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Design Specification
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Water is your most valuable asset and resource - vital to your business.



This extract is taken from the ” New Zealand Irrigation Code of Practice”,

  • “In general, irrigation has been highly successful and has driven agriculture expansion in the drier areas, improving and sustaining the general well-being of rural communities – something that would not have been possible without irrigation. However, some irrigation systems have under-performed in economic terms, and independent irrigation audits have highlighted shortcomings in irrigation system design and management. Reasons include;

    Unrealistic expectations by the owners at the system appraisal stage;
  • Capital cost over-runs;
  • Poor irrigation system management and service provisions; and
  • Poor understanding of client priorities and needs.”


In todays world you wouldn't build a house or a commercial building without a design specification being produced, so why invest heavily in an irrigation system without one.

Having myself been involved in the manufacturing, servicing, designing and sales of irrigation systems over the past 24 years,  there is a need for you to be positively certain that the system you invest in, has been well designed and has covered all aspects of your needs and wants and is not compromised in any way, shape or form.

With a " Design Specification Document" from IESL, you will be provided;

  • Realistic targets
  • Clarified design parameters
  • Reduced risk of capital cost over- runs
  • Comparability
  • Commisioning targets

The irrigation supply company is then given direct and relevant information to design and quote towards giving you the best opportunity, to have the best system available.


The " Design Specification Document" covers the list below in all irrigation systems but due to different systems there is specialised information to large to list here that is required for to complete the specification document.


  • Soil Types
  • Water Holding Capacity (WHC)
  • Readily Available Water (RAW)
  • Infiltration Rate (mm/hr)
  • Crop Irrigation Demand (m3/Ha/week)
  • Required Weekly Volume (m3/Week)
  • Maximum Allowable Depletion  (MAD)
  • Distribution Efficiency (%)
  • Hydraulic Efficiency (%)
  • Mainline Flow Speed (m/s)
  • Headworks Efficiency (%)
  • Pump Efficiency (%)
  • Return Interval (days)


It is too important for you not to have this done when investing in an irrigation system, no matter how big or small

Call Richard on 0210 359 239 or us the contact us page of this website