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O’Sullivan Macfarlane have successfully undertaken Drainage Assessments  and flood risk assessments for a wide range of clients including private individuals, developers, planning consultants, architects, contractors, housing associations, and architects. Our fully equipped in-house team of locally based environmental specialists can provide all aspects of Drainage Assessment including Schudule 6 applications to Rivers Agency.

All Drainage Assessments are carried out in line with government guidance PPS 15 (Rivised Planning Policy Statement 15) ‘Planning and Flood Risk’.

Drainage Assessment Services in Northern Ireland (NI) include;

• Site Visits / Walkover by a qualified Environmental Scientist;
• Review of site development proposals / planning application;
• Submission of a Schedule 6 agreement under the Drainage (NI) Order 1973;
• Detailed review of the current Revised Planning Policy Statement 15 ‘Planning and Flood Risk’ (Policy FLD 3 & 5) in relation the proposed development;
• Calculation of expected peak rainfall at the proposed site;
• Calculation of existing and proposed site Runoff;
• Production of a Drainage Assessment Report and submission to Planning Service;
• Discharge Options and Application (if required);

With a combined experience of over 15 years, drawing on experience from both the private sector and the Northern Ireland Environment Agency, we have significant expertise in the field of Drainage Assessment. All our work is provided in-house using locally based Environmental Consultants. Our staff are members of the Institute of Environmental Science (IES) and the Chartered Institute of Waste Management (CIWM).


Background to Drainage Assessment and Flood Risk Assessments in Northern Ireland (NI)

The requirement of Drainage Assessments and Flood Risk Assessments in Northern Ireland is driven by the Planning Service consulting with the Rivers Agency on planning applications in circumstances where it appears, on the basis of prevailing information, that a sites drainage infrastructure is a material consideration in the determination of the development proposal. The purpose of the consultation will vary according to the circumstances, but will often involve seeking advice on the nature and extent of the flood risks with respect to ineffective drainage, and the scope for management and mitigation of the associated risk where appropriate. The outcome of the consultation may require the developer / applicant to carry out a Drainage Assessment for the proposed development to facilitate further assessment of the proposed development.