Brookvale Oval Investigation - Warringah Council - NSW Government

4.1.8. Distribution Uniformity
The aim of an irrigation system should be to achieve the maximum output for
minimal input. The distribution uniformity (DU) of an irrigation system is a measure of the
systems efficiency.
This figure identifies how even the distribution of water is over the irrigated area.
To obtain this information a number of ‘catch can’ tests were carried out at the site
Catch can tests measures the precipitation rate and evenness of water application being
applied.
The results of the catch can test enable calculations to be made on the current efficiency
of the system and to make recommendations on improvements if necessary.
The results of these tests are detailed in Tables 2,3,4
Table 2: Zone 2 Data
Station 2 - Brookvale Oval
Row Timed Catch mm / hour each can
Total
Number
1 - 5.7 8.4 11.4 9.0 -
2 9.0 7.2 6.9 9.6 10.8 7.8
3 6.0 7.8 5.4 2.7 5.4 3.3
4 7.2 7.8 4.8 5.1 4.5 6.6
5 6.3 6.6 8.1 11.4 13.2 6.3
6 - 3.9 12.0 11.4 7.5 -
Totals 28.5 39.0 45.6 51.6 50.4 24.0 239.1
Average mm/hr precipitation 7.47
Sprinkler type:
Toro 640 hydraulic valve in head
Total catch cans 32
MAR (mean application rate) 7.47 mm / hour
DU (distribution uniformity) 59% (72% is the minimum industry standard
requirement for turf grass irrigation design)
Scheduling Coefficient
1.70 (1.5 is average however the closer to 1.0 the
better)
Operating Pressure
375kPa Average (450kpa operating pressure ideal)
Number of Sprinklers 4
● Irrigation Management Pty Ltd – ABN 92 116 740 160 ●
● Unit 9, 8 Millennium Court, Silverwater, NSW 2128 ●
● Phone: 02 9748 6178 ● Fax: 02 9748 6179 ●
● Web: www.irrigationmanagement.com.au
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