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、管長、粗糙係數 C 與管徑,按 h_f = 10.67·L·Q^1.852/(C^1.852·D^4.87) 計算水頭損失(SI)。