Plants report this metric constantly, so it needs to be bulletproof. The standard BOD pounds formula is straightforward—Concentration (mg/L) × 8.34 × Flow (MGD)—but most issues come from where it’s placed and how it’s tested. Build a dedicated destination LP named “BOD Pounds,” confirm both inputs exist at your chosen location, and only then attach the logic.
The equation and destination
Create or confirm the BOD (mg/L) and Flow (MGD) LPs at the same location. Open the “BOD Pounds” LP → Attach Formula. Insert tokens with the picker to get [Location:Parameter] exactly right, then enter [*BOD*] * 8.34 * [*Flow MGD*]. Keep a clear Remarks note that states units and, if used, any rounding.
Validation that takes 60 seconds
- Choose a date with known inputs and click Test.
- Highlight each token and hit ! to peek the value the engine sees.
- Recalculate on a handheld calculator and confirm an exact match.
- No data? Enable Use values from test data, enter sample BOD and Flow, and verify the result.
Rounding and precision
Operator10 stores precise values; round only for display requirements: ROUND(<expression>,0) for whole pounds. Avoid premature rounding if the result will feed other KPIs.
Common fixes
- Blank output: missing input on that date.
- Wrong magnitude: token pointed to the wrong LP or unit; reinsert via picker.
- Second-click success: move flow-derivation logic above pounds in calc order.
Document a “golden test” (inputs, date, expected pounds) so anyone can re-verify the BOD pounds formula during audits or training.
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