SOUTHEAST TASMANIA GROUNDWATER MAP · 700 600 500 100 100 200 200 200 400 500 700 100 100 100 100...
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MAINGON BAY MARION WEDGE BAY OYSTER Slaughterhouse Bay Riedle Bay MERCURY PASSAGE BAY STORM FREDERICK HENRY Two Island Bay Raoul Bay ADVENTURE BAY Esperance Port Cape Bay Boreel Head Mangana Bluff FLUTED CAPE TASMAN HEAD CAPE BRUNY Cloudy Head West Menzies Bluff SOUTH EAST CAPE Soldier Bluff Fishers Pt Eliza Pt Scott Pt QUEEN ELIZABETH Variety Pt Head CAPE DIRECTION CONTRARIETY CAPE DESLACS Mays Pt Primrose Point Deer Pt Ironstone NORTH HEAD Point WEST West Arthur Thumbs Pt Salters Pt Fulham Point CAPE PERON CAPE BERNIER CAPE MAUROUARD Quarry Pt Pt Home Lookout CAPE BOUGAINVILLE Middle Bluff Grindstone Pt Boags Pt Buxton Pt Webber Pt Hepburn Pt CAPE FAURE CAPE SONNERAT CAPE BAUDIN CAPE FORESTIER CAPE TOURVILLE CAPE DEGERANDO Gates Bluff Friendly Pt Cape Lodi Peggys Pt Long Point CAPE CAPE Pt Baily CAPE BOULLANGER MISTAKEN CAPE HAUY PILLAR CAPE DE LA SORTIE The Yellow CAPE RAOUL Head Cape Connella Little Raggedy Pt Cecil Shoemaker Point SOUTH CAPE Lookout Pt Second Southport Bluff Hopwood Point Ventenat Pt Chuckle CAPE Bluff HEAD OUTER NORTH CAPE Lesueur Pt Johnsons Pt Head Weatherhead Pt Butlers Pt POINT LAUDERDALE HUONVILLE GLENORCHY Dover Geeveston Port Huon Cradoc Cygnet Franklin Cremorne Lewisham Copping Murdunna Taranna Dunalley Koonya Nubeena Richmond Colebrook Tunnack Ross Coles Bay Bagdad Mangalore Pontville Brighton Maydena Westerway Lachlan Collinsvale Granton Fern Tree Sandfly Waddamana Liawenee Breona Tunbridge Oatlands Kempton Hamilton Bothwell Ouse BRIDGEWATER Bicheno Orford Triabunna Avoca Buckland Woodsdale Gretna Bushy Natio n a l P ark Ellendale Eaglehawk Neck Glen Huon KINGSTON Margate Snug Kettering Barnes Bay Woodbridge Middleton Adventure Bay Alonnah Southport Hastings Port Arthur Forcett SORELL MIDWAY Sands Primrose SOUTH ARM NEW Swansea Shelly Pt NORFOLK Park Macquarie Plains Grove Longley Campania Orielton Parattah Town Campbell Conara Epping Forest Poatina Miena BAKERS TIER THE HAZARDS MT BOBS MOUNT LA PEROUSE HARTZ MTNS MOONLIGHT RIDGE BRUNY RANGE WELLINGTON RANGE MEEHAN RANGE RODWAY RANGE MACQUARIE TIER GAVINS TIER BADAJOS TIER WINGYS TIER PARRAMORES TIER RATS CASTLE HUMMOCKY HILLS O’CONNERS PEAK PENNY MT MT THUNDERBOLT DEN HILL TABLE MTN MT FIELD MT DROMEDARY MT STYX MT PICTON MOUNT HOPETOUN PRECIPITOUS BLUFF ADAMSONS PEAK HARTZ PEAK MT MISERY GREY MTN MT CYGNET MT BRUNY MT FORESTIER BROWN MTN BUTLERS HILL MT MARIA THE QUOIN MT GRAHAM MT FREYCINET GREAT WESTERN TIERS TIER BARREN BELLEVUE TIER TIER DIAMOND KNIGHTS LO SHAN N O N T I E R SCOTT S TIE R WILD D O G T IE R BRADYS SL L A N E S T IER N A T I V E T I E R BRADYS LO TAYLORS TIER BLACK TIER MARSHALLS T IE R BLUESTONE TIER TASMAN HIGHWAY HILL SNOW MIILERS BLUFF MT FRANKLIN WOODS SEYMOUR QUOIN SPODE MT MT WEST EAST FIELD BLACK TIER MAYDENA RANGE MIDLAND HWY TATNELLS HILL SOU T H P I C TO N R A N G E TAYLORS RIDGE RANGE WELLINGTON SOUT H C A P E R A N G E MT RAOUL MT LLOYD MT WELD SNOWY SNOWY RANGE SOUTH NORTH SNOWY SNOWY R A N G E LAKE QUOIN Melton Mowbray MTN MT HWY TOOMS MT HUON RIVER RIVER OUSE RIVER LAKE LAGOON OF ISLANDS RIVER LAKE LEAKE TIBERIAS RIVER DERWENT RIVER DERWENT GREAT LAKE ARTHURS LAKE LAKE ECHO Ouse WOODS Clyde LAKE SORELL LAKE CRESCENT LAKE River RIVER CLYDE River West Swan River River Elizabeth Little RIVER JORDAN TYENNA RIVER STYX RIVER Shannon River PICTON RIVER H U O N RIVER HUON WELD RIVER PLENTY RIVER St Pauls River Swan River RIVER ESK MACQUARIE RIVER LAKE Jordan Coal River Prosser River River Swanport LAKE TOOMS