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Evaluating performance of irrigated green space: A review of measures Geoff Connellan G&M Connellan Consultants. With information provided by Richard Dilena,

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Presentation on theme: "Evaluating performance of irrigated green space: A review of measures Geoff Connellan G&M Connellan Consultants. With information provided by Richard Dilena,"— Presentation transcript:

1 Evaluating performance of irrigated green space: A review of measures Geoff Connellan G&M Connellan Consultants. With information provided by Richard Dilena, City of Greater Geelong & Peter Symes, RBG Melbourne.

2 There are lots of efficiency terms. Including Water Use Efficiency (WUE) Ref: Irrigation Insights No 5. Fairweather, Austin & Hope, NSW Ag. NPSI WUE “commonly used to describe the relationship between water (input) and the agriculture product” WUE is an Index WUE is used as a generic label for any performance indicators used to study water use in “crop production”.

3 1. Water Use Efficiency Measure of Landscape Outcomes delivered per unit of water input. Strategy: Reduce plant water demand, E.g. Low water use/efficient species 2. Irrigation Efficiency Proportion of the water applied, that is delivered into the plant root zone. Water Use and Irrigation Efficiencies

4 OVERALL IRRIGATION EFFICIENCY APPLICATION EFFICIENCY SCHEDULING EFFICIENCY

5 IRRIGATION EFFICIENCY How much water gets into the root zone ?

6 Efficient Delivery into Root Zone Aim: High Application Efficiency

7 Aim: High Scheduling Efficiency Depth and Timing matched to daily ET ET

8 Factors affecting Application Efficiency

9 Efficiency Demands Uniformity

10 Assessment Individual Sprinkler Heads 1.Individual heads popped up 2.Heads assessed according to the potential fault categories:

11 Auditing – The Can Test Uniformity Testing

12 NOTE This discussion is based on Field or Operational performance measures. *Scheduling Coefficients (SC) and also *Christiansen Coefficient (CU) are important, particularly in terms of the design of systems.

13 Uniformity Testing - Calculating Field DU DU (%) = M25 x 100 M Where: M - average value of all catch can readings. M25 - average of lowest 25% of readings. *Field DU should be greater than 75%.

14 Precipitation Rate (PR) (a) Determined from a can test also (b) Calculated from sprinkler flow rate Valuable data * Validate system performance * Determine Irrigation Schedule

15 Calculating Precipitation Rate Depth (mm) Catch can - A very powerful performance tool!

16 Uniformity of Application Can test readings – Volume (mL) Lowest: 12 mL Highest: 54 mL

17 Uniformity Results For example: New irrigation systems: Field DU Should be > 75% Existing systems: If DU < 75% System should be repaired or adjusted. Existing systems: If DU < 60% System should be replaced.

18 DU as an Efficiency Measure It is not strictly a measure of efficiency. It is an Index Does it matter? (1)For communication and management – No. (2) For scientific analysis and water balance – Yes.

19 Soil TypeSprinkler Type Catch Can DULQ Soil Moisture at 12 cm DULQ Soil Moisture at 20 cm DULQ Sandy LoamRotor 57%75%77% Silty clay loam Rotor68%86%87% It is the distribution of water in the soil that is important !

20 Comment: DU as an Efficiency Measure Example – Low DU and High Efficiency System with poor uniformity, application depth less that that required to refill the root zone, all the water taken up by plant roots. It is High Efficiency! (By some measures)

21 RBG System Fix - Before Before DU LQ : 55% SC 25%: % extra water required.

22 RBG System Fix - After After DU LQ 79% SC 25% % extra water required

23 Measurement of Water Use All irrigated sites need to have dedicated water meters.. Central control and PC based systems, together with digital flow meters, provide comprehensive water use data.

24 Reporting Water Consumption 1. Volume totals – ML 2.Trends and Reference years - % change, higher, lower 3. Application Rates (ML/ha) compared to industry standard. * Greater exposure of Application Rates would be beneficial.

25 Water Use Reporting Water BudgetWater UsedWater Required

26 Water Use Reporting Water Budget - Average Water Used - Meter Water Required - Actual Inefficiency

27 Irrigation Index – Efficiency Indicator The Irrigation Index (Ii) What is: Water used relative to Water required (volume)?.

28 Reporting Water Use Performance Irrigation Index RBG Melbourne

29 Case Study Reserve Irrigation Report Richard Dilena City of Greater Geelong

30 Bakers Reserve, Geelong, Jan 2012

31 Bakers Reserve, Geelong, Jan 2013

32 Bakers Reserve, Geelong, Jan 2014

33 Bakers Reserve Irrigation Report

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37 Anakie Reserve Irrigation Report

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40 Sample: Irrrigated site report Richard Dilena, City of Greater Geelong Performance Parameters 1.Irrigation index 2.Irrigation efficiency 3.Visual assessment 4.% of water budget used

41 Sample: Irrrigated site report Richard Dilena, City of Greater Geelong

42 It is more than the water! What is the performance of the green space?

43 Benefits and Value of Irrigated Green Space (1) Social (2) Environmental (3) Economic

44 Physical Health Recreation - Green Space Active Recreation Passive Recreation

45 Identifying Services or Outcomes Provided. Example: Redleap Reserve, Whittlesea Social Benefits: “User hours or player hours” Services provided: AFL 11,500 Player hours Cricket 6,700 Player hours Total: 18,200 Player hours Water productivity: 3,600 player hours per ML

46 Exercise/Recreational Benefits Dept. Health, Vic. Boeing Reserve, City of Moonee Valley Stormwater development of site. Sporting ovals, baseball, grasslands, woodlands

47 Health Benefits from Green Space Physical health benefits: $400,000 (Approx.) per year Other health benefits Mental health: Reduction in stress levels. Social benefits: Social cohesion, Liveability, Reduced rates of violence. Environmental benefits: Urban heat island (UHI) mitigation

48 Cost Benefit Analysis – Green space Evaluated over 10 years Community benefit: $4 million (Approx.) Environmental benefit: $185,000 (Approx. Costs: $3 million (Approx.) Net benefit of green space: $0.8 million

49 RBG Melb. Irrigation Water Productivity 70 Litres per visitor. What is the $ value of the benefits? Photo: Jorge de Arujo, RBG

50 Efficiency Reference CSIRO Publishing Website: Water Use Efficiency For Irrigated Turf and Landscape Geoff Connellan

51 Summary 1.DU is a powerful measure – It describes the condition of the system and is an effective communication tool. 2. Irrigation Index (Ii) - Assesses irrigation management, scheduling and overall efficiency. 3. Precipitation rate (PR) is valuable in terms of application efficiency and also in gaining an understanding of the hydraulic performance of the system 4. Productivity measures, which assess the services of the green space, are becoming increasingly important as the value of green space is recognised.


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