Pipes convey water from one point in the network to another. EPANET assumes that all pipes are full at all times. Flow direction is from the end at higher hydraulic head (internal energy per weight of water) to that at lower head.
Below is the list of Pipe properties:| Field | Description |
| Id | A unique label used to identify the pipe. |
| Start Node | The ID of the node where the pipe begins. This is a required property. |
| End Node | The ID of the node where the pipe ends. This is a required property. |
| Length | The actual length of the pipe in feet (meters). This is a required property. |
| Diameter | The pipe diameter in inches (mm). This is a required property. |
| Roughness | The roughness coefficient of the pipe. It is unitless for Hazen-Williams or Chezy-Manning roughness and has units of millifeet (mm) for Darcy-Weisbach roughness. This is a required property. |
| Loss Coefficient | Unitless minor loss coefficient associated with bends, fittings, etc. Assumed 0 if left blank. |
| Initial Status | Determines whether the pipe is initially open, closed, or contains a check valve. If a check valve is specified then any flow in the pipe must be from the Start node to the End node. |
| Bulk Coefficient | The bulk reaction coefficient for the pipe. Use a positive value for growth and a negative value for decay. Time units are 1/days. Leave blank if the Global Bulk reaction coefficient will apply (see Reaction Options). See Bulk Flow Reaction Rates for further description of this parameter. |
| Wall Coefficient | The wall reaction coefficient for the pipe. Use a positive value for growth and a negative value for decay. Time units are 1/days. Leave blank if the Global Wall reaction coefficient will apply (see Reaction Options). See Pipe Wall Reaction Rates for further description of this parameter. |