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Case Studies

The Nose has it in Effluent Disposal

July 05th, 2019
Odour control was a big factor in the design of the effluent system for the Oringi Freezing works. Attention to detail paid off.

The Oringi Freezing works wanted to overhaul their old effluent disposal system. Consultant Hamish Lowe from Glasson Potts Fowler called in ADL to help in the design. Hamish says they chose Dave from ADL to bring an independent approach to irrigation design.  “I thought the design was very efficient because Dave doesn’t push one particular product.  He is one of the few independent designers around.”

ADL chose center pivots with rotary boom irrigators to dispense the effluent on local farmland. Odour was controlled by nozzle choice, providing for decreased atomisation and therefore less odour. Keeping the nozzles low to the ground also helped. The tendency for effluent blockage had to be carefully considered in nozzle choice, and the Nelson sprinkler was chosen to meet all the demands of the project.

The effluent system has allowed Oringi Freezing Works to turn an area of gum trees into highly productive land without unnecessarily offending neighbours with odour and achieve what Hamish Lowe describes as an “efficient discharge of waste water.”

Business: Oringi Freezing Works
Designers: ADL
Products: ADL/Installer
Management: Glasson Potts Fowler
Area: Dannevirke

Watering the Links Residential Development

July 05th, 2019

Residents of the Links in New Plymouth are surrounded by lush green parks, thanks to their pop-up sprinkler system.

The developers of the Links chose Weathermatic pop up sprinklers and an ADL system design based on cost and efficiency. They could draw out the spacing for lower capital investment and still get a uniform application. ADL designed the system and Adim Pumping & Engineering installed it. Gary Thomas who was the installer for the project says he chose to work with ADL because they offered a free design service for the project.

The system irrigates the gardens, playgrounds, grassed areas and other park environments. It needed good wind resistance, reliable filtration and efficient pumps that could cope with the elevation differences at the site.
Stage two of the links development is now on the drawing boards, and stage one is looking lively with well watered park areas.

Designer: ADL
Products: ADL/Installer
Installer: Adim Pumping & Engineering

Irripod System overcomes obstacles

March 25th, 2019
irripod irrigation sprinkler system

Irripod System overcomes obstacles

Like many New Zealand farms, Bob Scott's Wairarapa property is not laid out in uniform blocks like a city street. Interesting paddock shapes, power lines and trees made Irripod the logical choice for Bob's farm irrigation.

Bob approached GV Electrical for help with his farm irrigation system. They called in ADL to design a cost effective efficient system and supply quality products. Bob chose to install the system himself and says he found installing it really straight forward.  “Dave (from ADL) gave good instructions to follow,” he says, “The worst part of installing the system was 'the thought of it'.  It was a relatively big job.  Once the work began the biggest challenge was making sure all of the PVC was glued and joined securely so it would not leak after being buried underground."

A K-Line type system was the obvious choice for Bob because powerlines, trees and interesting paddock shapes made other irrigation systems impossible. ADL specified the system for optimal performance.

ADL chose the Irripod brand of K-Line type system to allow sprinklers to be spaced more widely and reduce overall capital costs. Nelson “Windfighter” regulated sprinklers were chosen for their good operation in windy conditions and the overall system was designed to ensure a good match between pipe size and sprinklers for both capital and operational efficiency. Now that the system is installed Bob is really pleased with the consistency of coverage.  “It blanket covers a job really well so there is consistent watering,” he says.

ADL went beyond initial system design. Signs were made to indicate where lines should be placed each move. This helps management of the system. ADL also designed the system to operate in two zones operating for 12 hrs each, via control valves. The sprinklers allow for an application rate of 60 mm per 24 hours, but the stony soils on the property mean the soils can only handle 30 mm. By operating the system in ‘shifts’ Bob gets better utilization of capital and can irrigate different soil types at different application rates, with varying return cycles.

Overall the system has worked brilliantly for Bob and he has achieved an impressive 90% increase in milk production.

Farmer: Bob Scott
Designer: ADL
Products: ADL
Installer: GV Electrical
Area: Carterton

Hitting Jack Frost where he hits hardest

March 25th, 2019

Hitting Jack Frost where he hits hardest

The stakes are high in frost prone properties and good frost protection relies on good design and installation. Mike Kirk of Opotiki hit back at Jack with an ADL-designed frost protection system that will cope with temperatures as low as -4o.

