Site drainage
📅
-8 weeks
Updated:
Site drainage is a crucial aspect of construction site planning to manage stormwater runoff and prevent issues such as flooding, erosion, and environmental pollution.
Drainage systems can act as rapid pathways for the spread of pollutants. Small quantities of pollutants such as oil can spread over large areas and cause significant harm.
Both storm and foul drainage systems must be identified and shown on plans. It is good practice to colour code drain covers:
Surface Water: Blue
Foul Water: Red
Combined: Red
The site establishment team must:
- Ensure any water management mitigation measures and strategies identified at preconstruction stage are implemented.
- Conduct a site assessment to understand the topography, soil composition, and existing drainage patterns. Identify low points where water may accumulate and areas prone to erosion.
- Develop a drainage plan to address surface water runoff, consider the slope of the land, and incorporate measures to control erosion.
- Review any potential impact on existing drainage systems if occupying established premises and deploy suitable control measures.
- Install erosion control measures to prevent soil erosion during construction. This may include silt fences, and other sediment control methods.
- Design the site to divert surface water away from critical areas or sensitive receptors.
- Integrate stormwater management features, such as retention ponds, to control and treat stormwater runoff. These features help reduce the impact on downstream areas and improve water quality.
- Wherever possible, use permeable surfaces like permeable pavers or porous asphalt to allow water to infiltrate into the ground rather than running off.
- Install drainage pipes and culverts to channel water away from the construction site. Proper sizing and placement are critical to ensure effective drainage.
- Undertake baseline testing of existing drainage systems near sensitive water receptors.
- Explore sustainable drainage solutions.
- Regularly inspect the drainage system to ensure it is functioning properly and perform maintenance and sampling as required.
- Develop an emergency response plan for extreme weather events or heavy rainfall.
- Ensure that the drainage system can handle increased water flow during such conditions.
- Where there is significant risk of surface water runoff engage with a hydrologist to assist with mapping water runoff.
The site establishment team should consider:
- Installing hazardous substance (fuel) interceptors, e.g. witches hat drain guard or EnviroHorn DropFit.
Contact
| Business Unit Environmental team |
| Business Unit Engineering and Design team |
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