Planning and Sustainability Seminar A Systematic and Integrated Drainage Approach Jessica Johns Micro Drainage Limited

Minor 1D Below Ground Urban Engineered SFA6/Building Regs Major 2D Above Ground Rural Environmental Impacts PPS25/TAN15

Integrated Approach Minor 1D Below Ground Urban Engineered SFA6/Building Regs Major 2D Above Ground Rural Environmental Impacts PPS25/TAN15 ////////////

The Pitt Review - Thatcham July 2007 – 1,107 homes flooded 200(+) year return period rainfall Traditional drainage Model matched event

Thatcham

IUD - Upton Integrated Urban Drainage Approach Sustainable Drainage Systems in place Tested with extreme flood event Flooding much less severe - follows the swales Case Study in CIRIA C635

Upton

Planning Think about drainage early Load Digital Terrain Model Deluge site with extreme rainfall Identify ‘Blue Corridors’ / Flow Routes

Holistic & Integrated Approach Assess pre-development runoff rates/volumes Design flow conveyance system Limit post-development runoff Incorporate SUDS for attenuation & infiltration

Testing for Exceedance Model overland flow paths for exceedance return period with Climate Change

Conclusion Planning Guidance is key Technology is available Systematic and Integrated approach with early planning