public
Pipe length
$$ L_{pipe} = 100 \:
m $$
Fluid velosity
$$ V_{fluid} = 3 \:
m/s $$
Pipe internal diameter
$$ ID_{pipe} = 0.25 \:
m $$
Friction factor
$$ f_{Darcy} = 0.0197 \:
$$
Head loss
$$ Hf_{pipe} = {f_{Darcy} \cdot \left({ \left({ L_{pipe} \cdot V_{fluid} ^ 2 }\right) \over \left({ ID_{pipe} \cdot 2 \cdot g }\right) }\right)} \:, m $$