required cross-sectional area → nominated profile dimensions · all mm / mm²
Depth above the design waterline, excluded from effective area. Leave 0 if the engineer's figure is already the gross section — confirm which one they've given you.
SOLVE back-calculates that dimension from the required area, holding the others.
Effective area
– mm²
Margin vs required
–
Waterline width
– mm
–
Geometric section calculator only — waterline set at (depth − freeboard). Check the nominated section against AS/NZS 3500.3 minimums, fall, sump/overflow provisions and the hydraulic engineer's design before documenting.