Macquarie River River NEW RIVER Taylors Great Bay Southport MT MANGANA Osterley TASMAN SEA HOBART MT RUMNEY MT WELLINGTON Bay B a r n es KERMANDIE DIVIDE D ’ E N T R E C A S TE A U X BAY MUNRO BIGHT HENDRICK CAPE FREDERICK YELLOW CAPE SURVILLE HIGH BLUFF CAPE PAUL LAMANON SEVEN MILE BEACH Dodges Ferry Spectacle Head RIVER DERWENT 170 150 175 155 180 150 185 160 155 5500 5000 500 4000 3500 3000 1000 2500 2000 1500 500000mE 550000mE 600000mE 650000mE 5150000mN 5200000mN 5250000mN 5300000mN 5350000mN 500000mE 550000mE 600000mE 650000mE 5150000mN 5200000mN 5250000mN 5300000mN 5350000mN Tasmania MINERAL RESOURCES TASMANIA SOUTHEAST TASMANIA GROUNDWATER MAP DEPARTMENT of INFRASTRUCTURE ENERGY and RESOURCES POROUS (INTERGRANULAR) PERCENT IRRIGATION SUCCESSFUL (YIELD >=1.5) NUMBER OF BORES ROCK GROUPS AQUIFER TYPE 20 75 8.3 0.52 (12) These aquifers are contained in surface deposits of limited thickness. Yields depend on grain size, clay content and saturated thickness. There Quality is variable and salt content may limit uses in some areas. Aquifers are unconfined to confined. These aquifers are contained in surface deposits of limited thickness. Yields in alluvium are variable and often low due to a relatively high clay content. However, where the sediments are coarse grained and free of in such situations are usually poor. In the areas where these units are present, there are often good prospects of obtaining groundwater from underlying materials. Many successful bores penetrate these surface deposits and obtain water from underlying rocks. In many cases the underlying rock will be that which surrounds these deposits at the surface. Water quality in the coarser sediments is often good. Nearby surface streams may recharge them. Aquifers are unconfined to confined. The major areas where these sediments occur are the southern part of the Launceston Tertiary Basin from Campbell Town to Epping and the Coal River Valley region where prospectivity is high and groundwater is stored in fine to medium grained sand, coarse sand and gravel. Water quality is variable in these deposits and salinity often reaches levels that seriously limit use. The high average yield of successful bores reflects operations. Particularly low prospective areas include the Penna area, Cranbrook (where 11 bores failed to obtain useful water in clay sediments Development of bores in these sediments, particularly where the aquifers are fine to medium grained sand require specialist drilling skills to establish reliable operating bores. Aquifers are often confined and occasionally unconfined. Aquifers are mainly unconfined to confined locally. Only a few bores have been drilled in these rock types in the region and results are not regarded as particularly representative. Three bores have Aquifers are semiconfined to confined and occasionally unconfined. yielding bores. Particularly prospective areas are the Campbell Town and Pawleena Road (near Sorell) areas. Excessive use in these areas could result in restrictions on use being applied because they are both low rainfall (and hence low recharge) areas. Storage per unit volume can be greater in basalt than some other fractured rock units because of the presence of vesicles (gas holes) and the generally more intense fracturing system. Quality is variable and salinity is often moderate to high which restricts use. Aquifers are mainly confined to unconfined locally. Jurassic dolerite is usually less fractured than Tertiary basalt and as a result has lower prospectivity at most locations. The proportion of successful bores is lower than the Permian / Triassic and Tertiary