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?
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