Larall Smart Hydrant - Low Application Irrigators - Irrigators

By: Effluent And Irrigation  06-Dec-2011
Keywords: Irrigation




The new Larall SMART HYDRANT EFFLUENT MANAGEMENT SYSTEM is exactly that…SMART!


Until now there have been irrigation systems that are great at some things but lack in other areas. The Larall Smart Hydrant is a real breakthrough when it comes to irrigators as it has many features which are unique and will assist in making irrigation of dairy effluent easy to comply.

One of the great things about the Larall Smart Hydrant is it extremely portable and easy to transport from paddock to paddock. In addition to this the amount of effluent pumped to each gun can be measured via an ultrasonic flow meter and because of this you can determine the application depth by volume. The Larall Smart Hydrant is activated by pressure and has 16mm nozzles as opposed to normal irrigators which have 11mm nozzles.

The Larall Smart Hydrant records the total volume pumped from both activation and per session, as well as the volume of effluent pumped through each gun per session. The Larall Smart Hydrant monitors the system for insufficient or excess flow to detect blockages and leaks and via a text message signals the system to either turn itself off or notify the farmer by text when the guns need shifting (optional). The Larall Smart Hydrant gives you greater control and more effective management of your effluent as it allows you to limit the amount of effluent applied per shift as well as the ability to automatically tailor the amount of effluent applied to each paddock. No solids separator is required with the Larall Smart Hydrant and by using it the combined area you can irrigate to at one time is greater than 1ha.

The effluent enters the Larall Smart Hydrant and the flow meter measures the volume. Only one of the six valves is opened at one time. The Larall Smart Hydrant directs the effluent through the opened valve to a small stand and sprinkler. Once a set amount of effluent has passed through the meter, the open valve closes and the next valve opens, sending the effluent to the second sprinkler.

How it works

For example, the amount that goes to each gun could be 3m3 (3,000L). At a flow rate of 18m3/hr each valve would stay open for 10min. The sprinkler would have applied 1mm of effluent over a 10min period and most of the area would not receive effluent for another 50min. This is enough time for the effluent to slowly soak into the pasture so there would be very little or no ponding or run off.

Sick of cumbersome effluent systems that are a hassle to move?

Don’t be limited to where you can place the irrigation system on your farm. The Larall Smart Hydrant is portable and is not affected by topography. It’s easy to transport from paddock to paddock and doesn’t require a huge effort.

“NO PONDING OR RUN OFF…
Too good to be true?”

The Larall Smart Hydrants ability to limit the amount of effluent applied per shift and the ability to automatically tailor the amount of effluent applied to each paddock means that the amount pumped to each gun can be measured and controlled (you can determine the application depth by volume). The depth per hour can be as low as 1mm so there is no ponding or run off to deal with. The combined area which is irrigated by the Larall Smart Hydrant at one time is greater than 1ha.

Want a quick and easy way to know when your sprinklers need to be shifted?

After the desired amount of effluent has been pumped to each gun, as an option, the Larall Smart Hydrant will text the farmer and notify him that the guns need to be shifted and will text the pump to turn it off. This avoids over application and gives better utilisation of nutrients.

So how does the Larall Smart Hydrant actually work?

The effluent enters the Larall Smart Hydrant and the flow meter measures the volume. Only one of the six valves is opened at one time. The Larall Smart Hydrant directs the effluent through the opened valve to a small stand and sprinkler. Once a set amount of effluent has passed through the meter, the open valve closes and the next valve opens, sending the effluent to the second sprinkler.

For example, the amount that goes to each gun could be 3m3 (3,000L). At a flow rate of 18m3/hr each valve would stay open for 10min. The sprinkler would have applied 1mm of effluent over a 10min period and most of the area would not receive effluent for another 50min. This is enough time for the effluent to slowly soak into the pasture so there would be very little or no ponding or run off. To determine the effective area per shift we have to allow for the overlapping of sprinklers. So for a 3ha paddock with 3 shifts the effective area is = 0.167ha (1,670m3). The effective application on this area over 10 minutes would be 3m3/1670m3 or 1.8mm - even though the sprinkler has actually spread it at an average of less than 1mm over a larger area. The quantity of nutrients applied to the pasture can be determined by the nutrient values of the effluent. For example if the nitrogen value was 0.35kg /m3, which would, equal 3.5kg of nitrogen per hectare per millimetre of application. 1.8mm application would equal 6.3kg of nitrogen per hectare. If you wanted to apply 35kg’s of nitrogen per hectare to a 3ha paddock (35kgN/ha * 3ha = 105kgN), so this would require the application of 105kgN/0.35kgN/m3 = 300m3 of effluent. Doing this with 3 shifts would be 100m3/shift and at a pumping rate of 18m3/hr it would take 100m3/18m3/hr = 5.5hrs/shift.


Keywords: Irrigation

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