO
(TYP.)
FOOTING
27" DIA.
SUMP
CULVERT OR SEWER
SURFACE OF SEWER
K
8"
CUT TO INSIDE
CONCRETE
8"
REINFORCED CONCRETE
CONCRETE
2'-0" MIN.
EXCEPT 4'-0" DIAMETER
* ONLY BOTTOM LAYERS OF STEEL NECESSARY
DIAMETER
BEFORE CONSTRUCTING THE INLET
DROP INLET ( TYPE 2 )
SECTION A - A
PRECAST REINFORCED CONCRETE FLAT SLAB TOP
MICHIGAN DEPARTMENT OF TRANSPORTATION
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
DRAINAGE STRUCTURES
6-11-2015
F.H.W.A. APPROVAL
SHEET
R-1-G
PLAN DATE
AS-LET PLAN REVISIONS
0
NO.
DATE
AUTH
DESCRIPTION
NO.
DATE
AUTH
DRAINAGE STRUCTURES
3
OF
6-11-2015
9
F.H.W.A. APPROVAL
DATE:
VERT. (FT)
DESCRIPTION
CS:
DESIGN UNIT:
Michigan Department of Transportation
0
HORZ. (FT)
FILE:
TSC:
JN:
PLAN DATE
SHEET
R-1-G
4
OF
9
DRAWING
SHEET
B
4'-0"
D1
DIA.
REDUCER CAP DIMENSIONS
B
A
STRUCTURE
DIAMETER
B
4'-0"
CAP
CAP
B
DEPTH
DEPTH
"D1"
"D2"
7'-0"
101•"
"A"
8ƒ"
1'-5"
12"
8'-0"
114"
9"
1'-5"
12"
9'-0"
128"
10"
1'-5"
12"
10'-0"
140"
10"
1'-6"
12"
B
D2
DIA.
CAP
DIAMETER
HALF SECTION A - A
A
PRECAST REDUCER CAP
TOP OF MASONRY STRUCTURE
OR BOTTOM OF CASTING
B
2'-0"
DIA.
PLANS
D1
MIN.
B
2'-0"
DIA.
B
"A"
COVER
COVER
DEPTH
DEPTH
"D1"
"D2"
7'-0"
101•"
8ƒ"
1'-5"
12"
8'-0"
114"
9"
1'-5"
12"
9'-0"
128"
10"
1'-5"
12"
10'-0"
140"
10"
1'-6"
12"
D2
MIN.
COVER
DIAMETER
A
T
STRUCTURE DIAMETER
A
DEPTH AS SPECIFIED
DIAMETER
ON
STRUCTURE
DEPTH AS SPECIFIED
A
ON
PLANS
4'-0" DIA.
FLAT SLAB TOP DIMENSIONS
A
T
STRUCTURE DIAMETER
A
D1
D1
A
PRECAST FLAT SLAB TOP
A1
A1
SECTION B - B
SECTION B - B
SHOWING REDUCER CAP
SHOWING FLAT SLAB TOP
BASE AND RISER DIMENSIONS
BASE
BASE
MIN. WALL
BASE
BASE
DIAMETER
DIAMETER
THICKNESS
DEPTH
DEPTH
"A1"
"A2"
"T"
"D1"
"D2"
101•"
108"
7"
8"
12"
8'-0"
114"
128"
8"
8"
12"
9'-0"
128"
140"
9"
8"
12"
10'-0"
140"
154"
10"
8"
12"
STRUCTURE
DIAMETER
PRECAST MANHOLE
D2
7'-0"
A2
SEPARATE BASE OPTION
MICHIGAN DEPARTMENT OF TRANSPORTATION
MICHIGAN DEPARTMENT OF TRANSPORTATION
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
DRAINAGE STRUCTURES
DRAINAGE STRUCTURES
6-11-2015
F.H.W.A. APPROVAL
SHEET
R-1-G
PLAN DATE
AS-LET PLAN REVISIONS
0
NO.
DATE
AUTH
DESCRIPTION
NO.
DATE
AUTH
5
OF
6-11-2015
9
F.H.W.A. APPROVAL
DATE:
VERT. (FT)
DESCRIPTION
CS:
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Michigan Department of Transportation
0
HORZ. (FT)
FILE:
TSC:
JN:
PLAN DATE
SHEET
R-1-G
6
OF
9
DRAWING
SHEET
B
B
B
B
HALF SECTION A - A
TOP OF MASONRY STRUCTURE
OR BOTTOM OF CASTING
OR BOTTOM OF CASTING
MIN.
