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California's precast concrete drainage work on state projects is governed by the California Department of Transportation (Caltrans). The requirements for drainage structures, reinforced concrete pipe, box culverts, and the concrete itself live in the Caltrans Standard Specifications, 2026, 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.
This page links the core Caltrans documents a precast producer or estimator uses: the standard specifications, standard drawings, approved products, and where bid plans are posted. We are still documenting how Caltrans presents drainage structures on plan sets.
Caltrans Standard Specifications, 2026. The sections below cover precast drainage structures, pipe, culverts, and concrete.
Section numbers are a reference. Confirm them against the current specification and any special provisions for your project.
The Caltrans Standard Plans serve as the standard drawings and include drainage details such as inlets, manholes, and pipe.
Includes a precast concrete cementitious based repair materials list and a drainage grated line drains list.
We are still documenting how Caltrans presents drainage structures on plan sets.
DhyanaERP has not built a Caltrans parser profile yet.
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 EditionEvery 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.