CULVERTS - Level 1 - Visual Inspection Report

• Road Name

• Road Chainage Location

• Inspection Location (Drop Pin)
  Address

• Inspection Date

  Date

• Inspected By

• Culvert Type

  Select Box Circular Elliptical Low Profile Pipe Arch (small) High Profile Pipe Arch (large) Other

  • Box
  • Circular
  • Elliptical
  • Low Profile Pipe Arch (small)
  • High Profile Pipe Arch (large)
  • Other

• Diameter (m)

• Height (m) x Span (m)

• Height (m) x Span (m)

• Height (m) x Span (m)

• Height (m) x Span (m)

• Height (m) x Span (m) or Diameter (m)

• Culvert Material

  Select Concrete Corrugated Metal Structural Steel Plate Plastic (HDPE or PVC) FibreGlass Other

  • Concrete
  • Corrugated Metal
  • Structural Steel Plate
  • Plastic (HDPE or PVC)
  • FibreGlass
  • Other

• No. of Barrels or Cells

• Approximate Culvert Length (m)

• Visible Skew

  Select Yes No N/A

  • Yes
  • No
  • N/A

• Skew Angle (Across Road)

  Select 45 deg 90 deg Other

  • 45 deg
  • 90 deg
  • Other

• Flow Direction (Relevant to Road Chainage Direction)

  LHS -> RHS

  RHS -> LHS

• Road Width (m)

• Road Crest Length over Culvert Structure (m)

• Road Surface Type

  Bitumen Sealed

  Asphalt

  Concrete

  Unsealed

• Height of Road Embankment above Top of Culvert (m)

• Surrounding environment conditions (1= Non-aggressive (dry) to 5= Most aggressive (creek / tidal)

• General Comments

• Roadway / Site Photos

  Media

• Outlet Channel Type

  Trapezoidal Channel

  Rectangular Channel

  Triangular Channel

  Irregular Channel

  Other

• Outlet Channel Bottom Width (m)

• Outlet Longitudinal Channel Slope

  Select Flat (less than 1% grade) Moderate (1% grade to 5% grade) Steep (above 5% grade)

  • Flat (less than 1% grade)
  • Moderate (1% grade to 5% grade)
  • Steep (above 5% grade)

• Outlet Channel Condition

  Select Clean and Clear of Debris / Vegetation Some Debris and Vegetation Blocked with Debris and Vegetation

  • Clean and Clear of Debris / Vegetation
  • Some Debris and Vegetation
  • Blocked with Debris and Vegetation

• General Comments

• Photos

  Media

• Condition State - Severity Level Rating Descriptions

• 1= The item is in excellent condition. No deficiencies.

• 2= The item is in good condition. No noteworthy deficiencies that affect the condition of the culvert. Insignificant damage and defects only with negligible misalignment. No work required.

• 3= The item is in fair condition but requires attention before the next inspection. All primary structural components are functional and fit for purpose but may have minor section loss, cracking, spalling or scour. Moderate deterioration or disintegration and minor settlement or misalignment.

• 4= The item is in poor condition and requires attention in the next financial year. Without repairs there is potential for failure leading to a critical situation. Advanced section loss, deterioration, significant spalling or scour have affected primary structural components. Considerable settlement or misalignment.

• 5= The item is in critical, imminent failure condition and requires immediate attention. Major deterioration or section loss present in primary structural components affecting structural stability.

Culvert INLET - Hydraulic Condition

Culvert INLET - Scouring / Erosion of Channels

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair works Major repair works

  • No Repair Works
  • Minor Repair works
  • Major repair works

• General Comments

• Photos

  Media

Culvert INLET - Flow Blockages (debris / vegetation) of Channels

• Condition State - Severity Level

• Management Required

  Select No clearing of debris / vegetation required Minor clearing of debris /vegetation Major clearing of debris /vegetation

  • No clearing of debris / vegetation required
  • Minor clearing of debris /vegetation
  • Major clearing of debris /vegetation

• General Comments

• Photos

  Media

Culvert INLET - Pipe Condition / Sediment build up or blockages

• Condition State - Severity Level

• Management Required

  Select Good Structural Condition Fair Structural Condition Poor Structural Condition No cleaning of silt / debris Minor clearing of silt / debris Major clearing of silt / debris Full Blockage of Silt / Debris - Replacement

  • Good Structural Condition
  • Fair Structural Condition
  • Poor Structural Condition
  • No cleaning of silt / debris
  • Minor clearing of silt / debris
  • Major clearing of silt / debris
  • Full Blockage of Silt / Debris - Replacement

• General Comments

• Photos

  Media

Culvert INLET - Component Material Condition

INLET Headwalls

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair Works Full Replacement

  • No Repair Works
  • Minor Repair Works
  • Full Replacement

• General Comments

• Photos

  Media

INLET Wingwalls

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair Works Full Replacement

  • No Repair Works
  • Minor Repair Works
  • Full Replacement

• General Comments

• Photos

  Media

INLET Aprons

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair works Major repair works