A1
SECTION B - B
SECTION B - B
SECTION B - B
SECTION B - B
SHOWING REDUCER CAP
SHOWING FLAT SLAB TOP
SHOWING REDUCER CAP
SHOWING FLAT SLAB TOP
MICHIGAN DEPARTMENT OF TRANSPORTATION
MICHIGAN DEPARTMENT OF TRANSPORTATION
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
DRAINAGE STRUCTURES
DRAINAGE STRUCTURES
SHEET
R-1-G
PLAN DATE
0
NO.
DATE
AUTH
A
PRECAST CATCH BASIN
AS-LET PLAN REVISIONS
DESCRIPTION
STRUCTURE DIAMETER
A1
F.H.W.A. APPROVAL
AUTH
T
A1
6-11-2015
DATE
A
A1
PRECAST INLET
NO.
A
SUMP
STRUCTURE DIAMETER
D1
T
MIN.
A
SUMP
A
2'-0"
STRUCTURE DIAMETER
D1
T
2'-0"
ON
A
DEPTH AS SPECIFIED
A
D1
STRUCTURE DIAMETER
D1
T
DEPTH AS SPECIFIED
ON
DEPTH AS SPECIFIED
A
ON
PLANS
4'-0" DIA.
ON
PLANS
4'-0" DIA.
DEPTH AS SPECIFIED
PLANS
TOP OF MASONRY STRUCTURE
PLANS
HALF SECTION A - A
7
OF
6-11-2015
9
F.H.W.A. APPROVAL
DATE:
VERT. (FT)
DESCRIPTION
CS:
DESIGN UNIT:
Michigan Department of Transportation
0
HORZ. (FT)
FILE:
TSC:
JN:
PLAN DATE
SHEET
R-1-G
8
OF
9
DRAWING
SHEET
R
VE
CO
N.
MI
#4 BARS
1•
"
A
A
1'-3" MIN. LAP
1•" TO
6"
2'-0" DIA.
6"
MIN.
#4 BAR (TYP.)
* 6"
2" COVER
SECTION A - A
*
WHEN RISER TONGUE LENGTH IS GREATER THAN 3",
USE 2 TIMES THE TONGUE LENGTH.
NOTE:
PRECAST RISER SHALL FULLY ENGAGE THE TONGUE
OF THE RISER PIPE.
PRECAST RISER RING
(FOR 2'-0" DIAMETER STRUCTURE)
NOTES:
THE DRAINAGE STRUCTURE COVERS ALLOWED FOR USE ON THESE DRAINAGE
THE NUMBER OF PIPE OPENINGS IN A RISER SHALL BE DETERMINED BY
STRUCTURES ARE SPECIFIED IN SUBSEQUENT STANDARD PLANS AND ARE
THE DESIGNER.
INTERCHANGEABLE ON ANY STRUCTURE.
OPENINGS MAY BE CONSTRUCTED BY CASTING OR BY DRILLING THE CURED
SPACING BETWEEN OPENINGS SHALL BE 1'-0" MINIMUM.
CONCRETE.
THE TOPS OF MASONRY STRUCTURES SHALL BE SUFFICIENTLY LOW TO PERMIT
PROPER ADJUSTMENT OF COVER TO GRADE USING MORTAR OR BRICK AS
PRECAST CONCRETE FOOTINGS OR BASES SHALL BE REINFORCED WITH #4
DIRECTED BY THE ENGINEER.
BARS SPACED AT 1'-0" BOTH WAYS OR WITH TWO LAYERS OF WELDED WIRE
FABRIC OF EQUIVALENT CROSS SECTIONAL AREA LAID AT RIGHT ANGLES AND
PREMIUM JOINTS ARE REQUIRED ON ALL SANITARY MANHOLES.
SEE ASTM
WIRED TOGETHER.
REINFORCEMENT SHALL BE PLACED IN TOP OF FOOTING
DESIGNATION C-923.
AND SHALL BE MARKED.
GRANULAR MATERIAL CLASS III SHALL BE USED IN BACKFILLING AROUND ALL
PRECAST CONCRETE FOOTINGS SHALL BE SUPPORTED BY A COMPACTED 6"
STRUCTURES THAT FALL WITHIN THE 1:1 INFLUENCE LINES FROM THE EDGE
GRANULAR SUBBASE.
