Also , it does not account for the temperature or viscosity of the water .
The Hazen -- Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water .
Also , equation does not account for the temperature or viscosity of the water .
The Hazen -- Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is only valid for water .