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Civil Drainage Dewatering and Water Infrastructure Risk Assessment

Civil Drainage Dewatering and Water Infrastructure Risk Assessment

  • • 100% Compliant with Australian WHS Acts & Regulations
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Civil Drainage Dewatering and Water Infrastructure Risk Assessment

Product Overview

Identify and control organisational risks associated with Civil Drainage Dewatering and Water Infrastructure through a structured, management-level WHS Risk Management framework. This Risk Assessment supports compliance with the WHS Act, demonstrates executive Due Diligence, and helps protect your business from operational and legal liability.

Risk Categories & Hazards Covered

This document assesses risks and outlines management controls for:

  • WHS Governance, Legal Compliance and PCBU Duties: Assessment of officer due diligence, PCBU obligations, consultation arrangements, and the integration of WHS into corporate governance for drainage and dewatering projects.
  • Design Risk Management for Drainage, Dewatering and Hydraulic Structures: Management of safety in design, constructability reviews, lifecycle considerations, and elimination or minimisation of risks at the planning and engineering design stage.
  • Project Planning, Staging and Interface Management: Assessment of how works are sequenced, coordinated and integrated with other contractors, stakeholders and live services to control concurrent activities and interface risks.
  • Ground Conditions, Excavation and Structural Stability Management: Management of geotechnical information, excavation support systems, trench stability, inundation risk and ground movement affecting adjacent structures and services.
  • Dewatering System Design, Operation and Monitoring: Protocols for pump and system selection, discharge pathways, monitoring regimes, alarms and contingency capacity to manage inflows, failures and environmental constraints.
  • Slurry Management, Sediment Control and Waste Handling: Assessment of sedimentation systems, filtration, bunding, spoil handling, and disposal controls to meet environmental and WHS obligations.
  • Utilities Identification, Isolation and Relocation Management: Management of dial-before-you-dig processes, service proving, isolation verification, and coordination of relocations to prevent service strikes and outages.
  • Confined Spaces, Sewer and Stormwater Access Systems: Protocols for confined space identification, permitting, atmospheric testing, rescue planning and hygiene management within pits, manholes and culverts.
  • Plant, Mobile Equipment and Traffic Interaction Systems: Assessment of plant selection, separation controls, traffic management plans, spotter arrangements and exclusion zones for work around excavators, trucks and cranes.
  • Waterways, River Diversions and Public Interface Controls: Management of diversion structures, flow control, bank stability, public access, community impact and environmental protection around open waterways and drainage corridors.
  • Health, Hygiene, Hazardous Substances and Biological Risk Management: Assessment of exposure to sewage, contaminated water, chemicals, noise, heat, and vector-borne or waterborne diseases, including appropriate PPE and health monitoring.
  • Competency, Training and Supervision for Hydraulic and Dewatering Works: Management of competency requirements, verification of qualifications, task-specific training and supervision levels for high-risk drainage and dewatering activities.
  • Documentation, Permits, Change Control and Communication Systems: Protocols for permits to work, method approvals, design changes, shift handovers, and communication pathways to maintain control over evolving site conditions.
  • Emergency Preparedness, Incident Response and Recovery: Assessment of site-specific emergency planning for inundation, collapse, contamination, plant incidents and public harm, including drills, resources and recovery strategies.

Who is this for?

This Risk Assessment is designed for Business Owners, Project Directors, Construction Managers and Safety Leaders responsible for planning, approving and overseeing Civil Drainage Dewatering and Water Infrastructure operations across their organisation.

