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A number of options are available to reduce this shortfall in water supply. The options available consist of:
1. Increase supply by increasing runoff catchment area
2. Decrease demand by supplying non-potable use from other sources; and
3. Combinations of 1 and 2.
The connection of the communal dining hall roof area to supplement the catchment for village 1 would provide an
additional 3,200m2 for collecting rainwater inflow to offset demand. This will need to be piped up to 200m to
connect these catchments, however as shown in Figure 5-2, this results in there being enough rainwater stored for
4 months of the year. The remaining 5.2ML of water required to be imported to site via water tanker service across
the year.
BOM - Site ID 040908 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average days/month 31 28 31 30 31 30 31 31 30 31 30 31
Mean rainfall (mm) for years 1996 to 2022 146.4 162.6 176.7 128.6 126.2 100.6 58.2 26.4 29.2 82.1 78.3 133.0
Generated RO/month 1,512,194.97 1,679,528.02 1,825,169.75 1,328,335.20 1,303,545.12 1,039,117.58 601,159.47 272,690.90 301,612.66 848,027.37 808,776.41 1,373,783.68
Demand/month 1,537,600.00 1,388,800.00 1,537,600.00 1,488,000.00 1,537,600.00 1,488,000.00 1,537,600.00 1,537,600.00 1,488,000.00 1,537,600.00 1,488,000.00 1,537,600.00
Surplus/deficient -25,405.03 290,728.02 287,569.75 -159,664.80 -234,054.88 -448,882.42 -936,440.53 -1,264,909.10 -1,186,387.34 -689,572.63 -679,223.59 -163,816.32
Storage 0.00 290,728.02 578,297.76 418,632.96 184,578.07 -264,304.35 0.00 0.00 0.00 0.00 0.00 0.00
Surplus/deficient -25,405.03 290,728.02 578,297.76 418,632.96 184,578.07 -264,304.35 -936,440.53 -1,264,909.10 -1,186,387.34 -689,572.63 -679,223.59 -163,816.32
DWG ID Area (m2)
Village 1 2372.19987
Village 2 3092.70257
Village 3 1630.98504
Communal dining hall 3233.31311
10,329.20
No. EP 160
Drinking water AD/ day 36.8
Non-drinking water AD/ day 12.8
Water Demand (kL) / day 49.6
Figure 5-2 - Option 1 Water Supply and Demand
Option 2 would involve the utilisation of the large 100 Acre dam, which is currently used to irrigate the site as well
as several site bores that may potentially be used to supply non-potable water demands generated by the facility
to reduce the drawdown of the clean, captured roof run-off allowing it to be used principally for potable water
supply. Based on the SEQ Code and excluding non-potable water demands, the potable water demand per EP is
150L/day.
Option 2 has been modelled in Figure 5-3 using the following parameters:
• Site occupancy of 80%: A 100% occupancy rate does not reflect the actual operation of the site with an
80% occupancy rate considered more appropriate (i.e. average duration of persons utilising the site is
approximately 5.5 days per week).
• Communal dining is excluded: There is significant distance between this storage point and the villages end
of line connection. Whilst this is a worthwhile option to consider as a redundancy in storage capacity, the
modelling has been based on a gravity based potable water storage adjacent to the village.
• Empty tanks: The tanks are assumed to be empty at the commencement of modelling.
BOM - Site ID 040908 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average days/month 31 28 31 30 31 30 31 31 30 31 30 31
Mean rainfall (mm) for years 1996 to 2022 146.4 162.6 176.7 128.6 126.2 100.6 58.2 26.4 29.2 82.1 78.3 133.0
Village 1 Storage size
Generated RO/month 347,290.06 385,719.70 419,167.72 305,064.90 299,371.62 238,643.31 138,062.03 62,626.08 69,268.24 194,757.61 185,743.25 315,502.58
Demand/month 279,000.00 252,000.00 279,000.00 270,000.00 279,000.00 270,000.00 279,000.00 279,000.00 270,000.00 279,000.00 270,000.00 279,000.00
Surplus/deficient 68,290.06 133,719.70 140,167.72 35,064.90 20,371.62 - 31,356.69 - 140,937.97 - 216,373.92 - 200,731.76 - 84,242.39 - 84,256.75 36,502.58 350 KL
Storage 68,290.06 202,009.76 342,177.48 350,000.00 350,000.00 318,643.31 177,705.34 - - - - 36,502.58
Imported Water - - - - - - - - 38,668.58 - 200,731.76 - 84,242.39 - 84,256.75 -
Village 2 Storage size
Generated RO/month 452,771.66 502,873.44 546,480.54 397,721.55 390,299.06 311,125.88 179,995.29 81,647.35 90,306.91 253,910.88 242,158.61 411,329.44
Demand/month 200,880.00 181,440.00 200,880.00 194,400.00 200,880.00 194,400.00 200,880.00 200,880.00 194,400.00 200,880.00 194,400.00 200,880.00
Surplus/deficient 251,891.66 321,433.44 345,600.54 203,321.55 189,419.06 116,725.88 - 20,884.71 - 119,232.65 - 104,093.09 53,030.88 47,758.61 210,449.44 250 KL
Storage 250,000.00 250,000.00 250,000.00 250,000.00 250,000.00 250,000.00 229,115.29 109,882.64 5,789.55 58,820.43 106,579.04 210,449.44
Imported Water - - - - - - - - - - - -
Village 3 Storage size
Generated RO/month 238,776.21 265,198.17 288,195.06 209,744.68 205,830.31 164,077.10 94,923.33 43,058.01 47,624.76 133,903.87 127,706.13 216,921.01
Demand/month 119,040.00 107,520.00 119,040.00 115,200.00 119,040.00 115,200.00 119,040.00 119,040.00 115,200.00 119,040.00 115,200.00 119,040.00
Surplus/deficient 119,736.21 157,678.17 169,155.06 94,544.68 86,790.31 48,877.10 - 24,116.67 - 75,981.99 - 67,575.24 14,863.87 12,506.13 97,881.01 175 KL
Storage 119,736.21 175,000.00 175,000.00 175,000.00 175,000.00 175,000.00 150,883.33 74,901.33 7,326.10 22,189.97 34,696.10 132,577.11
Imported Water - - 169,155.06 94,544.68 86,790.31 48,877.10 - - - - - -
Figure 5-3 - Option 2 Water Supply and Demand per Village
Project number 20220146 Page 15 of 20
File RECOR Stormwater Management Plan- 20220146.docx, 2022-09-06 Revision 0
P +61 7 5211 1003 A 37 Mary St, Noosaville Qld 4566 E [email protected] recorconsulting.com
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