Strickler formula

This linear head loss law is parameterised by the Stricker coefficient $K_S$.

The other law parameters are shared with all pressure loss formulas:

• $Q$ : flow (m³/s)
• $D$ : pipe diameter (m)
• $l_T$ : pipe length (m)

$$J_L=\frac{l_T.Q^2}{(K_S.\pi .D^2/4{)}^2.(D/4{)}^{4/3}}$$