Shapes, Sizes and Uses of Corrugated Conduits

This table presents the various shapes, geometries and the range of sizes of corrugated steel drainage products (pipe, pipe arch and plate).

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.