Experimental formula on the frictional resistance of the gum hose for the use of a power sprayer

Abstract

I found the next formula on the coefficient of the frictional resistance of the gum hose (The common name 5/16″×2B) by my experiments.
Let h=λ⋅l/d⋅v²/2g
Then, I found
λ=0.092145 Re^-0.12
However
h=head loss of the gum hose in some length (m)
l=Some length of the gum hose (m)
d=Inner diameter of the gum hose (8.28×10^-3m)
v=Velocity in the gum hose (m/s)
λ=Coefficient of the frictional resistance of the gum hose.
Re=Reynolds' Number
When we think about the influence of high pressures. λ_p=λC_p
h_p=h×C_p×R_p
However
C_p=[1+0.000048p/(1+0.00085p)(1.002)^p]
R_p=1-0.000223p/1+0.00085p
p=Given high pressure