  • No Repair Works
  • Minor Repair works
  • Major repair works

• General Comments

• Photos

  Media

Culvert OUTLET - Hydraulic Condition

Culvert OUTLET - Scouring / Erosion of Channels

• Condition State - Severity Level

• Management Required

  No Repair Works

  Minor Repair works

  Major repair works

• General Comments

• Photos

  Media

Culvert OUTLET - Flow Blockages (debris / vegetation) of Channels

• Condition State - Severity Level

• Management Required

  Select No clearing of debris / vegetation required Minor clearing of debris /vegetation Major clearing of debris /vegetation

  • No clearing of debris / vegetation required
  • Minor clearing of debris /vegetation
  • Major clearing of debris /vegetation

• General Comments

• Photos

  Media

Culvert OUTLET - Pipe Condition / Sediment build up or blockages

• Condition State - Severity Level

• Management Required

  Select Good Structural Condition Fair Structural Condition Poor Structural Condition No cleaning of silt / debris Minor clearing of silt / debris Major clearing of silt / debris Full Blockage of Silt / Debris - Replacement

  • Good Structural Condition
  • Fair Structural Condition
  • Poor Structural Condition
  • No cleaning of silt / debris
  • Minor clearing of silt / debris
  • Major clearing of silt / debris
  • Full Blockage of Silt / Debris - Replacement

• General Comments

• Photos

  Media

Culvert OUTLET - Component Material Condition

OUTLET Headwalls

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair Works Full Replacement

  • No Repair Works
  • Minor Repair Works
  • Full Replacement

• General Comments

• Photos

  Media

OUTLET Wingwalls

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair Works Full Replacement

  • No Repair Works
  • Minor Repair Works
  • Full Replacement

• General Comments

• Photos

  Media

OUTLET Aprons

• Construction Material

  Select None Rock Armour Stone piching / rock masonry Reno Rock Mattress Gabion Baskets Concrete cast insitu Concrete pre-cast Steel Other

  • None
  • Rock Armour
  • Stone piching / rock masonry
  • Reno Rock Mattress
  • Gabion Baskets
  • Concrete cast insitu
  • Concrete pre-cast
  • Steel
  • Other

• Condition State - Severity Level

• Management Required

  Select No Repair Works Minor Repair works Major repair works

  • No Repair Works
  • Minor Repair works
  • Major repair works

• General Comments

• Photos

  Media

• Culvert Vulnerability State - Rating Descriptions

• 1= NOT VULNERABLE - Culverts that are rated as not vulnerable in Samoa would be those constructed with robust materials capable of resisting tropical weather conditions. These would likely be located in less flood-prone areas and designed to withstand the intensity and volume of local rainfall without any significant maintenance issues.

• 2=SLIGHTLY VULNERABLE - Slightly vulnerable culverts may experience minor issues from typical rainy seasons. Occasional debris might block these culverts, requiring routine clearing. They may show minor signs of wear like small cracks or rust, but these issues do not significantly impact their functionality.

• 3= MODERATLEY VULNERABLE - Moderately vulnerable culverts are those that are susceptible to more frequent blockages from debris during storms, potentially leading to temporary water pooling and minor road flooding. The materials may degrade more quickly due to salty air and humidity, necessitating more regular maintenance and occasional repairs to ensure functionality.

• 4= HIGHLY VULNERABLE - Highly vulnerable culverts in Samoa could be those on roadways close to the coast where storm surges and sea-level rise pose significant risks. They would likely suffer from accelerated corrosion, frequent blockages, and potential structural failures due to strong currents and increased sediment transport. These issues can lead to road destabilization, requiring extensive repairs and possibly redesign to handle changing water flow patterns and sea levels.

• 5 = VERY VULNERABLE - Very vulnerable culverts would be those located in areas at high risk of severe weather events, such as cyclones, or in low-lying areas where sea-level rise and storm surges could lead to regular inundation. These culverts may fail completely during extreme events, leading to road closures and significant impacts on the transportation network. Continual exposure to saltwater and strong currents might make maintenance and repair impractical, necessitating a complete overhaul or rethinking of infrastructure strategies.

Exposure to Increased Flooding and Rainfall Intensity Vulnerability

• Increased Flooding and Rainfall Intensity: Samoa's location in the Pacific exposes it to frequent tropical storms and cyclones, which are expected to increase in intensity due to climate change. The increased rainfall can lead to higher water volumes that existing culverts might not be designed to handle, potentially causing overtopping or structural failure.

• How vulnerable is the culvert to the potential of flow overtopping the road?

