ENERGY EFFICIENT SOLUTIONS PTY LTD Tamborine Mountain Boring for Facts on Water Rainfall, water storage and useage 29 th May 2005 Tamborine Mountain Aerial Photo Ian Shephard BE MEngSc 94 Bartle Road Mount Tamborine

ENERGY EFFICIENT SOLUTIONS PTY LTD Preamble The following PowerPoint presentation was prepared for the Water Forum on the 29 th May 2005 sponsored by Tamborine Mountain Landcare. The analysis was based on the best available data and necessarily relies on some estimates based on other regions when Tamborine Mountain site specific data was not available in the public domain. Conservative estimates were adopted to ensure that the results of the study were robust.

ENERGY EFFICIENT SOLUTIONS PTY LTD The Earth’s water exists in the following locations: oceans 97.5% (saltwater) glaciers and ice caps 2% atmosphere 0.001% Only 2.5 per cent of the world's water is fresh, and the vast majority of that is frozen in glaciers and icecaps. Less than 1% of water is in the groundwater, lakes, and rivers All told, less than 0.3 per cent of the planet's fresh water is in the lakes and rivers. The Earth’s Water Resource ENERGY EFFICIENT SOLUTIONS PTY LTD

Australia’s Water Resource Total water use 24,000,000 Ml / year –Surface water 19,000,000 Ml / year –Ground water 5,000,000 Ml / year Irrigation 75 % Urban / Industrial 20% Rural 5% Equivalent to 1.2 Ml / person / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Australia’s Water Resource - Rainfall

ENERGY EFFICIENT SOLUTIONS PTY LTD Australia’s Water Resource - Groundwater

ENERGY EFFICIENT SOLUTIONS PTY LTD In a typical Australian household people use more than 270 litres of water a day. Gardening is responsible for up to half of the water used each day. Flushing toilets uses about another quarter. The SEQ Infrastructure Plan states that the current average residential water use across SEQ of 300 litres per day per person is to be reduced to 230 litres per day per person by 2020

ENERGY EFFICIENT SOLUTIONS PTY LTD Tamborine’s Water Resources No reticulated water supply No significant dams or weirs No run of river supply Tamborine relies on :- Rainfall / Household Rain Water tanks Ground Water Bores

ENERGY EFFICIENT SOLUTIONS PTY LTD Albert River

ENERGY EFFICIENT SOLUTIONS PTY LTD Ref. M Russell Tamborine Mountain Rainfall Isohyets

ENERGY EFFICIENT SOLUTIONS PTY LTD Fern Street Monthly Rainfall Ref. Aust BOM

ENERGY EFFICIENT SOLUTIONS PTY LTD Ref. DNR The Occurrence of Groundwater in South East Queensland

ENERGY EFFICIENT SOLUTIONS PTY LTD Mt Warning Volcano 23 million years ago RL 2000 m Tamborine Mountain RL 500 / 580 m Basalt cap ~100 to 200 m Ref. W Willmott

ENERGY EFFICIENT SOLUTIONS PTY LTD Ref. W Willmott RL to base of Basalt Cap Western edge~RL 300 Eagle Heights ~RL 400 Golf Course~RL 450 ~RL 500

ENERGY EFFICIENT SOLUTIONS PTY LTD Ref. W Willmott

ENERGY EFFICIENT SOLUTIONS PTY LTD Ref. W Willmott

ENERGY EFFICIENT SOLUTIONS PTY LTD Basalt Plateau Comparison AthertonTamborine Recharge Area (Km**2)10025 Elevation RL (m)600/ /580 Average Annual Rain (mm) Annual Pan Evaporation (mm) Annual Evapotranspiration (mm) Basalt Cap Thickness (m)50 to to 200 Conductivity (mS/cm)0.1 to to 0.2 Seasonal Water Table (m)6? Average Annual Recharge (%)15% to 33%? Suggests Ground Water Recharge for Tamborine of at least 15% Ref. CSIRO report Atherton Tablelands

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Tamborine Mountain Population and Houses Current Population ~ 6500 Current Residences~ 2750 Total existing FH lots> 3600 Potential Population ~ 9000 Potential No. Houses ~ 3750

ENERGY EFFICIENT SOLUTIONS PTY LTD Tamborine Mountain Groundwater Recharge Area Locality Total Area3300 ha Area above 450m2900 ha (7000 acres) Plateau Area1800 ha Adopt Recharge Area ~ 2500 ha ~ 6000 acres

ENERGY EFFICIENT SOLUTIONS PTY LTD Tamborine Mountain Agriculture Irrigation Areas DCP Planning study 1997 Total area of 210 ha 25% utilising irrigation Harrison Grierson Report 2001 Total area of 170 ha Adopt agriculture area ~ 200 ha ~ 500 acres

ENERGY EFFICIENT SOLUTIONS PTY LTD Domestic Water Use Household and Gardening Current Population 6500 Water 300 l/d/p and 150 l/d/p Annual Use 6500*300*365 = 710 Ml / year Annual Use 6500*150*365 = 355 Ml / year Future Population 9000 Water 230 l/d/p and 150 l/d/p Annual Use 9000*230*365 = 755 Ml / year Annual Use 9000*150*365 = 500 Ml / year Note. Gardening is responsible for up to half of the water used each day

