Siphonic drainage was first introduced in the 1960 s in scandinavia and since then has been used widely across europe including the uk in the far east australasia south africa and the usa. A siphonic roof drain system is truly an engineered system to design a traditional roof drain system by code plumbing engineers simply follow prescriptive instructions in the code and read off of pre calculated standardized charts. Many large industrial commercial and retail buildings are now fitted with siphonic drainage which has clear advantages over gravity drainage.
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