← bridge ontologyBridge Asset › Drainage and Protection System

Subsurface Drain

bridge.drainage_protection_system.subsurface_drain

publishedEdit

Definition

Perforated drain collecting subsurface water.

Class kind: component
Abstract: no
Depth: 2
Origin: reference source
Ontology: engineering-reference-book.bridge v1.0.0
Aliases: Subsoil Drain, Filter Drain
Abbreviations: —
Last changed: 7/27/2026, 2:50:05 PM

Identification

Positive labels: Subsurface Drain, Subsoil Drain, Filter Drain
Negative labels: —
Visual features: drainage symbol or channel/pipe geometry
Min identity clues: 2

Evidence

Preferred views: plan, section, detail, drainage_schedule
Evidence types: view, detail, schedule, note, dimension, level, section_callout
Source trace required: yes

Measurements (3)

Name	Symbol	Unit	Required
Length	`L`	m/mm	required
Drain Diameter	`D_drain`	mm	required
Material Type	`MAT`	—	required

Relationships (2)

drainsbridge.superstructure
discharges_tobridge.drainage_protection_system

BOQ items (1)

Item code	Formula	Result	Unit
`bridge.drainage.subsurface_drain.quantity`	`L`	length	m

Validation

Blocking if missing: yes
Human review allowed: yes

no_evidence_no_number
retain_document_page_bbox_and_evidence_id
do_not_mix_drawing_revisions
do_not_average_conflicting_values
prefer_explicit_labels_over_shape_only
match_plan_elevation_and_section_when_applicable

Provenance

Basis: engineering_reference
Project values included: no

Children (0)

None — this is a leaf class and can be deleted.