Compute head loss h_f = 10.67*L*Q^1.852/(C^1.852*D^4.87) from flow, pipe length, roughness coefficient C and diameter (SI units).
由流量、管长、粗糙系数 C 与管径,按 h_f = 10.67·L·Q^1.852/(C^1.852·D^4.87) 计算水头损失(SI)。