Drainage Impact Assessments

When applying for planning permission for a new development, commercial build, or significant extension, local planning authorities and water companies often require a detailed Drainage Impact Assessment (DIA) or Drainage Strategy Report. CleverWorks provides comprehensive, compliant assessments to support your planning application and prevent costly delays.

What Does an Assessment Include?

Our detailed reports outline exactly how foul and surface water will be managed on the proposed site, ensuring no increased flood risk to the property or surrounding areas. A typical assessment includes:

• Existing Infrastructure Mapping: We utilize topographical data and comprehensive CCTV Drainage Surveys to accurately map the existing foul and surface water assets on and around the site.
• Flood Risk Analysis: Evaluating the site's vulnerability to flooding from various sources (fluvial, pluvial, groundwater).
• SuDS Integration: Proposing Sustainable Drainage Systems (SuDS) such as soakaways, attenuation tanks, or permeable paving to manage surface water runoff at the source.
• Discharge Calculations: Calculating peak flow rates, required attenuation volumes, and allowable discharge rates to public sewers or watercourses.

Expert Reporting for Smooth Approvals

We understand the strict requirements of local authorities and the Environment Agency. Our robust, clearly presented reports are designed to satisfy planning conditions and facilitate a smooth approval process for your development.