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Trash racks

Values for calculation

$ Q_{max} $ $ \mathrm{m^3/s} $
$ w $ $ \mathrm{mm} $
$ h $ $ \mathrm{mm} $
$ t $ $ \mathrm{mm} $
$ b $ $ \mathrm{mm} $
$ g $ $ \mathrm{m/s^2} $
$ α $ $ \mathrm{°} $
$ K_s $

Calculation

Velocity of flow through trash rack, computed gross area

$$v=\cfrac{Q_{max}\cdot 10^6}{w\cdot h}$$

Loss of head through racks

$$h_t=K_s\cdot\left(\cfrac{t}{b}\right)^{\cfrac{4}{3}}\cdot\cfrac{v^2}{2\cdot g}\cdot\sin{α}$$

Loss coefficient

$$ζ=\cfrac{2\cdot g\cdot h_t}{v^2}$$