The Hazen-Williams Eq'n to calculate head loss as presented in CERM 10 is stated:
hf = (10.44*L*Q^1.85)/(C^1.85*d^4.87), for US units.
However, in the Standard Handbook for Civil Engineers the Hazen-Williams Eq'n to calculate head loss is stated:
hf = (4.727/d^4.87)L(Q/C)^1.85, for US units. NCEES seems to support this eq'n instead of the Lindberg eq'n but I cannot figure out why there is such a significant difference between the value of the constant between the eq'ns. What am I missing?
hf = (10.44*L*Q^1.85)/(C^1.85*d^4.87), for US units.
However, in the Standard Handbook for Civil Engineers the Hazen-Williams Eq'n to calculate head loss is stated:
hf = (4.727/d^4.87)L(Q/C)^1.85, for US units. NCEES seems to support this eq'n instead of the Lindberg eq'n but I cannot figure out why there is such a significant difference between the value of the constant between the eq'ns. What am I missing?