Source conditions
Map slopes, soils, existing vegetation, disturbed areas, stockpiles and likely work fronts. The risk changes as excavation, filling, trenching and access routes move through the programme.
NSW construction-site planning guide
Erosion and Sediment Control for NSW Construction Sites
Land disturbance changes how water moves across a site. A useful erosion and sediment control brief identifies the risks, control sequence, inspection responsibilities and evidence needed before work starts—not just a list of devices.
Erosion control and sediment control are different
Erosion control reduces the detachment and movement of soil at its source. Sediment control captures soil that has already been mobilised before it leaves the work area. Effective site planning uses both, with priority given to limiting disturbance and stabilising exposed areas.
Water pathways
Identify upstream clean-water catchments, low points, drainage lines, pits, culverts, site discharge points and receiving environments. Avoid directing clean water through disturbed ground where practicable.
Site constraints
Record boundaries, adjoining properties, public roads, utilities, access, available treatment area, sensitive receptors and the space needed to inspect and maintain controls safely.
Responsibility and hold points
State who prepares and approves the plan, installs controls, inspects them, responds to weather, authorises changes and retains records. Responsibilities depend on the project and contract.
A practical control hierarchy
- 1. PlanConfirm scope, approvals, staging, drainage and receiving environments.
- 2. MinimiseLimit clearing and open only the work area needed for the next stage.
- 3. DivertKeep clean water separate from disturbed areas where the design allows.
- 4. StabiliseProtect entrances, stockpiles, batters and completed surfaces promptly.
- 5. CaptureCollect and treat sediment-laden runoff using controls sized for the site.
Controls must remain workable: installation is only the first step. Access for inspection, sediment removal, repair and adjustment should be planned before the control is placed.
Inputs for an erosion and sediment control brief
- Approved drawings, conditions and environmental requirements
- Survey, contours, catchments and discharge points
- Soil type, dispersive-soil risk and geotechnical information
- Construction sequence and maximum disturbed area
- Temporary and permanent drainage interfaces
- Stockpile, waste, concrete-washout and material locations
- Stabilised access and public-road protection
- Control types, locations, capacities and installation details
- Weather monitoring and rainfall-response triggers
- Inspection frequency, responsibility and records
- Maintenance, sediment removal and disposal process
- Progressive stabilisation and final decommissioning sequence
The brief should be coordinated with the earthworks, drainage, haulage and access programme. For suitable construction packages, review SCE’s bulk earthworks pathway; the accepted scope determines what SCE delivers and which designers, environmental specialists, certifiers or authorities remain separately responsible.
Inspection, weather readiness and change control
Routine inspection
Check whether controls remain correctly located, stable, connected and accessible. Look for undercutting, overtopping, bypass flow, accumulated sediment, damaged stabilisation and tracking onto roads.
Before forecast rain
Review available capacity, exposed areas, stockpiles, drains, diversion paths, inlets and discharge points. Confirm response resources and escalation responsibilities are available.
After rainfall or site change
Inspect performance and record what occurred. Repair or adjust controls before the next risk period, and review whether changed staging, levels or drainage paths have made the plan inaccurate.
Evidence and handover
Keep the current plan, inspection records, photographs where useful, maintenance actions, removed-sediment records and approved changes. Retain the project-specific evidence required by the contract and authorities.
Use current NSW requirements and project documents
The NSW Government publication Managing Urban Stormwater: Soils and Construction, Volume 1, commonly known as the Blue Book, provides guidance for reducing erosion and sediment impacts from land disturbance. The NSW EPA stormwater guidance also explains the importance of keeping sediment and other pollutants out of stormwater.
These resources do not replace a project’s consent conditions, environmental management plan, approved drawings, specifications, licence conditions or authority directions. The appointed project team should identify the documents that govern the specific site and resolve any conflict before construction proceeds.
Responsibility boundary: SCE can review suitable civil construction packages and coordinate agreed construction interfaces. Design, environmental assessment, approvals, certification and statutory decisions remain with the appropriately appointed practitioners and authorities.
Frequently asked questions
What is the difference between erosion control and sediment control?
Erosion control reduces soil detachment and movement at the source. Sediment control captures mobilised soil before it leaves the work area. A site plan normally needs both, with priority given to minimising disturbance and stabilising exposed soil.
When should erosion and sediment controls be installed?
Required controls should be in place before the relevant land disturbance begins and adjusted as staging changes. The approved project documents determine the exact sequence, hold points and responsibilities.
What information is needed to prepare a site-specific plan?
Useful inputs include survey and catchments, soils, drainage paths, discharge points, work staging, stockpiles, access, sensitive receptors, approval conditions, inspection requirements and the people responsible for actions.
How often should construction-site controls be inspected?
The frequency must follow the project documents and applicable requirements. Inspections should also respond to forecast weather, rainfall, damage, significant site changes and any sign that a control is not performing as intended.
Why should clean water be separated from disturbed areas?
Where the design allows, separation can reduce the volume of runoff that contacts exposed soil and lower the load on sediment controls. Diversions must be planned so they do not transfer risk to another area.
Who is responsible for the erosion and sediment control plan?
Responsibility depends on the consent, contract, environmental documents and project appointments. The plan should clearly identify who prepares, approves, installs, inspects, maintains and changes each control.
What should be retained as closeout evidence?
Retain the current approved plan and applicable inspection, maintenance, weather-response, change and decommissioning records required by the contract and authorities. Project-specific requirements may call for additional evidence.
Bring the site information into one coordinated scope
Provide the location, proposed civil works, drawings, site constraints, staging and applicable environmental documents. SCE can review whether the package suits its construction capability and identify the information needed for the next step.