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Skip Navigation LinksHome > Topeka Products > Water > Conveyance > Water Inlets

Water Inlets 

A drainage inlet is designed to collect excess rain and storm water runoff from roofs, sidewalks, parking lots, and paved streets. Drainage inlets can be categorized as curb inlets, drop inlets, and area inlets depending on the application.

A standard drop type drainage inlet is a below ground rectangular box structure with a horizontal rectangular opening at ground level. A perforated or slotted metal grate is typically inset into the top of the Inlet at ground level to allow water to enter into the inlet structure. Grates are available for both traffic rated and non-traffic rated applications.

Curb inlets are typically located in-line with a road side or sidewalk curb and have an opening or throat that is constructed through the curb to allow water to pass into the inlet and drainage pipe system. The opening or throat may have grating, rods, or bars built in that prevent large items from entering the Inlet.

Oldcastle Precast drainage inlets are engineered and manufactured in a wide range of sizes to meet all state and local standards and are a fast, effective and cost-efficient way to save time and money on your next project.


Applications:

  • Storm water management
  • Roadways
  • Parks
  • Ditches
  • Pedestrian and multi-use paths

Download PDF

Images Product Name Materials Docs
27" ID Grate Inlet - Detail 2'-3" ID x Varies Concrete pdf
27" ID Grate Inlet - Isometric 2'-3" ID x Varies Concrete pdf
IIP Area Inlet Assembly - Detail 2'-3' x 3'-3" x Varies Concrete pdf
IIP Area Inlet Assembly - Isometric 2'-3' x 3'-3" x Varies Concrete pdf
IIP Area Inlet Grate - Detail 2'-3" x 3'-3" Steel pdf
IIP Area Inlet Grate - Isometric 2'-3" x 3'-3" Steel pdf
IIP Area Inlet Manhole Top Slab - Detail 48", 60", 72", & 96" Diameters x 6" or 8" Concrete pdf
IIP Area Inlet Manhole Top Slab - Isometric 48", 60", 72", & 96" Diameters x 6" or 8" Concrete pdf
IIP Area Inlet Manholes - Detail 48", 60", 72", & 96" Diameters x Varies Concrete pdf
IIP Area Inlet Manholes - Isometric 48", 60", 72", & 96" Diameters x Varies Concrete pdf
KDOT Ditch Inlet Type I - Detail 5'-9" x 4'-0" x Varies Concrete pdf
KDOT Ditch Inlet Type I - Isometric 5'-9" x 4'-0" x Varies Concrete pdf
KDOT Ditch Inlet Type II - Detail 8'-6" x 4'-0" x Varies Concrete pdf
KDOT Ditch Inlet Type II - Isometric 8'-6" x 4'-0" x Varies Concrete pdf
KDOT Gutter Inlet Standard No. 634 - Detail 3'-4" x 3'-4" x Varies Concrete pdf
KDOT Gutter Inlet Standard No. 634 - Iso 3'-4" x 3'-4" x Varies Concrete pdf
KDOT Inlet Manhole (Special) - Detail Standard Sizes in 1'-0" Increments L x W Concrete
KDOT Inlet Manhole (Special) - Isometric Standard Sizes in 1'-0" Increments L x W Concrete
Standard Drop Inlet - Detail Standard Sizes in 1'-0" Increments L x W Concrete pdf
Standard Drop Inlet - Isometric Standard Sizes in 1'-0" Increments L x W Concrete pdf

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