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Sustainable Urban Drainage Systems (SUDS)

For any new development it is now important to provide suitable solutions to dispose of surface water. These practices are governed under various pieces of UK legal guidance including PPS 25, Building Regulations Part H (England and Wales) and Part M (Scotland and Northern Ireland) and Planning Guidance Information.

Adequate performance will normally be achieved if the system conveys flow to a suitable outfall, minimises the risk of blockage, has sufficient capacity and does not increase the vulnerability of the development (or downstream) to flooding.

In all cases the first method should always be to utilise infiltration techniques, which mimic the existing  or pre-development as far as practicable. Percolation testing is undertaken in accordance with CIRIA 156; soakaway sizing and design is undertaken in-house.

Where soakaways are not permitted (either due to contaminated land or localised geology) the next suitable method for surface water disposal is via a suitable outfall – usually a nearby watercourse. Calculations of the Greenfield runoff rates and expected rainfall intensities are used to calculate the required attenuation storage volume on site.

The final solution for surface water disposal is via the combined sewer, which requires prior acceptance from the Sewerage Undertaker.

All designs are undertaken by experienced individuals who take environmental best practice seriously as well as securing future development.

Here at Premier Water Solutions Ltd we optimise surface water design structures using computer software and real time animations using rainfall events and durations. This reduces the size of the attentuation tanks or ponds, hence saving on capital costs for the developer.