OF PAVEMENT OR BACK OF CURB.
THE MINIMUM WALL THICKNESS FOR ALL 2'-0", 4'-0", 5'-0", AND 6'-0"
STEPS FOR DRAINAGE STRUCTURES SHALL BE OF AN APPROVED DESIGN AND
DRAINAGE STRUCTURES USING CONCRETE BLOCK, BRICK, OR CAST-IN-PLACE
MADE FROM CAST IRON, ALUMINUM, OR PLASTIC COATED STEEL.
CONCRETE SHALL BE AS SPECIFIED IN TYPICAL WALL SECTIONS.
RUNGS
SHALL BE A MINIMUM OF 10" IN CLEAR LENGTH, DESIGNED TO PREVENT THE
FOOT FROM SLIPPING OFF THE END.
LOAD SHALL BE 400 LBS.
THE MINIMUM HORIZONTAL PULL OUT
THE MINIMUM VERTICAL LOAD SHALL BE 800 LBS.
THE CONICAL SECTION OF MANHOLES OR CATCH BASINS CONSTRUCTED OF BLOCK
OR BRICK SHALL BE SHROUDED WITH GEOTEXTILE FABRIC TO A MINIMUM DEPTH
OF 5'-0" OR THROUGH THE FROST ZONE.
ENOUGH GEOTEXTILE MATERIAL
THE BELL SHALL BE REMOVED FOR THE FIRST LENGTH OF OUTLET PIPE
SHALL BE LEFT ON THE TOP (8" OR MORE) TO ROLL OVER THE TOP OF THE
PROJECTING THROUGH THE WALL OF THE MANHOLE.
CONE.
PRECAST CONCRETE SECTIONS, SUMPS, AND FLAT TOP SLABS SHALL BE BUILT
PREFORMED HIGH DENSITY POLYSTYRENE FILLER PIECES MAY BE USED TO
ACCORDING TO CURRENT ASTM C-478 AND ACCORDING TO DETAILS SPECIFIED
CHANNEL FLOW IN THE BOTTOM OF MANHOLES PROVIDED THEY HAVE AT LEAST
ON THIS PLAN.
2" OF CONCRETE COVER.
PRECAST REINFORCED CONCRETE FLAT TOP SLAB SHALL BE
MARKED TO SHOW LOCATION OF REINFORCEMENT.
THE WALLS OF THE PRECAST
UNITS MAY HAVE A SLIGHT TAPER TO ALLOW FOR FORM REMOVAL.
PRECAST
CONCRETE 2'-0" DIAMETER DRAINAGE STRUCTURES SHALL HAVE A MINIMUM
3" WALL THICKNESS WITH A 6" MINIMUM BEARING SURFACE ON TOP.
THE USE OF THIS MATERIAL FOR CHANNEL FLOW
IS RESTRICTED TO MANHOLES WHERE THE BOTTOM SECTION IS NOT SUBJECT
TO FREEZING.
THE USE OF THIS MATERIAL MUST BE APPROVED BY THE
ENGINEER.
SEE
PRECAST RISER RING FOR 2'-0" DIAMETER STRUCTURE.
THE INSIDE DIAMETER OF PIPES ENTERING OR LEAVING PRECAST DRAINAGE
STRUCTURES SHALL BE LESS THAN THE INSIDE DIAMETER OF THE DRAINAGE
STRUCTURE MINUS 2'-0".
A PIPE LEAVING A 2'-0" DIAMETER DRAINAGE
STRUCTURE IS ALLOWED TO HAVE 1'-0" INSIDE DIAMETER OR LESS.
MICHIGAN DEPARTMENT OF TRANSPORTATION
MICHIGAN DEPARTMENT OF TRANSPORTATION
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
BUREAU OF HIGHWAY DEVELOPMENT STANDARD PLAN FOR
DRAINAGE STRUCTURES
SHEET
F.H.W.A. APPROVAL
PLAN DATE
AS-LET PLAN REVISIONS
0
NO.
DATE
AUTH
DESCRIPTION
NO.
DATE
AUTH
6-11-2015
OF
F.H.W.A. APPROVAL
DATE:
VERT. (FT)
DESCRIPTION
CS:
DESIGN UNIT:
Michigan Department of Transportation
0
HORZ. (FT)
FILE:
TSC:
JN:
PLAN DATE
SHEET
R-1-G
9
OF
9
DRAWING
SHEET