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Tamborine Mountain Boring for Facts on Water Rainfall, water storage and useage 29 th May 2005 PowerPoint Presentation
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Tamborine Mountain Boring for Facts on Water Rainfall, water storage and useage 29 th May 2005. Tamborine Mountain - 2002 Aerial Photo. Ian Shephard BE MEngSc 94 Bartle Road Mount Tamborine 07 55450481 isheps@tpg.com.au. Preamble.

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slide1

Tamborine Mountain

Boring for Facts on Water

Rainfall, water storage and useage

29th May 2005

Tamborine Mountain - 2002 Aerial Photo

Ian Shephard BE MEngSc

94 Bartle Road

Mount Tamborine

07 55450481

isheps@tpg.com.au

preamble
Preamble

The following PowerPoint presentation was prepared for the Water Forum on the 29th 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.

slide3

The Earth’s Water Resource

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.

ENERGY EFFICIENT SOLUTIONS PTY LTD

australia s water resource
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
slide7

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

tamborine s water resources
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
slide13

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

slide14

RL to base of Basalt Cap

Western edge ~RL 300

Eagle Heights ~RL 400

Golf Course ~RL 450

~RL 500

Ref. W Willmott

basalt plateau comparison
Basalt Plateau Comparison

Atherton Tamborine

Recharge Area (Km**2) 100 25

Elevation RL (m) 600/1000 500/580

Average Annual Rain (mm) 1650 1550

Annual Pan Evaporation (mm) 1800 1600

Annual Evapotranspiration (mm) 1000 750

Basalt Cap Thickness (m) 50 to100 100 to 200

Conductivity (mS/cm) 0.1 to 0.2 0.1 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

slide19

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

slide20

Tamborine MountainGroundwater Recharge AreaLocality Total Area 3300 haArea above 450m 2900 ha (7000 acres)Plateau Area 1800 haAdopt Recharge Area ~ 2500 ha ~ 6000 acres

slide21

Tamborine MountainAgriculture Irrigation AreasDCP Planning study 1997 Total area of 210 ha 25% utilising irrigationHarrison Grierson Report 2001 Total area of 170 ha

Adopt agriculture area ~ 200 ha ~ 500 acres

domestic water use household and gardening
Domestic Water UseHousehold and Gardening

Current Population 6500

  • Water Use @ 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 Use @ 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

domestic water use household and gardening23
Domestic Water UseHousehold 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

slide24

Household Rain Water tanks

  • Current Population 6500 / Houses 2750
  • 2750 Houses / 250 sq m / 1.55 m rain / 33% yield
  • Annual secure rain water supply 350 Ml / year
  • Future Population 9000 / Houses 3750
  • 3750 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
rainwater tank sizing
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
slide27

Beaudesert Shire Council

Computer Simulation Model - INPUT

slide33

2004 Rainfall at 94 Bartle Road

Fern Street Monthly Rainfall

Ref. Aust BOM

bore water supply
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.
bore water supply agriculture
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

slide37

Bore Water Supply – Domestic & Gardens

500 bores used predominantly to supplement domestic rain water tanks and for gardens.

  • Typical capacity 0.275 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 for off tamborine supply
Bore Water for Off Tamborine Supply
  • Hartley Road 20 / week
  • Holt Road 6 / week
  • Curtis Road 6 / week
  • Power Parade 2 / week
  • Bateke Road 1 / week
  • St. Bernard Street (2@1/2) 1 / week
  • Siganto Street ?
  • Prospect Street ?

Average of 36 loads per week

36 * 52 * 28000 litre = 50 Ml / year

bore water for domestic carriers
Bore Water for Domestic Carriers

3 Domestic Water Carriers

  • Operate 6+ days per week
  • Up to 12 loads per day typical
  • Typical load 12000 litre
  • Do not operate at full capacity all year
  • Adopt 8 months (April – November)

3 * 6 * 12 * 12000 litre * 35 weeks = 90 Ml / year

agriculture irrigation water use
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

domestic bore water use supplementing rain water tank supply
Domestic Bore Water UseSupplementing 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

estimated water balance tamborine mtn
Estimated Water Balance Tamborine Mtn.

1550 mm rainfall (2500 ha) 38 750 Ml 100%

750 mm evapotranspiration 18 750 Ml 48.5%

Surface run-off to creeks 13 650 Ml 35%

15% groundwater recharge 5 800 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%

estimated groundwater balance tamborine mountain
Estimated Groundwater Balance Tamborine Mountain

15% groundwater recharge 5 800 Ml 100%

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%

estimated groundwater storage tamborine mountain
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% = 187 500 Ml
    • Equivalent to 32 years of average annual recharge
    • Equivalent to 260 years of current annual extraction
boring for facts on water
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
boring for facts on water where to now
Boring for Facts on WaterWhere 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