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System CA Computation

How does StormCAD calculate System CA? It seems that System CA = (Total Area Tributary to Node x Composite Runoff Coefficient) - (Bypass CA + Carryover CA). When I calculate this computation manually, it matches StormCAD's reported System CA value, however the further I move downstream in my system, there is a larger difference between my calculations and StormCAD. Is there another parameter that should be included in this calculation? How does StormCAD compute System CA moving further downstream in a storm sewer system?

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