ENHANCED INFILTRATION
Enhanced Infiltration
Accelerating climate change is causing more frequent and devastating storm events causing floods, landslides, erosion and river pollution, alongside extended periods of drought, soil desiccation and wildfire events.
Infiltrating the ground with water captured during storm events helps mitigate the negative consequences of climate change.
OGI produces drainage system designs to enhance the natural infiltration of stormwater back into the ground, from initial feasibility through to detailed design and construction.
Our Enhanced Infiltration Services
Infiltration Feasibility Assessment
Testing Specifications
Site Presence
Permeability Interpretation
Detailed Infiltration System Design
Regulatory and Planning Support
Stormwater Attenuation and Enhanced Infiltration System (SAEIS)
Enhanced infiltration systems, that combine vertical infiltrators with soakaways, infiltration basins, infiltration trenches, and permeable pavement sub-bases, depend on a robust understanding of ground permeability, groundwater levels, and the geological setting beneath the proposed system.
To aid in mitigating many of the societal and natural challenges caused by more frequent storm events, OGI has invested knowledge, skill and experience to develop the System SAEIS.
Stormwater Attenuation and Enhanced Infiltration System.
SAEIS
Captured water is attenuated in long horizontal chambers below the ground surface, reducing storm water runoff downstream in a storm event.
After a storm event, the attenuation system integrated with vertical infiltrators, results in an enhanced infiltration system. Attenuated water is then slowly released back to the natural groundwater regime, regenerating our groundwater resources.
What We Do
OGI provides an enhanced infiltration service, from initial feasibility through to detailed design and construction.
We review available ground investigation data, published geological and hydrogeological settings of the site, to identify the testing and assessment work required to develop a detailed design. Where suitable data are not available, OGI specifies and supervises the in-situ infiltration testing required to characterise the ground.
Early engagement is essential. Infiltration testing is most usefully undertaken alongside the wider site investigation, and the results inform drainage strategy, planning submission, and detailed design of the infiltration system. OGI identifies required testing and assessment work at the earliest possible project stage, so that infiltration design is supported by appropriate evidence.
Our Approach
OGI’s approach is for every design to be tailored to the site, and flag clearly where available data does not support the proposed system. This is so alternative drainage strategies can be considered before construction commences.
Where infiltration is being considered in combination with attenuation, controlled discharge, or rainwater harvesting, OGI coordinates the hydrogeological evidence and design across all elements so that the overall drainage strategy is internally consistent and defensible to the relevant reviewing authority.
Key Outputs
Infiltration Feasibility Report
A comprehensive yet concise assessment evaluating the suitability of the site for infiltration based drainage, drawing upon published information and site specific data, with a clear recommendation on viability and further testing requirements.
Infiltration Design Report
A comprehensive design report, structured and presented in a form suitable for inclusion within the drainage strategy and planning submission.
