Design note 3 - Appendix B: Selection of Rainfall Templates

Two climate regions were identified within the City. A 10  year and a 20 year climate template was prepared for each of these.

The rainfall periods were infilled using data from other stations to create ‘patched point’ rainfall data sets and have less accumulated and missing data than the original data sets. The method was based on that used by SILO (Jeffrey, 2001) modified for 6 minute rainfall data. The following was then considered to select the periods recommended below in Table 8:

  • Rainfall quantity – Mean annual rainfall from all nearby daily rainfall gauges
  • Data integrity – Percentages of missing and accumulated data
  • Rainfall variation – Rainfall percentiles similar to those for reference daily gauges

Table 8 : Rainfall templates for City of Greater Geelong.

Rainfall band Rainfall station Period Mean annual rainfall (millimetres) Evapo-transpiration percentage accumulated percentage missing

more than 500 millimetres

087133 Geelong North

1974-1983

526

1,217

1

1

more than 500 millimetres

087133 Geelong North

1971-1990

531

1,217

1

1

less than 500 millimetres

087033 Little River

1992-2001

485

1,217

5

5

less than 500 millimetres

087033 Little River

1989-2008

464

1,217

5

5


Monthly evapotranspiration values were adopted based on the templates from MUSIC for North Geelong and Little River respectively and are included in the climate templates.


Next section: Appendix C - When is a Bioretention Asset Appropriate?

Previous section: Appendix A: Stage-Storage-Dsicharge Relationship

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Page last updated: Wednesday, 18 December 2019

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