ENERGY EFFICIENT SOLUTIONS PTY LTD Domestic Water Use Household and Gardening Water Use on the previous slide is a conservative figure for Tamborine and is based on the current and planned future SEQ daily useage from reticulated water supply and includes gardening. Tamborine Water Use from household water tanks would generally be expected to be around half the general SEQ useage ( 150 l/d/p ) This lower useage rate HAS NOT BEEN USED for this water balance. Adopt conservative useage of 750 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Household Rain Water tanks Current Population 6500 / Houses Houses / 250 sq m / 1.55 m rain / 33% yield Annual secure rain water supply 350 Ml / year Future Population 9000 / Houses Houses / 250 sq. m /1.55 m rain / 33% yield Annual secure rain water supply 500 Ml / year Adopt conservative supply of 500 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Rainwater Tank Sizing Volume of water needed –Number of people –Average consumption per person –Range of uses –Conservation measures Rainfall records Area of roof catchment Security of supply ( back up source ?) Determine Tank Size

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Beaudesert Shire Council Computer Simulation Model - INPUT

ENERGY EFFICIENT SOLUTIONS PTY LTD Beaudesert Shire Council – Model Results

ENERGY EFFICIENT SOLUTIONS PTY LTD Beaudesert Shire Council – Model Results

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2004 Rainfall at 94 Bartle Road Fern Street Monthly Rainfall Ref. Aust BOM

ENERGY EFFICIENT SOLUTIONS PTY LTD Beaudesert Shire Council – Model Results

ENERGY EFFICIENT SOLUTIONS PTY LTD Bore Water Supply Total of 800 plus bores currently on Tamborine Mountain –Average 60 m deep (200 feet) –Some as deep as 150m (500 feet) –Not all bores were successful –Not all bores are currently active Approx. 100 bores used predominantly for agriculture irrigation, domestic water carriers and off mountain water supply Approx. 500 bores used predominantly for supplementing domestic rain water tanks and for gardens.

ENERGY EFFICIENT SOLUTIONS PTY LTD Bore Water Supply - Agriculture 100 bores used predominantly for agriculture irrigation and water supply Typical capacity 1litre / second (800 gph) Typical capacity factor 17% maximum ( 4 hr / day) Total bore water pumped from 100 bores 100*3600*24*365*0.17 = 500 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD 500 bores used predominantly to supplement domestic rain water tanks and for gardens. Typical capacity litre / second (220 gph) Typical capacity factor 5% maximum (1+ hr / day) Total bore water pumped from 500 bores 500*0.275*3600*24*365*0.05 = 220 Ml / year Bore Water Supply – Domestic & Gardens

ENERGY EFFICIENT SOLUTIONS PTY LTD Bore Water for Off Tamborine Supply Hartley Road20 / week Holt Road 6 / week Curtis Road 6 / week Power Parade 2 / week Bateke Road 1 / week St. Bernard Street 1 / week Siganto Street ? Prospect Street ? Average of 36 loads per week 36 * 52 * litre = 50 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Bore Water for Domestic Carriers 3 Domestic Water Carriers Operate 6+ days per week Up to 12 loads per day typical Typical load litre Do not operate at full capacity all year Adopt 8 months (April – November) 3 * 6 * 12 * litre * 35 weeks = 90 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Agriculture Irrigation Water Use Agriculture area of 200 ha 33 % of area utilising irrigation 500 mm of irrigation water per year Equivalent to 10 mm every week Equivalent to 5 Ml / ha / year Total Agriculture Irrigation useage 330 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Domestic Bore Water Use Supplementing rain water tank supply Assume 500 active domestic bores Assume 3 tank refills per house –50 Ml / year 500 mm of garden water per year Equivalent to 10 mm every week Assume Garden / lawn area of 40 ha –200 Ml / year Total domestic bore water useage 250 Ml / year

ENERGY EFFICIENT SOLUTIONS PTY LTD Estimated Water Balance Tamborine Mtn mm rainfall (2500 ha) Ml100% 750 mm evapotranspiration Ml 48.5% Surface run-off to creeks Ml 35% 15% groundwater recharge Ml 15% 15% recharge is an estimate based on the Atherton Study in the absense of data specific to Mount Tamborine Household rain water tanks >500 Ml>1.3%

ENERGY EFFICIENT SOLUTIONS PTY LTD Estimated Groundwater Balance Tamborine Mountain 15% groundwater recharge Ml100% 15% recharge is an estimate based on the Atherton Study in the absence of data specific to Mount Tamborine Exported off Tamborine 50 Ml 0.9% Bore water - domestic carriers 90 Ml 1.5% Bore water - agriculture irrigation 330 Ml 5.7% Bore water - domestic & gardens 250 Ml 4.3% Total groundwater extraction 720 Ml 12.5% Net groundwater extraction approx.10%

ENERGY EFFICIENT SOLUTIONS PTY LTD Estimated Groundwater Storage Tamborine Mountain Basalt Cap adopt 150m thick over 2500 ha Basalt effective porosity typically 3% to 50% Basalt effective porosity Atherton 5% to 20% Adopt effective porosity 5% for Tamborine Basalts Groundwater storage in Basalts –150m * 2500ha * 5% = Ml –Equivalent to 32 years of average annual recharge –Equivalent to 260 years of current annual extraction

ENERGY EFFICIENT SOLUTIONS PTY LTD Boring for Facts on Water Rain water tanks generally meet household demands supplemented with domestic bore water supply or bore water delivery Agriculture irrigation demands are decreasing Garden water supply demands are increasing Bore water supply for supplementing domestic and off Mount Tamborine uses are sustainable Low water demand native gardens should be encouraged Conservation of water should be encouraged

ENERGY EFFICIENT SOLUTIONS PTY LTD Boring for Facts on Water Where to now? Have good rainfall data No data on stream flows May need stream flow monitoring Little data on bores Need background watertable monitoring Need Tamborine specific data on ground water recharge to confirm adopted recharge rate of 15% Need data on existing bore useage to confirm irrigation, supplementary domestic and gardening demands

ENERGY EFFICIENT SOLUTIONS PTY LTD