Stormwater Management

PCSWM2017A

 

Stormwater Management 

 

Use 

Precast stormwater management structures are typically used for storm water control 

ponds, detention, retention, energy dissipation, underground drainage and spring water 

control. 

 

Sizes 

Precast stormwater management structures are available in all pipe sizes, box sizes and 

manhole sizes. 

 

Application  

  Precast stormwater management structures may be used for the following: 

● Pond risers 

● Overflow structures 

● Underground deten on or reten on 

● An  seep collars 

● Energy dissipaters 

● Spring boxes 

● Infiltra on systems 

 

Joints 

The following joints may be available for utility structures: 

● Rubber gaskets 

● Pre‐formed mastic or butyl 

● Mortar joints 

 

Applicable Specifications 

The following specifications apply to Precast stormwater management structures: 

● ASTM C 76 

● ASTM C443 

● ASTM C361 

● ASTM C478 

● ASTM C877 

● ASTM C890 

● ASTM C913 

● ASTM C990 

● ASTM C1577 

● Department of Transporta on specifica ons 

● Local u lity jurisdic on requirements 

TITLE

01-25-17

DATE

Precast SWM Pond Riser

Stormwater Management

20170125TED03

Notes

1) Manhole structures conform to ASTM C478.

Isometric View

Outlet Pipe Opening

As Required

Wall Trash Rack

As Required

Top Trash Rack

As Required

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Steps

As Required

SECTION A-A

A A

TITLE

01-12-17

DATE

Precast SWM-1 Stormwater Management

Structure

Stormwater Management

20170113TED04

Plan View

Isometric View

Notes

1) Manhole sections conform to ASTM C478.

H

I.D.

As Required

Wall

Debris Rack

Metal Plate

Fill with

Class A1 Riprap 8''

3'-0''

8'' Ø

Water Quality

Orfice

Bottom of Stormwater

Management Basin

Trash Rack

Steps

If Required

Pipe

As Required

SECTION A-A

A A

TITLE

01-06-17

DATE

Precast Anti-Vortex Device (Cap & Riser)

Stormwater Management

20170113TED04

Plan View

Isometric View

6'' Ø Vent Typ

Notes

1) Precast Anti-Vortex device (Cap & Riser)

conform to ASTM C478.

2) Dimensions subject to permissible variations

of ASTM C478.

3) Inlet area (area between device I.D. and

riser O.D) is greater than outlet area

(area of riser I.D.).

Isometric View

Optional Frame & Grate

6" Ø Vent

Typ

Standard Dimensions

Riser ID Riser OD

Cap ID Cap OD

Notch Dia

Appr Cap wt (tons)

24'' 30'' 48'' 58'' 34'' 1.49

27'' 33

1

2

'' 60'' 72'' 37

1

2

'' 2.28

30'' 37'' 60'' 72'' 41'' 2.26

36'' 44'' 60'' 72'' 48'' 2.22

42'' 51'' 72'' 86'' 55'' 3.16

48'' 58'' 84'' 100'' 62'' 4.27

54'' 66

1

2

'' 84'' 100'' 70

1

2

'' 4.20

60'' 72'' 96'' 114'' 76'' 5.48

66'' 80

1

2

'' 96'' 114'' 84

1

2

'' 5.39

72'' 86'' 108'' 128'' 90'' 6.83

78'' 94

1

2

'' 126'' 147'' 98

1

2

'' 8.97

84'' 100'' 126'' 147'' 104'' 8.90

90° Typ

Inlet Area

30° Typ

Cap Support

Cap (O.D.)

Cap (I.D.)

Hotch Ø

24''

13''

2''

12''

8''

Riser (I.D.)

Riser (O.D.)

Optional 30'' x 30''

Frame & Grate

instead of 6'' Ø vent

 

Stormwater Management 

  

Open Top Riser vs. Anti‐Vortex Flow Rate Chart 

TITLE

01-25-17

DATE

Precast SWM Weir Wall

Stormwater Management

20170125TED01

Notes

1) Weir wall could have orifice openings and/or wier slot along center top.

Isometric View

Orifice Opening

As Required

Weir Slot

As Required

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TITLE

01-25-17

DATE

Precast SWM Level Spreader

Stormwater Management

20170126TED01

Notes

1) Level spreader will be uniform elevation along top to allow a sheet flow of water over it.

Isometric View

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SECTION A-A

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TITLE

01-17-17

DATE

Precast Energy Dissipator

(EG-1 & EG-1A)

Stormwater Management

20170119TED01

Notes

1) Refer to VDOT Road & Bridge Standards for EG-1A grate detail.

2) EG-1 PC Energy Dissipator (without grate).

3) EG-1A PC Energy Dissipator (with grate).

Isometric View

Elevation View

Plan View

3'-0''6'' 6''

6''

4'-6''

1'-0''1'-0''1'-0''

2 1/2 ''2 1/2''

7''

6''

12''

2'-6''2'-3''

6''

6''

3'-4 3/4''

6 1/4''

Paved ditch connected

to EG-1 in field

SECTION A-A

A A

TITLE

01-05-17

DATE

Precast Anti-Seep Collar

Stormwater Management

20170112TED02

Elevation View

Isometric View

Notes

1) Contractor to seal pipe into opening in field.

6'' Min.

As Required

As Required

Pipe Opening

As Required

Round or Square

As Required

TITLE

01-17-17

DATE

Precast 48'' Ø Spring Box

with Solid Flattop

Stormwater Management

20170120TED01

Notes

1) Manhole components to be per ASTM C478.

2) Top 6'' thick for 0' to 20' fill over flattop and 10'' thick for 20' to 50' fill over flattop.

3) Bottom 8'' thick for 0' to 20' fill over flattop and 10'' thick for 20' to 50' fill over flattop.

Isometric View

(

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(

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30'' Ø (Shown)

or 30'' x 30'' Square Opg

in Floor

Flexible pipe Connector

for 12'' Ø DI Pipe

2

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4

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5

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48'' (I.D.)

4'-10'' (O.D.)

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