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The time it takes to drain the sed tank can be approximated by:

{latex}
\large
$$
desiredT = {{16W_{SedBay} \^{1.5} \tan (AN_{SedPlate} )^{0.5} L_{Sed} } \over {3\pi D_{Valve} \^2 \sqrt {2g} }} + {{\sqrt {HW_{Sed} }  - \sqrt {{{W_{SedBay} } \over 2}\tan (AN_{SedPlate} )} } \over {{{\pi D_{Valve} \^2 } \over {8L_{Sed} W_{SedBay} }}\sqrt {{{2g} \over {Pi_{VenaContractaOrifice} }}} }}
$$

{latex}

where W_SedBay is the width of a single sedimentation bay, AN_SedPlate is the angle of the bottom slopes from the horizontal, L_Sed is the length of the sedimentation tank, D_Valve is the diameter of the drain valve, HW_Sed is the water height in the sedimentation tank, and K_GateValve + K_Exp is the total head loss through the valve.

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