For project examples related
to this capability.

Irrigation

Efficient irrigation has the ability to increase food production manyfold in areas that lack consistent rainfall or have regular rainfall shortages.

Droughts have become a regular event in the New Zealand climate, particularly along the East Coast. With more intensive farming and horticultural practices irrigation is a key component in increasing or maintaining production.

Expertise

Tonkin & Taylor has extensive experience in the study and development of headworks for irrigation in New Zealand, the Pacific and Southeast Asia. T&T provides a full range of services in all engineering and resource consent aspects of irrigation.Typical services include:

Concept and Scoping Studies:

• assessment of potentially irrigable areas
  
• increased production potential
  
• groundwater and surface water yields
  
• conjunctive uses e.g. water supply, hydro
  
• project definition and value engineering
  
• headworks engineering e.g. intakes, dams, canals
  
• cost estimating and economic modelling
  
• environmental scoping and assessments.

Feasibility Studies and Design:

• hydrological modelling for yield and security of supply
  
• flood hazard studies
  
• geotechnical investigations and assessments including seismic risk
  
• hydraulic and civil engineering design
  
• contract documentation
  
• costing and programming
  
• design review during construction.

Consents:

• compliance with environmental legislation
  
• resource and building consent applications
  
• consultation with potentially affected parties
  
• assessment of environmental effects
  
• consent renewals.

Construction Management:

• site supervision and management
  
• cost and timeline programming
  
• commissioning.

Scheme Management:

• preparation of operating, maintenance and surveillance manuals
  
• emergency action planning
  
• surveillance, monitoring and evaluation
  
• risk analysis
  
• safety reviews
  
• asset valuation
  
• instrumentation and calibration
  
• peer review and expert witness
  
• rehabilitation and upgrading.

Experience

The headworks (dams, intakes, canals) associated with irrigation schemes are a fundamental area of Tonkin & Taylor's experience with 17 large dams designed and constructed in addition to numerous intakes and canals built for irrigation, hydro and water supply.

Recent Projects include:

• the 50 m high Opuha multi-purpose dam built in South Canterbury
  
• options studies and a full feasibility study for large multi purpose schemes in Mid Canterbury
  
• inspection, remedial works design and asset valuation of the 67 km long Rangitata Diversion Race carrying 30 m³/s
  
• the Waingaro and Manuwai irrigation storage dams in North Auckland
  
• resource consents for the Mangakahia Irrigation Scheme in Northland.

For more information contact Grant Lovell.

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