Site located indicated by the red boundary
Ensuring Effective Flood Management in line with SuDS
The experienced team here at Onn Point Civil Engineering was commissioned to conduct a flood risk assessment for a proposed hand car wash site, which includes valet bays and temporary cabins, located on a 0.2-hectare concrete area in Wetherby.
Our main aim was to ensure compliance with Leeds City Council policies and national flood risk regulations to support the planning approval process. The site is positioned approximately 430 meters from the Sand Beck watercourse, primarily within Flood Zone 1 (low risk), with a small section in Flood Zone 2 (medium risk). Historical data shows no significant flooding incidents in the area.
Drainage Condition:
Our flood risk assessment identified several potential flood sources, including fluvial (river), pluvial (surface water), groundwater, and sewer flooding. The analysis revealed low risk for all sources, with the only concern being minor surface water pooling along the Carr Lane access route during heavy rainfall. This was considered a minimal risk and did not pose a significant threat to the site’s development.
The lack of substantial drainage infrastructure in the area highlighted the importance of site-specific water management solutions, and with our expertise, we knew we could deliver a seamless solution.
See the summary of flood sources and their anticipated risk to the site below.
Design Package:
To effectively address surface water management, we proposed a sustainable drainage system (SuDS). The design included channel drains to handle stormwater from a 1-in-100 year event, with an additional 40% allowance for climate change impacts. This system ensures that runoff is managed effectively, returning the flow to pre-development levels to prevent downstream flooding.
The design also incorporates climate resilience strategies, projecting a 20-34% increase in river flows by 2080, as outlined by the Environment Agency. This comprehensive approach ensured that the development met flood risk management standards and reduced the potential environmental impact.
Get in touch with Onn Point Civil Engineering to find out what we can do for you and your project.
Mastering Flood Risk Management with Expert Solutions
Discover how our expert flood risk assessment and sustainable drainage strategy helped a car wash in Wetherby navigate potential flood risks and secure fast planning approval.
Read the full case study here.
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