Necessary to back up one side and or move the other

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necessary to back up one side and or move the other side forward until it is in the correct position ps” between contacts in the control box, but put manual switches in just for this ms out beyond the wheels at tower locations, either in back of the lateral or on b Water Supply Water is usually supplied to the lateral via: 1. a concrete-lined trapezoidal-sectioned ditch, o 2. a flexible hose (often 150 m in length), or 3. automatic hydrant coupling devices with buried mainline ays along a rectangular field, perpendicular to the alignment of the lateral pipe The varia tion of flow rate in a linear move lateral is directly proportional to distance along the lateral pipe, whereas with center pivots it is proporti a function of t of the machine, and the other tower on a center pivot) Usually, each tower is independently gu ba ly getting out of alignment with the field) ause the fingers will lose physical contact e ateral gets out of alignment with the field and shuts o This can involve electrical “jum some manufacturers and some installers purpose Some linear moves are fitted with spray nozzles on drop tubes or booms If they are spaced closely along the lateral, it may be necessary to put boo oth sides of the lateral r
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Merkley & Allen Page 176 Sprinkle & Trickle Irrigation Lectures Hose-fed systems require periodic manual reconnection to hydrants on a mainline – it is kind of like a period-mo yourself whether the linear move machine is worth the cost in this case! With the automatic hydrant coupling machines (see Fig. 15.3) there are two arms with pipes and an elbow joint that bends as th down the field. The two arms alternate in connecting to hydrants so as not to disrupt the irrigation nor the forward movement of the machine. These are m The advantage of hose-fed and automatic coupling linear moves is that you don’t need to have a small, uniform slo water is supplied from a pressurized mainline instead of an open channel O switch on the linear move contacts, shutting down the pump and reversing the direction of movement so that it automatically returns to the starting end of the field. The advantages and disadvantages of the di ve system, and you have to ask e linear move travels echanically complex. pe in the direction of travel, because n ditch-fed systems there can be a structure at the end of the field that a tch-feed system are: Pros Low pressure (energy) requirement Totally automated system More frequent irrigations than h available to move the hose ose-fed, since no one needs to be Cons Trash and seeds and sediment pass through scree nozzles extra weight Pros and Cons Compared to a Center Pivot Pros n and may plug The pump must be on (move with) the lateral, causing Should have uniform slope along the lateral route Eas ir e, but not imp eral, rather than twice the No end gun is required y rigation of a rectangular field (important if land is expensiv ortant if land is cheap and water is scarce)
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  • Fall '03
  • Sprinkle
  • Center pivot, Merkley, Irrigation Lectures

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