An important consideration for both Drip Irrigation Systems and Sprinkler Irrigation Systems is pressure loss over distance for distribution, lateral and drip lines. The following chart illustrates basic pressure loss and flow capacity for both Poly Tubing and Schedule 40 PVC pipe.
| Poly Tubing | Max. Flow GPM (GPH) | PSI Loss/100ft | Sch 40 PVC | Max. Flow GPM (GPH) | PSI Loss/100ft |
| 1/2″ | 4.6 (276) | 8.8 | 1/2″ | 4.6 (276) | 7.7 |
| 3/4″ | 8.2 (492) | 6.3 | 3/4″ | 8.2 (492) | 5.6 |
| 1″ | 13.4 (804) | 4.8 | 1″ | 13.4 (804) | 4.2 |
| 1 1/4″ | 23 (1380) | 3.1 | 1 1/4″ | 23 (1380) | 3.1 |
| 1 1/2″ | 33.8 (2028) | 2.9 | 1 1/2″ | 33.8 (2028) | 2.9 |
| 2″ | 52.3 (3138) | 1.9 | 2″ | 52.3 (3138) | 1.9 |
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