  Select High Chance of Flow Overtopping Road Likely Chance of Flow Overtopping Roadway Unlikely Chance of Flow Overtopping Roadway

  • High Chance of Flow Overtopping Road
  • Likely Chance of Flow Overtopping Roadway
  • Unlikely Chance of Flow Overtopping Roadway

• If flow was to overtop the roadway would the pavement material be adequate enough to withstand overtopping flows on the road?

  Select High Resilience - Concrete Pavement Medium Resilience - Asphalt Pavement Low resilience - Bitumen Sealed Pavement Failure Likely - Unsealed Pavement

  • High Resilience - Concrete Pavement
  • Medium Resilience - Asphalt Pavement
  • Low resilience - Bitumen Sealed Pavement
  • Failure Likely - Unsealed Pavement

• If the road was required to be closed for an extended period would it cause significant effect to the road network (are alternative routes available)

  Select Alternative Route Available - Minimal Delays Alternative Route Available - Significant Delays No Alternative route Available - Extensive delays

  • Alternative Route Available - Minimal Delays
  • Alternative Route Available - Significant Delays
  • No Alternative route Available - Extensive delays

• Is there adequate space to add additional culvert cells to the existing structure to increase immunity?

  Select Yes - Adequate Space Available without need for extensive inlet/outlet channel works Yes - Adequate Space Available but will require extensive inlet/outlet channel works No- Will require extensive roadworks and channel works

  • Yes - Adequate Space Available without need for extensive inlet/outlet channel works
  • Yes - Adequate Space Available but will require extensive inlet/outlet channel works
  • No- Will require extensive roadworks and channel works

• Vulnerability Assessment of Culvert for Increased Flooding and Rainfall Intensity

  1= NOT VULNERABLE

  2= SLIGHTLY VULNERABLE

  3= MODERATELY VULNERABLE

  4= HIGHLY VULNERABLE

  5= VERY VULNERABLE

• General Comments

• Photos

  Media

Exposure to Increased Sediment and Debris Flow

• Stronger storms and more intense rainfall can increase the amount of sediment and debris washed into culverts. This buildup can obstruct water flow, leading to water backup and increased pressure on culvert structures, which may result in blockages or even structural damage.

• How vulnerable is the culvert to the potential of increased sediment and debris flow causing future blockage

  1= NOT VULNERABLE

  2= SLIGHTLY VULNERABLE

  3= MODERATELY VULNERABLE

  4= HIGHLY VULNERABLE

  5= VERY VULNERABLE

• General Comments

• Photos

  Media

Exposure to Corrosion from Saltwater

• Culverts, especially those near the coast, are vulnerable to corrosion due to increased exposure to saltwater from sea spray and storm surges. Corrosion can weaken the structural integrity of culverts, reducing their lifespan and effectiveness.

• How vulnerable is the culvert to Corrosion Potential

  1= NOT VULNERABLE

  2= SLIGHTLY VULNERABLE

  3= MODERATELY VULNERABLE

  4= HIGHLY VULNERABLE

  5= VERY VULNERABLE

• Where culvert is concrete, are there any areas of exposed reinforcement or evidence of corrosion

  Yes

  No

  N/A

• General Comments

• Photos

  Media

Exposure to Sea Level Rise and Storm Surges

• Rising sea levels and more powerful storm surges can exacerbate coastal flooding, especially affecting culverts near the coastline. This not only leads to more frequent inundation but also to saltwater corrosion, which can degrade the materials used in culvert construction.

• How vulnerable is the culvert to potential sea level rise or storm surge effects.

  1= NOT VULNERABLE

  2= SLIGHTLY VULNERABLE

  3= MODERATELY VULNERABLE

  4= HIGHLY VULNERABLE

  5= VERY VULNERABLE

• General Comments

• Photos

  Media

Guardrails and Fencing

• Does culvert have guardrail or fencing

  Yes

  No

  N/A

• Is the Guardrail or Fencing Intact and Properly Installed

  Yes

  No

  N/A

• Condition State - Severity Level

• Management Required

  No Repair Works

  Minor Repair works

  Major repair works

• General Comments

• Photos

  Media

Signage and Guideposts

• Does the Culvert have any Signage or Guideposts Installed

  Yes

  No

  N/A

• Is the Signage and Guideposts Intact and Properly Installed

  Yes

  No

  N/A

• Condition State - Severity Level

• Management Required

  No Repair Works

  Minor Repair works

  Major repair works

• General Comments

• Photos

  Media

• Have Issues been identified that require Immediate Emergency Rectification (i.e. An Immediate Public Safety Issue)

  Yes

  No

  N/A

• Details of Emergency Rectification Required

• Overall Assessment of the Culverts Condition State - Severity Level

• Monitoring Required

  3 monthly

  6 monthly

  12 monthly

  24 monthly

• General Comments

• Completed Signature

  Sign