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Delaware's precast concrete drainage work on state projects is governed by the Delaware Department of Transportation (DelDOT). The requirements for drainage structures, reinforced concrete pipe, box culverts, and the concrete itself live in the Standard Specifications for Road and Bridge Construction, with details carried on the state's standard drawings. Precast producers read those documents alongside the project plan set to know what to make and how it will be accepted.
DelDOT drainage quantities and structure types ride on the project plan sheets, commonly in schedule tables that itemize inlets, manholes, and pipe runs with sizes and pay items rather than on a single standalone sheet. For new construction, precast structures are used unless the contract directs otherwise, with cast-in-place where new work ties into existing pipes and structures. Inlet, manhole, and pipe details draw from Standard Construction Details Section III and Standard Specifications Sections 601 and 602.
Standard Specifications for Road and Bridge Construction, 2026 (published as a living wiki; the applicable edition tracks each contract's advertisement date). The sections below cover precast drainage structures, pipe, culverts, and concrete.
| Section | Title |
|---|---|
| 601 | Pipe Culverts |
| 602 | Drainage Structures |
| 610 | Concrete Structures |
| 612 | Precast Concrete |
Section numbers are a reference. Confirm them against the current specification and any special provisions for your project.
Section III (Drainage) carries the precast sheets: D-4 Inlet Box, D-5 Drainage Inlet Details (frames, grates, top units, cover slabs), and D-6 Manhole Details (box and round assemblies, grade rings, cover slabs). D-8 covers pipe bedding and flared end support. Box culverts, three-sided structures, and headwalls appear by project design rather than a standard detail.
The Approved Product Lists carry a dedicated Precast Concrete category with its own acceptance program, alongside Ready-Mix Portland Cement Concrete and related concrete categories. Producers seeking addition contact the Materials and Research section.
Plant certification: Precast Concrete Acceptance Program (DelDOT Materials and Research). NPCA plant certification plus DelDOT inspection and approval.
DelDOT drainage quantities and structure types ride on the project plan sheets, commonly in schedule tables that itemize inlets, manholes, and pipe runs with sizes and pay items rather than on a single standalone sheet. For new construction, precast structures are used unless the contract directs otherwise, with cast-in-place where new work ties into existing pipes and structures. Inlet, manhole, and pipe details draw from Standard Construction Details Section III and Standard Specifications Sections 601 and 602.
DhyanaERP reads DelDOT drainage summaries today.
DhyanaERP Drainage Summary Import reads a plan set, finds the drainage structure sheets, transcribes them under a strict extraction contract, checks the engineering, and turns each row a person confirms into a priced structure. This status describes DhyanaERP's reading capability only. It is not a statement of DOT approval.
See DhyanaERP Precast EditionSection 602 (Drainage Structures) covers inlets, catch basins, manholes, and junction boxes; Section 601 (Pipe Culverts) covers pipe and connections; Section 612 (Precast Concrete) and Section 610 (Concrete Structures) govern the precast concrete itself. Precast round manhole riser sections follow AASHTO M 199.
For new construction, precast structures are used unless the contract says otherwise. Cast-in-place applies where work ties into existing pipes and structures, and a contractor may request precast there subject to the engineer's approval.
Yes. DelDOT maintains a Precast Concrete category on its Approved Product Lists through the Materials and Research section, with its own acceptance program. Producers seeking addition contact that section; confirm current plant qualification requirements before bidding.
Standard Construction Details Section III (Drainage): D-4 Inlet Box, D-5 Drainage Inlet Details, D-6 Manhole Details, and D-8 Pipe Bedding and Flared End Support. Project plan sheets then schedule the specific sizes and pay items.
Every link points to the agency's own site.
DhyanaTech is not affiliated with or endorsed by any state DOT.
Reference only. Not engineering or legal advice. Always confirm against the current specifications and the contract documents for your project.
Last verified November 2026.