The Calculated Flow Difference field (highlighted in pink below) is based on the difference between the US/DS calculated flow (highlighted in blue below).

These highlighted fields are described in the table below:
| Field Name | Description | 
| US Calc Flow | The flow calculated from the depth measurement using the Mannings equation in gallons per day. | 
| DS Calc Flow | The downstream manhole calculated flow minus the upstream manhole calculated flow in gallons per day. | 
| Calc Flow Diff (gpd) | The downstream manhole calculated flow minus the upstream manhole calculated flow in gallons per day. |