Hazards & Risks Covered

Hazard Risk Description
1. WHS Governance, Legal Compliance and PCBU Duties
  • • Inadequate understanding of WHS Act 2011, WHS Regulations, and relevant Codes of Practice for civil construction and excavation
  • • Lack of clear WHS roles, responsibilities and accountability across client, principal contractor, subcontractors and designers
  • • Failure to consult, cooperate and coordinate activities between multiple PCBUs on shared civil drainage and water infrastructure worksites
  • • Insufficient WHS objectives, targets and performance indicators for drainage, dewatering and hydraulic works
  • • Inadequate resourcing (funding, personnel, time) allocated to implement and monitor WHS requirements
  • • Poor integration of WHS governance into broader project management and contract frameworks
  • • Failure to review and update WHS management arrangements when scope changes (e.g. river diversions, sewer realignments, stormwater upgrades)
2. Design Risk Management for Drainage, Dewatering and Hydraulic Structures
  • • Design of canal linings, culverts, stormwater drains and sewer mains that does not adequately consider constructability and WHS risks
  • • Omission of temporary works design for dewatering systems, cofferdams, shoring and river diversions
  • • Inadequate provision for safe access, egress and fall prevention in pits, culverts, manholes and open channels
  • • Failure to design out confined space entry where practicable in sewer mains, stormwater structures and chambers
  • • Insufficient allowance for inspection, maintenance and cleaning access to gratings, weirs, headwalls and hydraulic structures
  • • Design not accounting for hydraulic loads, scour, uplift and instability during construction dewatering phases
  • • Poor integration of relocated utilities into drainage and water infrastructure design leading to clashes and unsafe work sequences
3. Project Planning, Staging and Interface Management
  • • Poor staging of drainage system construction leading to uncontrolled water ingress and flooding of work areas
  • • Inadequate planning for simultaneous operations (e.g. excavation, utility relocation, liner placement and grate installation occurring in the same corridor)
  • • Lack of coordinated planning with road authorities, water utilities and other asset owners for tie-ins and shutdowns
  • • Insufficient assessment of upstream catchments, storm events and river flows during construction and dewatering
  • • Unplanned changes to construction methodology impacting dewatering, slurry management or river diversions without risk reassessment
  • • Inadequate planning for access, laydown areas and plant movements within narrow drainage corridors or canal alignments
  • • Failure to integrate temporary traffic management with drainage excavations, culvert installs and stormwater works
4. Ground Conditions, Excavation and Structural Stability Management
  • • Inadequate geotechnical investigation for trenches, pits, canals and culvert excavations
  • • Uncontrolled ground movement, trench wall collapse or instability of canal and river banks during lowering of groundwater
  • • Failure to consider uplifting pressures and flotation of pipes, culverts or linings due to groundwater or hydraulic loading
  • • Insufficient system for selecting, installing and inspecting trench support, shoring, battering and benching
  • • Lack of engineering controls for excavation near existing structures, utilities and roadways
  • • Inadequate monitoring for ground settlement or heave affecting adjacent assets during dewatering and slurry operations
  • • Poorly managed stockpiles or plant loads placed too close to excavations, culvert edges or lined canals
5. Dewatering System Design, Operation and Monitoring
  • • Inadequate capacity or redundancy in dewatering systems for trenches, shafts, canal works and culvert installations
  • • Uncontrolled water inflows leading to rapid flooding of work areas and entrapment of workers or plant
  • • Instability of excavation or canal embankments due to excessive drawdown or uneven dewatering
  • • Lack of systems to manage noise, vibration and diesel emissions from dewatering plant
  • • Insufficient monitoring of pump performance, discharge quality and water levels in wells, sumps and adjacent waterways
  • • Inadequate emergency response planning for pump failure, power outage or extreme rainfall during critical works
  • • Non-compliance with environmental approvals and discharge conditions for pumped water and slurry
6. Slurry Management, Sediment Control and Waste Handling
  • • Inadequate systems for managing drilling fluids, slurry and contaminated sediments from dewatering and trenching
  • • Uncontrolled release of slurry or turbid water into waterways, stormwater systems or public areas
  • • Failure to identify and manage contaminated soil, sewage-impacted materials and hazardous waste from sewer main works
  • • Insufficient containment capacity for slurry pits and tanks, leading to overtopping and ground contamination
  • • Poorly planned transport, tracking and disposal of liquid and solid wastes from canal lining, culvert installations and sewer replacements
  • • Lack of procedures for managing exposure to biological hazards (sewage, stagnant water) and chemical treatment additives
  • • Non-compliance with environmental licences and waste classification requirements
7. Utilities Identification, Isolation and Relocation Management
  • • Inaccurate or incomplete detection and mapping of underground services near culverts, drains, sewer mains and stormwater works
  • • Failure to adequately plan for and control work around live gas, electricity, water and telecommunications during drainage construction
  • • Uncoordinated utility relocation works causing unexpected service strikes or outages
  • • Lack of formal isolation and lockout systems when cutting in to existing sewer and water mains
  • • Service congestion in existing corridors leading to constrained and unsafe excavation or pipe laying
  • • Insufficient communication with utility owners regarding changes in alignment, depth or construction method impacting services
