Free Online Segmented, Variable Depth, Irregular Weir Flow Calculator

By Thomas Gail Haws, P.E.

Headwater elevation, (ft or m)

Weir coefficient (Depends on weir. For a broad-crested weir, varies from 2.3 to 3.3 for feet units depending on crest width, depth, and upstream edge shape)

Weir Points
Station	Elevation	Ponding Height	Incremental Flow	Cumulative Flow

or +/- the number of rows

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Notes

Weir Equation: q = if (length = 0) then 0 else if (slope=0) then cw*length*d0^1.5 else cw/(2.5*slope) * (d0^2.5 - d1^2.5) where d1 and d0 are always positive or zero

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