This calculator assumes that you are using 1 gallon per hour emitter tubing and that each emitter waters 1 square foot of ground. The configuration could be emitter tubing in a line for row crops, or tubing with emitters coiled around a fruit tree.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ET(in/month) | 0.93 | 1.68 | 2.79 | 4.2 | 5.58 | 6.3 | 6.51 | 5.89 | 4.5 | 3.1 | 1.5 | 0.93 |
| Avg precipitation (in) | 5.93 | 6.23 | 4.53 | 1.82 | 1.28 | 0.23 | 0.01 | 0.07 | 0.35 | 1.73 | 4.04 | 6.19 |
| Irrigation for 1 sqft (gal/month) | 0.58 | 1.05 | 1.74 | 2.62 | 3.48 | 3.93 | 4.06 | 3.67 | 2.81 | 1.93 | 0.94 | 0.58 |
| Net water need (ET-Precipit) | -5.00 | -4.55 | -1.74 | 2.38 | 4.30 | 6.07 | 6.50 | 5.82 | 4.15 | 1.37 | -2.54 | -5.26 |
| Irrigation for 1 sqft (gal/week) | 0.14 | 0.26 | 0.43 | 0.65 | 0.87 | 0.98 | 1.01 | 0.92 | 0.70 | 0.48 | 0.23 | 0.14 |