The value added by involving the engineer at an early stage helps drive efficiencies and eliminate project risks for the client. With 80% of development costs identified at the design and tender stage, early engagement enhances innovation and collaboration to optimize value as the client’s goals and objectives are better understood in the first stages of concept and master-planning.
Patrick Parsons have helped our clients with their due diligence prior to land acquisition by identifying flood risk, drainage, highway, geotechnical and other environmental constraints, at a strategic level, to be considered for planning, statutory approvals, overall scheme viability and buildability.
Recent updates to legislation and standards within the last three years have seen the introduction of the Lead Local Flood Authority (LLFA) as a statutory consultee to the planning approval process for flood risk and surface water drainage evaluation. Associated non-statutory technical standards and guidance following introduction of the LLFA’s role have inadvertently increased the requirements of design parameters, maintenance and operation of sustainable drainage systems for both residential and commercial developments.
Successful designs need to consider local policy documents developed by the Local Planning Authority and should take into account the Local Flood Risk Management Strategy, and associated documents (like local SuDS guidance).
For a high-level flood risk and drainage feasibility, we undertake the following to inform the client’s project and site appraisal;
- Review client information on the proposed scheme
- Desk study of site information including topography, geology and ground conditions, Environment Agency flood maps, surface water management plans (SWMP), national and local planning policies
- Identify key constraints to be considered in a flood risk assessment (FRA) or SuDS & drainage management report for planning
- Initiate early discussions with the local planning authority, LLFA and statutory water authority to clarify hydraulic design and drainage discharge requirements
- Produce a feasibility report and drainage strategy for the proposed scheme.