720175Pressure Assisted Rainwater Systems.ClosedGRD Development of PrototypeInnovate UKGravity-fed drainage systems are inefficient, rainwater and air mix to create oscillating flow. Commercially available siphonic systems operate by negative pressure sucking water up to 100% full flow. The major limitation with modern siphonic systems is that the basic antivortex unit incorporates a series of fins and baffles that cause blockages causing failure. Enverflow Ltd concluded a proof of concept project in 2009, the company validated a decked gutter pressure assisted system with primary and secondary flow channels, further the introduction of laminar induced flow units that do not require fins of baffles to create negative pressure. The project proved the technical and commercial viability of dissipating water safely at 100% full flow up to 500m intervals instead of the currently restricted 200m through pressure assisted flow without the use of fins and baffles. This eliminates the need for multiple discharge pipes within large buildings and unsightly internal and external high level pipe work; the system also allows for the incorporation of Rain Water Harvesting (RWH) solutions. Enverflow wish to develop their Pressure Assisted Rainwater System (PARS) to meet UK & EU standards by also indentifying and implementing recycled composite and alternative metallic materials in order to enhance the flow, pressure and self priming nature of the proposed systems. Qualification will be assessed through the use of Automatic Data Processing (ADP) Computational fluid Dynamics (CFD) software. Enverflow state that the UK siphonic industry is currently worth in excess of £20million and growing approximately 5% per annum, the total UK/EIRE rainwater market is worth £66million. The company envisage capturing 10% (£2 million) of the UK siphonic market within the first 3 years of launch moving to 20% (£4 million) within year 5; in parallel, capturing up to 5% (£15million) of the EU and global siphonic market by year 5.