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Attachment 4 - Stormwater Managment Plan
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Log in to see the plans as drawn4.2. ROOF STORMWATER HARVESTING
In order to calculate the optimal size of the underground retention tank/s and the volume of
stormwater that actually falls onto the roofed areas; a review of the Bureau of Meteorology
(BOM) historical daily rainfall data is undertaken, refer Figure 3 + 4 below. These tables identify
that over the past 26 years the mean number of days per year that equal or exceed 25mm of
daily rainfall is 17.7 days. The site retention tanks have been designed to cater for double this at
50mm of daily rainfall, which will total 40 kL minimum of water storage.
Figure 3; BOM Climate Statistics for the closest weather station- Tewantin RSL Park.
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TMC Building Design Group
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