Stormwater drainage goes from your downpipes to your water tanks. It is important to remember that it also includes a short upstand for each downpipe connection and the vertical rise of your water tank, therefore the length of drainage on you invoice will be more than just the distance from the downpipes to the water tanks.
Another consideration is the size of your roof and spouting’s. Residential drainage typically uses 100mm DWV pipe; if you have a large roof area, a single drain may be insufficient for handling the flow. it is done wrong your spouting will overflow every time it rains.
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