1. Effective drainage capacity in the planning stage

The effective drainage capacity of all the roof drains allocated to a roof surface or roof segment is not allowed to fall short of nominal drainage required by the calculation.
*DrainStar Siphonic Calculator: Calculation/Drainage Capacity)

2. Calculation of an implemented pipework

When checking an implemented siphonic system, the actual drainage capacity of the roof drains must amount to at least 95 % of the nominal drainage.

1. 规划阶段的有效排水能力

屋面表层或屋面部分分配的有效排水能力必须符合计算要求的名义排水能力。 *管道之星(DrainStar)虹吸式计算机：计算/排水能力

2. 管道系统实施计算

当检查一个正在实施的虹吸式系统时，屋面水管实际排水能力必须至少达到名义排水能力的95%。