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The display of a propeller meter registers both gallons per minute and total gallons. Photo: L. Schwankl.Flow meters serve the dual purpose of providing water application information for irrigation scheduling purposes and monitoring for clogging (for more information, click here).
Here is an example of how to determine the average discharge rate for emitters in a drip irrigation system. Drip emitters were sampled in a vineyard system designed with two 0.5 gph drip emitters per vine and the vines planted on a 7 foot x 11 foot spacing.
Microsprinkler use in a young almond orchard. Photo: L. Schwankl.Microsprinklers were sampled in an almond orchard designed with a single microsprinkler per tree and with the trees planted on a 16 ft x 22 ft spacing.
The utility of the pressure measurement information you can gather from a SDI system is limited due to there being so few locations at which you can take measurements. If you only gather measurements at the head end or tail end of the tape lateral lines, these pressure readings should be consistent.
Drip tape used to irrigate spinach. Photo: D PorterSubsurface drip irrigation (SDI) systems can use either drip tape products or drip tubing systems with either in-line or built-in emitters. The "hard" drip tubing systems use the same type of drip tubing as used in surface drip systems.
Subsurface drip irrigation (SDI) drip tubing microirrigation systems are most commonly used for tree and vine (permanent) crops. These systems come in a variety of designs so it is difficult to provide evaluation guidance that applies to all installations.
Drip tape being installed. Photo: L. Schwankl.Drip tape subsurface drip irrigation (SDI) systems that are typically used for annual row crops range from systems that are entirely below ground to those in which some portion of the lateral line (the head end and possibly the tail end) is exposed.
Centrifugal sand separator. The shaded arrows show the sand; the white arrow shows the water. Source: Courtesy Claude Laval Corporation.A centrifugal sand separator, often used for pre-filtration, removes larger particles of sand.
Figure 11. Sand media filter during the filtration and backflushing processes. Source: Courtesy Claude Laval Corporation.A sand media filter consists of tanks filled with silica sand or crushed granite. Contaminants are filtered from the water as it flows through the filtering media (fig. 11).
