将管线上每个阀门、弯头、三通、水表和进水口的 K 值相加,并输入其总和。可通过该输入项旁的链接查看典型值。在长距离输水干管中,这些损失相对于沿程摩擦损失而言较小,但在较短的站内管道中,它们可能占损失的大部分。
Hazen-Williams constants now match EPANET (August 2026)
In August 2026 the Hazen-Williams coefficient and exponent were changed to match EPANET. Head loss results differ from earlier versions of this page by up to 0.1 percent, which is far smaller than the uncertainty in the C value itself.