  • • Inadequate supervision and competency of personnel undertaking works near critical utilities
8. Confined Spaces, Sewer and Stormwater Access Systems
  • • Uncontrolled entry into confined spaces such as manholes, culverts, sewer mains, stormwater pipes and chambers
  • • Build-up of toxic or flammable gases in sewers and enclosed drainage structures
  • • Oxygen-deficient atmospheres in long pipes, culverts and sumps
  • • Inadequate entry permitting, atmospheric testing and standby arrangements for confined space works
  • • Lack of rescue capabilities and equipment for workers in deep pits, manholes and culverts
  • • Misclassification of certain structures (e.g. large box culverts) leading to inappropriate controls
  • • Fatigue and heat stress for workers in confined or poorly ventilated underground spaces
9. Plant, Mobile Equipment and Traffic Interaction Systems
  • • Uncontrolled interactions between mobile plant and workers during trenching, pipe laying, grate installation and canal construction
  • • Inadequate systems for selection, inspection and maintenance of specialised plant used in dewatering, lifting and pipe installation
  • • Poor traffic management around road crossings, culvert installations and stormwater connection points
  • • Failure to implement safe systems of work for cranage of pipes, culvert units, precast structures and canal lining materials
  • • Lack of controls for working near water with mobile plant (e.g. risk of rollover into canals, rivers or deep drains)
  • • Insufficient management of plant working on or near embankment edges, open channels and dewatered excavations
  • • Inadequate plant operator competency verification for complex hydraulic and dewatering operations
10. Waterways, River Diversions and Public Interface Controls
  • • Uncontrolled changes to river flow paths or canal diversions leading to erosion, bank collapse and flooding of downstream or adjacent areas
  • • Public access to or interference with open excavations, diversion channels, dewatering discharges and temporary structures
  • • Inadequate communication with stakeholders (residents, businesses, landowners) regarding changed water levels, access restrictions and construction activities
  • • Failure of temporary river diversion structures (bunds, cofferdams, bypass pipes) during high flow events
  • • Impact on recreational water users near construction zones in rivers, creeks or canals
  • • Non-compliance with approvals and licence conditions from water authorities, local councils and environmental regulators
  • • Inadequate emergency planning for overtopping, breach or failure of diversion works
11. Health, Hygiene, Hazardous Substances and Biological Risk Management
  • • Exposure to sewage, contaminated water and biohazards during sewer main replacement and stormwater works
  • • Inadequate management of hazardous substances used in canal lining, concrete works, coatings and water treatment (e.g. resins, admixtures, grouts)
  • • Poor hygiene facilities and practices for workers handling slurry, sewage-impacted materials and stagnant water
  • • Lack of health surveillance and vaccination for workers regularly exposed to biological contaminants
  • • Inadequate assessment of chemical compatibility and interactions between treatment agents, ground conditions and sewer/stormwater flows
  • • Insufficient systems for controlling dust, noise and vibration in populated areas along drainage corridors
  • • Failure to manage heat stress, UV exposure and fatigue in outdoor, water-adjacent work environments
12. Competency, Training and Supervision for Hydraulic and Dewatering Works
  • • Insufficient technical competency of supervisors and workers undertaking dewatering, canal lining and complex drainage construction
  • • Lack of understanding of excavation stability, confined space, hazardous substances and environmental obligations specific to water infrastructure projects
  • • Inadequate supervision ratios for high-risk activities such as deep trenching, sewer tie-ins and river diversions
  • • Poor induction processes for new workers and subcontractors joining the project mid-phase
  • • Failure to verify licences, tickets and competency for high-risk work and specialist plant operations
  • • Limited ongoing training and communication regarding changes to procedures, design or staging
  • • Language and literacy barriers affecting comprehension of WHS instructions and procedures on multi-cultural workforces
13. Documentation, Permits, Change Control and Communication Systems
  • • Work proceeding without approved plans, permits or engineering verifications for dewatering, excavations or confined spaces
  • • Use of superseded drawings or specifications for drainage and utility relocation works
  • • Informal change of construction method (e.g. from open cut to microtunnelling) without WHS review
  • • Inadequate communication of design changes, temporary works requirements or revised dewatering strategies to field teams
  • • Poor record keeping of inspections, test results and monitoring data for hydraulic and structural elements
  • • Lack of systematic handover of WHS information between shifts, contractors and project phases
  • • Permit processes that are overly complex or poorly understood, leading to workarounds and non-compliance
14. Emergency Preparedness, Incident Response and Recovery
  • • Delayed or ineffective response to flooding of excavations, culverts, canals or pits due to storm events or dewatering failure
  • • Inadequate rescue capabilities for workers in confined spaces, deep trenches or water-adjacent works
  • • Lack of coordinated response to service strikes, sewage spills or hazardous material releases
  • • Poor communication with emergency services and regulators during significant incidents (e.g. river diversion breach, sewer overflow)
  • • Insufficient drills and practice of site-specific emergency procedures for hydraulic and dewatering scenarios
  • • Inadequate recovery and business continuity planning following major incidents affecting drainage and water infrastructure projects
  • • Failure to learn from incidents and near misses, leading to recurrence of systemic issues

