Em4885 irrigation management practices to protect ground water

4 CHAPTER
The actual technique involves placing the lateral lines in alternating positions, “offset,”
from one irrigation to another. Note that the distance between laterals remains the same
from irrigation to irrigation. The spacing of the alternating position is one-half a lateral
move. The laterals may be in the normal mainline position, next to risers, for one irrigation.
A swing-line is used at each lateral to allow placement halfway between mainline risers
for the next irrigation. The intention is that any wet and dry spots will be moved around
the field as the laterals are placed in the alternating positions.
45'
45'
22.5'
FIGURE 4-14. Schematic of lateral offsetting - laterals are placed in positions indicated by solid line
for irrigations 1, 3, etc., in positions indicated by dashed lines for irrigations 2, 4, etc.
IP 2.03.05 - Operate in Low-Wind Situations if Possible
Objective
Reduce detrimental effects of wind on overlap uniformities. Also, this will reduce wind
drift of chemicals during chemigation and could lower water losses due to immediate
evaporation during the application.
Description
This practice is another option for dealing with excess wind. It simply entails operating
the system during periods of low wind.
54
Sprinkler mainlin
placement for irrigations 1, 3, et
placement for irrigations 2, 4, et