FDOT Standard Plans · FY 2026-27 · Series 425: Structures
FDOT Standard Plans Index 425-030: Barrier Inlets
Short answer
Index 425-030 is the FDOT Standard Plan for Barrier Inlets, part of Series 425 (Structures). The sections below are extracted from FDOT's Standard Plans Instructions (SPI) for this index — design criteria, assumptions and limitations, and what your plans must show.
Design Criteria
Design Criteria and Guidance FDOT Design Manual (FDM) ; Drainage Manual (DM) ; Drainage Design Guide (DDG)
Design Assumptions and Limitations
Design Assumptions and Limitations Median Barrier Inlet is not suitable for use in pedestrian traffic or bicycle way. Adjacent Barrier Inlets are suitable for bicycle and occasional pedestrian traffic when roller bars (Index 425-031 Detail A, Sheet 2) are installed. Do not place inlets in a designated pedestrian travel way.
Design Adjacent Barrier Inlets with minimum depths when located in embankments constructed with earth anchored retaining wall. This is to reduce adverse impacts on the anchorage system. Avoid runs of pipe parallel to and near anchored walls where practical.
Coordinate with Drainage and Design during design and construction of storm water systems within anchored wall systems. Grates for Curb and Gutter Barrier Inlets have extended crossbars or bar stubs, and are suitable for use in areas of bicycle traffic. Recommended maximum pipe sizes for Curb and Gutter Inlets pipe connections to inlet structure bottoms are 18” longitudinal and 30” transverse.
Use Alternate B bottoms, Index 425-010, for larger pipe.
Payment
Payment Item number Item Description Unit Measure 425-1-AAB Inlet - Drainage EA See the BOE and Specification 425 for additional information on payment, pay item use and compensation.
What your plans must show
Plan Content Requirements for this index — the SPI's checklist for designers.
- Include Drainage Structure information in the Plans in accordance with the requirements of the Basis of Estimates Manual ( BOE ) and the FDM. Specify reticuline grate for Median Barrier Inlets where bicycle traffic or occasional pedestrian traffic is anticipated. For Curb and Gutter Inlets pay item purposes, depth of the barrier inlet is computed using the center of box grate elevation minus either the flow line elevation of the lowest pipe flow line or the top of the sump floor elevation.
How PDFDepth uses this index
When a plan set cites Index 425-030, PDFDepth's AI Plan Review cross-references the set against the Plan Content Requirements for the FDOT indexes it cites and flags items that appear to be missing — each with a citation to the sheet. A human reviewer verifies every flag before it counts.
Related indexes in Series 425
- Index 425-001 — Manhole Covers, Frames, Tops, and Supplementary Inlet Details
- Index 425-010 — Structure Bottoms Type J and P
- Index 425-020 — Curb Inlets Types 1-10
- Index 425-021 — Curb Inlet Top Types 5 and 6
- Index 425-022 — Curb Inlet Type 7
- Index 425-023 — Curb Inlet Type 8
- Index 425-024 — Curb Inlet Type 9
- Index 425-025 — Curb Inlet Type 10
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Start for FreeText extracted from FDOT Standard Plans FY 2026-27, a public-domain Florida state publication. Always verify against the current edition at fdot.gov. PDFDepth is not affiliated with FDOT.