Tap Size vs. Turf Area Table#
This table is intended as an aid for irrigation design. The values are calculated assuming peak daily evapotranspiration rates of 0.25 inches for Kentucky Bluegrass and 0.20 inches for Turf-type Tall Fescue. For the purposes of the calculations, assume that the irrigation efficiency and tap utilization efficiency are equal to 100 percent, and the maximum time of irrigation is 8 hours. More realistically, however, this would be equivalent to irrigation and tap utilization efficiencies of 80 percent, and a maximum irrigation time of 12 hours.
These maximum discharges assume a disk-type meter. In certain cases irrigation-only taps that are 1-1/2 inches or larger, turbine meters are allowed, which have higher maximum discharge limits.
|
Tap Size |
Maximum Discharge (gpm) |
Maximum Bluegrass Area |
Maximum Tall Fescue Area |
||
|---|---|---|---|---|---|
| sq.ft. | acres | sq.ft. | acres | ||
| 3/4" | 10 | 30,800 | 0.71 | 38,500 | 0.88 |
| 1" | 25 | 77,000 | 1.77 | 96,000 | 2.20 |
| 1 1/2" | 50 | 154,000 | 3.54 | 192,500 | 4.42 |
| 2" | 80 | 246,500 | 5.66 | 308,000 | 7.07 |
| 3" | 160 | 493,000 | 11.32 | 616,000 | 14.14 |
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