Mike Kirk is in a particularly frost prone area. The water source was a particular challenge for Mike. The water intake stream contained silt and algae and resource consent provisions allowed water to be drawn at the rate of 10 litres per
second – not enough to service the 100 litres per second requirements of an adequate frost protection system for the property.

To meet these challenges ADL placed an automatic self cleaning filtration system at the intake then pumped the water into a storage pond. Water can be drawn from the pond at the required rate of 100 litres per second and pumped to the orchard where it is filtered again with manual diskfilters. The pond capacity was chosen to supply enough water for up to three frosts on consecutive days.

Mike’s frost protection system includes sensors for temperature, humidity and potential system failure. The system is monitored from Mike’s home PC and he can leave the whole operation to run automatically or override instructions manually. The whole system needed to be pressure regulated due to elevation differences between the paddocks. Risk of flood on the property meant the system was also designed to operate in flood conditions, as frost often follows storm.

Water for frost protection is delivered above the vines, while irrigation water is delivered below. Nelson sprinklers give excellent uniformity of coverage which is essential for frost protection. It is one thing to design a system that is capable of delivering enough water to the orchard for frost protection. It is another to achieve the uniformity of coverage to protect all areas of the orchard across all services. ADL use computer modelling to specify the whole system to meet these needs.

Orchardist: Mike Kirk
Designer: ADL
Products: ADL/Installer
Installer: Emo Pumping & Irrigation
Area: Opotiki

World First in Dairy Farm Irrigation

March 25th, 2019

World First in Dairy Farm Irrigation

Alan Cooper of Wanganui may well be the first dairy farmer in the world to use pop-up sprinklers for irrigation. Alan chose this system to overcome challenges of topography. Now his idea is really catching on.

Being coastal means a lot of Alan’s property was once sand dunes. Like many coastal farmers Alan went looking for ways to improve the productivity of the dune areas. Flattening dunes is not an option because it removes topsoil, so Alan needed to keep the contour and irrigate for production improvement.

Traditional farm irrigation systems could not cope with the contour. ADL’s solution was pop-up sprinklers normally used on golf courses and other specialist turf applications. This had many advantages, including fertigation, giving him even more ability to renovate his poorer producing land.

ADL and Alan both had concerns that the sprinklers might not stand up to the demands of the job – especially the hard time given to them by Alan’s stock. Alan trialled a couple of sprinklers in his paddocks before committing to the system and was relieved to find they stood up to the task.

Alan has now had this system installed for three years and has never suffered any stock damage. The system operates via a controller at his home and is usually operated at night when the coastal winds are lower. Alan first installed the system on his flat land and is now extending it to take his more marginal land into high production.

With capital costs in the order of $10k per hectare, this system required a large investment, but has relatively low running costs and needs virtually no labour input. The system is paying for itself through productivity gains.  Alan is pleased with the results.  “The main thing I like about the system is the ability to run in conjunction with normal farm activities.  There are no restrictions with stock movements or tractors,” he says.

Farmer: Alan Cooper
Designer: ADL
Products: ADL
Installer: Farmer

Three orchards, three different designs

March 20th, 2019


Each of Chris Dunstan's orchard developments is different from the next. So are their ADL-designed irrigation and frost protection systems.

ADL have designed water systems for three of Chris Dunstan’s kiwifruit orchard developments totalling approximately 35 hectares. All have had unique challenges and required the use of different products, filtration and control systems. Chris says he chose David to do the design because of his independent approach. “He did not latch his design to a compulsion to purchase products or use a particular installer,” says Chris. “Where its been appropriate we have asked him to quote on supply of product, and his prices have been right.”

In each case the choice of system has been driven by the topography, water source, micro-climate, area and type of crop training method. In one instance ADL recommended a settlement pond system for water quality. In another they recommended an automatic screen intake to reduce sand, silt and algae where a combination of low water table and soil type meant a settlement system was not possible.

One of the blocks has a particularly complex system with three pump systems and three separate filtration systems. Some water from a warm water bore is mixed with the cold for under vine irrigation in one part of this orchard that it not highly prone to frosts. To date this has proved sufficient frost protection in that situation.

ADL designs each system, and even each section of a system to the specific needs of the block for an optimal balance between capital investment and running cost efficiency. Chris has been happy with the results. “They have all been to a high standard. If anything they are over specified, not under specified. It is usually a challenge for orchadists when it comes to frost protection and irrigation. A lot of systems aren’t quite up to the job,”


Developer: Chris Dunstan
Designer: Irrigation Express
Products: Irrigation Express
Installer: Orchard Staff
Area: Tauranga/Whakatane