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Siphonic system with introduced sump and snorkel overflow arrangement


The black sump area has been coloured for clarity


3. The inclusion of sumps: where conditions allow, can be of great advantage, including improvement of the performance of the siphonic system to helping to minimise maintenance.


The design rainfall event in the UK is 2 minutes (the most intense period of a storm), and so a siphonic system must be designed to function in half of this time.


If the sole of the existing gutter can be insulated to provide a depth of, say 50mm, this depth could be used to introduce Unifold® sumps at the outlet positions.


The siphonic outlets at the bottom of the sump fill more quickly and become "fully operational" with only relatively light rainfall.


This also helps if the siphonic outlet is positioned at the side of the gutter or in a side box, a common situation when the sole of the gutter is directly above the eaves beam. The sump will help to concentrate water at the outlet and so improve performance.


The UNIFOLD® Solution


01384 252777 Phone us


These sumps can be fitted with large leaf guards/strainers covering the entire sump area. They provide a


much greater surface


area than the siphonic outlets and are less liable to blockage, reducing the maintenance sensitivity of the system.


unifold@ampteam.co.uk Click on email


www.gutterliners.com Click on website


UNIFOLD® gutter lining system Gutter systems utilising Siphonic Drainage


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