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Legislation & References

This document was researched and developed to align with:

  • Work Health and Safety Act 2011
  • Work Health and Safety Regulations 2017
  • AS/NZS ISO 31000:2018: Risk management — Guidelines
  • Safe Work Australia – Code of Practice: How to Manage Work Health and Safety Risks: Guidance on systematic risk management processes.
  • Safe Work Australia – Code of Practice: Excavation Work: Requirements and control measures for trenching and excavation activities.
  • Safe Work Australia – Code of Practice: Confined Spaces: Risk management principles for confined space entry and work.
  • Safe Work Australia – Code of Practice: Managing the Risk of Plant in the Workplace: Controls for selection, use and maintenance of plant and mobile equipment.
  • Safe Work Australia – Code of Practice: Hazardous Manual Tasks: Risk controls for manual handling associated with pipes, pumps and infrastructure components.
  • AS 2865: Confined spaces — Safety requirements for work in pits, manholes and similar structures.
  • AS/NZS 4801 / ISO 45001: Occupational health and safety management systems — Frameworks for integrating this Risk Assessment into organisational WHS systems.
  • AS 1940: The storage and handling of flammable and combustible liquids — Where fuels and chemicals are used in pumping and dewatering operations.
  • Relevant State/Territory Environmental Protection Guidelines: Requirements for sediment control, discharge quality and protection of waterways.
Standard Risk Assessment Features (Click to Expand)
  • Comprehensive hazard identification for all activities
  • Risk rating matrix with likelihood and consequence analysis
  • Existing control measures evaluation
  • Residual risk assessment after controls
  • Hierarchy of controls recommendations
  • Action priority rankings
  • Review and monitoring requirements
  • Consultation and communication records
  • Legal compliance references
  • Sign-off and approval sections

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Safe Work Australia Aligned