#Irrigation system designer install#

Grommet line) – The sub-main connects to the outlet of the valve leg. It is also common to see air valves fitted on these uprights as it is normally located at the highest points.

The high-pressure pipes are used for uprights as they are more rigid to withstand the elements and vandalism which can be made from PVC pipes, galvanised steel pipes or HDPE pipes. High-pressure pipes (class 9 or 12) PVC pipe is used for theses T-offs.

These pipes normally make an inverted U-shape to bring the control valve above the surface. Valve leg) – This is where the control valve is inserted to connect to the main line. The pipes in a block are subdivided into three categories. The pipe type to be used very important in this phase as each pipe type has different internal dimensions and friction coefficients. The design calculates the discharge of each sprinkler. On this block layout, a design is drawn up to manipulate pipe sizes for water uniformity of no less than 80%. Other reasons for irrigation block division is soil differences or cultivar differences. It also ensures better control over pressures through-out the block. The total area then gets sub divided into viable irrigation blocks, to reduce cost as larger blocks require larger pipes. This is done by sectioning unused areas like roads, netting-anchors or windbreaks. Once the free-standing span is located, calculate the position of the centerline of the ditch approximately 12 feet outside of the flenge on the l inear cart.Ĭonsider potential for moving system beyond field boundary for convenience during cultivation and harvest operation.This step sees that a block layout is done from the surveyed map to determine the cultivar area. Remember to add 1.7 feet for transition pipe. At the approximate center of the system, locate the free-standing span, considering GPM requirements, pipe sizing, available span lengths, etc. The shortest dimension, if any difference will be used to determine the maximum system length, less 6 feet on each side for clearance. Center feed and new ditch (right picture) Also remember that the free-standing span (with boss unit) in the center of the field must be positioned approximately 12 feet away from the center line of the ditch, using the span flange as the calculation point. Also deduct 6 feet from each end for clearance. Remember to add 1.7 feet for the transition pipe. The shortest dimension “E” or “G” added to the shortest of “F” or “H” will be used to determine our irrigation system design length.

#Irrigation system designer install#

The shortest dimension, less 6 feet clearance, less 12 feet inlet, less 4 feet ditch (centerline) is the longest system that we can install (considering span lengths).Ĭenter feed and existing ditch (left picture) The shortest dimension, less 12 feet for inlet length, for dirt ditch, and 7 feet for concrete ditch, less 6 feet for end tower or overhang clearance is the longest linear irrigation system we can install (assuming that span lengths can be arranged to fit). Definition of dimensional terms End feed and existing ditch (left picture)

Also there are two possibilities concerning the ditch: it may be an existing ditch or we may have to locate and construct a new ditch. This, of course, determines whether we have and end feed or center feed system. The initial field/system design for the l inear System begins with the determination of field dimensions and the location of a ditch, either at the edge of a field or through the approximate center of the field. There are many variables to be considered, and specific recommendations are sometimes difficult to determine, but the well-informed system designer should be able to combine the information in this design guide with his own knowledge and information from other sources to arrive at a well-designed irrigation tool for the farmer. This guide does not attempt to cover the basic linear irrigation system design considerations such as water quality, crop consumptive use requirements, water management, climate, etc it is assumed the irrigation designer will have already investigated these factors, and is now faced with having to consider how a linear irrigation system might be applied to a specific situation. The purpose of this design guide is to acquaint the irrigation designer with some of the unique considerations involved in designing linear irrigation system installations.