infrastructure-assessment

name: infrastructure-assessment version: "1.0" description: "Evaluates the condition of municipal infrastructure assets (pipes, bridges, culverts, manholes) using inspection data, age, material, and failure history. This skill should be used when an asset ID or location is available and the pipeline needs a condition_assessment.json with condition rating, remaining useful life estimate, and rehabilitation priority." source: "Ontario Provincial Standard Specifications (OPSS), CSA S6:19, MTO BIM, OSIM" authority: "Province of Ontario, Ministry of Transportation Ontario, Canadian Standards Association" data_as_of: "2026-03-08" pipeline_position: 1 pipeline_outputs: "condition_assessment.json" pipeline_downstream: "infrastructure-standards"

Infrastructure Assessment

Purpose

Produce a structured condition assessment for a municipal infrastructure asset. Evaluate physical condition indicators against applicable standards, estimate remaining useful life, and classify rehabilitation urgency. Do not design remediation here — only assess current state and flag deficiencies.

Keep this skill narrow:

• Collect and normalize inspection data
• Evaluate condition against applicable standards (OPSD, CSA S6, OSIM)
• Score condition and estimate remaining service life
• Flag critical deficiencies and safety concerns
• Hand off to infrastructure-standards for design-standard lookups if needed

Use when

• An infrastructure asset needs a condition assessment
• Inspection data, age, material type, or failure history is available
• The next step needs a condition_assessment.json

Do not use when

• The task is to design a new asset or select materials
• The task is to look up a specific standard requirement (use infrastructure-standards)
• The task is to produce a capital plan or budget estimate

Inputs

{
  "project_id": "uuid",
  "asset_type": "storm_sewer | sanitary_sewer | watermain | bridge | culvert | manhole | catchbasin",
  "asset_id": "municipal asset ID or null",
  "location": {
    "address": "123 Main St, Toronto ON",
    "coordinates": [43.6532, -79.3832],
    "road_name": "Main Street",
    "municipality": "Toronto"
  },
  "known_attributes": {
    "material": "concrete | PVC | HDPE | steel | cast_iron | ductile_iron | corrugated_steel_pipe",
    "diameter_mm": 600,
    "length_m": 120,
    "install_year": 1965,
    "depth_m": 3.0,
    "last_inspection_date": "2023-06-15",
    "inspection_type": "CCTV | visual | OSIM | load_test"
  },
  "inspection_data": {},
  "failure_history": []
}

Required fields:

• asset_type
• One of asset_id or location

Optional fields:

• known_attributes (improves assessment quality)
• inspection_data (raw inspection findings)
• failure_history (past breaks, collapses, or service disruptions)

Outputs

Produce exactly one artifact: condition_assessment.json.

{
  "project_id": "uuid",
  "asset_type": "storm_sewer",
  "asset_id": "municipal ID",
  "assessment_timestamp": "ISO datetime",
  "condition_rating": {
    "overall": 1,
    "structural": 2,
    "operational": 1,
    "scale": "1-5 (1=very good, 5=very poor)",
    "methodology": "PACP | OSIM | visual | estimated"
  },
  "remaining_useful_life_years": {
    "estimate": 15,
    "confidence": "high | medium | low",
    "basis": "age-based | condition-based | failure-rate"
  },
  "deficiencies": [
    {
      "deficiency_type": "structural_crack | joint_displacement | corrosion | scour | spalling | deformation | blockage | infiltration",
      "severity": "minor | moderate | severe | critical",
      "location_description": "At joint 3, 45m from upstream MH",
      "standard_reference": "OPSD 701.010",
      "requires_immediate_action": false
    }
  ],
  "rehabilitation_priority": "routine | planned | urgent | emergency",
  "material_condition": {
    "material": "concrete",
    "age_years": 61,
    "expected_service_life_years": 75,
    "corrosion_risk": "low | medium | high",
    "notes": ""
  },
  "hydraulic_adequacy": {
    "capacity_adequate": true,
    "basis": "design flow vs observed | Manning's calc | unknown"
  },
  "safety_flags": [],
  "facts": [],
  "inferences": [],
  "assumptions": [],
  "unknowns": [],
  "recommended_next_skill": "infrastructure-standards"
}

Reference Router

Load only the reference file relevant to the current assessment:

Workflow

1. Identify the asset and collect attributes

• Confirm asset type and location
• Gather material, age, diameter/span, depth, and installation year
• If asset_id is provided, look up municipal records
• If only location is provided, identify assets from spatial data

2. Review inspection data

For pipes (CCTV inspection):

• Apply PACP (Pipeline Assessment Certification Program) grading where available
• Grade structural defects: cracks, fractures, deformation, joint displacement, collapse
• Grade operational defects: roots, deposits, infiltration, exfiltration
• Note defect location by distance from upstream manhole

For bridges and culverts (OSIM inspection):

• Apply Ontario Structure Inspection Manual condition states (1-4)
• Evaluate: deck/top slab, soffit, walls/abutments, bearings, foundations, waterway adequacy
• Check for scour, spalling, reinforcement exposure, bearing failure

3. Evaluate material condition

Use age-based deterioration curves when inspection data is insufficient:

Adjust for:

• Soil conditions (corrosive soils reduce life by 20-40%)
• Traffic loading (heavy truck routes accelerate deterioration)
• Water chemistry (aggressive water reduces pipe life)
• Maintenance history (regular cleaning extends operational life)

4. Assess hydraulic adequacy

For pipes:

• Compare design capacity against current service demand
• Flag undersized infrastructure based on current IDF curves
• Note if upstream development has increased flows beyond design

For bridges:

• Check waterway adequacy for design flood
• Assess freeboard requirements

5. Rate overall condition

Apply a 1-5 condition rating:

6. Classify rehabilitation priority

7. Flag safety concerns

Always check for:

• Structural collapse risk (condition 5 structural)
• Sinkhole potential (pipe failure under roadway)
• Bridge load posting requirements (reduced load capacity)
• Environmental release risk (sanitary sewer failure near watercourse)
• Public safety hazards (exposed reinforcement, barrier failure)

Quality Bar

• Never assign condition rating 1-2 without supporting inspection data or known recent rehabilitation
• Age alone is insufficient for a rating worse than 3 — require deficiency evidence for ratings 4-5
• Always distinguish between facts (inspection results) and inferences (age-based estimates)
• Flag every assumption explicitly

Stop Conditions

Stop and return a partial artifact when:

• Asset type cannot be determined
• No inspection data and no installation date are available
• Location is ambiguous and multiple assets could match
• Inspection data format is unrecognizable

Reference Files

Read only the reference file relevant to the asset type being assessed.

External References