Shapes, Sizes and Uses of Corrugated Conduits

Shapes and uses of corrugated conduits
Shape Range of Sizes Common Uses
Round round.png 6 in. -51 ft Culverts, subdrains, sewers, service
tunnels, etc. All plates same radius.
For medium and high fill (or trenches)
Vertical ellipse
5% nominal
eclipse.png 4-21 ft
nominal;before elongating
Culverts, sewers, service tunnels,
recovery tunnels. Plates of varying
radii;shop favbrication. For
appearance and hwhere backfill
compaction is only moderate.
Pipe Arch pipearch.png Span x Rise 17 in, x 13 in.
20ft 7 in x
13 ft 2 in.
Where headroom is limited, Has
hydraulic advantages at low flows.
Corner plate radius. 18 inches or
31 inches for structural plate.
Underpass* underpass.png Span x Rise
5ft 8 in, x 5 ft 9 in.
20 ft 4 in. x 17 ft 9 in.
For pedestrians, livestock or
vehicles (structural plate).
Arch arch.png Span x Rise
5 ft x 1 ft 9 1/2 in.
82 ft x 42 ft
For low clearance large waterwway
openinng, and aesthetics (structural plate).
Horizontal Ellipse Horiz.png Span
7-40 ft
Culverts, grade separations, sorm
sewers, tunnels (structural plate).
Pear pear.png Span
25-30 ft
Grade separations, culverts, storm
sewer, tunnels (structural plate).
High Profile
highProf.png Span
25-83 ft
Culverts, grade separations, storm
sewers and tunnels. Ammunition
magazines, earth covered storage
(structural plate).
Low Profile
lowProf.png Span
20-83 ft
Low-wide waterway enclosures,
culverts, storm sewers (structural plate).
Box Culvert box.png Span
10-53 ft
Low-wide waterway enclosures,
culverts, storm sewers (structural plate).
Specials Various For lining old structures or other
spcial puposes. Special fabrication.
*For equal area or clearance, the round shape is generally more economical and easier to assemble.

For additional information, see the CSP Design Manual Page 25.

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