basalt units but average output of those that are successful is relatively high. successful bores. Quality is variable and salinity in low rainfall areas is often at levels that restrict use. Aquifers are often unconfined, semiconfined to confined. Only a few bores have been drilled in these rocks in the region and results are not regarded as particularly representative. Although the four bores reported all obtained water, this is a much greater percentage success rate than bores attempted in these rocks outside the area where many more bores have been drilled. Granitic rocks are generally less fractured than most other rock types, resulting in generally lower yields and success rates for water bores. Aquifers are unconfined to confined. POROUS (INTERGRANULAR) POROUS (INTERGRANULAR) LOW - MODERATE POROUS (INTERGRANULAR) FRACTURED ROCK (Intergranular on some horizons) FRACTURED ROCK Tertiary basalt. MODERATE FRACTURED ROCK FRACTURED ROCK Quaternary coastal plain deposits consisting of sand, clayey sand, and gravel, underlying areas near the coast. Probable marine origin. Quaternary, alluvium talus and till deposits. The talus consists of boulders with a moderate to high clay content. 46 43.5 0.31 (17) 0.63 34 61.8 0.77 (18) 5.5 5.05 FRACTURED ROCK 138 52.9 15.17 535 - 5800 1.56 (60) 1787 116 - 13790 19.1 25.3 78 Cambrian and Precambrian rocks in southwest. 16.7 100 3.78 3.78 (1) 6 181 81.8 3.25 (140) 25.25 40.7 560 - 8390 100 1.01 63.1 19.8 70 - 11200 18.95 1.24 (293) 480 4 0.60 (4) HIGH HIGH MODERATE - HIGH HIGH PROSPECTIVITY (Whole of Tasmania) LOW - MODERATE MODERATE- HIGH (Low on this map) Tertiary sediments consisting of clay, sand and gravel. Variable thickness up to several hundred metres. Lacustrine and alluvial sediments. Minor windblown sand on sloping bedrock. Terrestrial origin. the coarser grained units (sandstone, conglomerate). Transmission of water to bores is probably largely via joints and bedding planes. Triassic and Permian rocks are mainly regarded as fractured rock aquifers although there is likely to be some intergranular storage and flow in been drilled in each rock group on single properties at closely spaced locations. The grading of the prospectivity refers to known results in these Tertiary basalt is the most prospective rock unit in the region. It has the highest success rate for bores drilled as well as a high proportion of higher Jurassic dolerite. Minor Cretaceous syenite and Cambrian and Precambrian rocks and Tertiary basalts (Bream Creek area). 1. Statistics provided in the legend are based on deep boreholes entered in MRT groundwater database (BORIS) by February 2003. Boreholes shown on the map are those with locations mainly supplied by drillers and from location in the field by MRT staff. 1.23 (1316) GENERAL AQUIFER CHARACTERISTICS These aquifers are contained in surface deposits of limited thickness up to a maximum of about 12 metres but usually less. Yield depends on grain size and thickness of saturated sand and decreases as the clay content of the sand increases. Groundwater is often extracted from these Aquifers are mostly unconfined. Quaternary aeolian deposits marginal to the coast consisting of fine to medium grain size sand. These rocks are the most commonly drilled in the region. Yields range up to irrigation quantities and groundwater is used for domestic, garden, stock and irrigation purposes. Ordovician to Devonian turbidite sequence of sandstone and mudstone (Mathinna Supergroup). rock units outside the area covered by this map where large numbers of bores have been drilled with much better results. Mathinna Supergroup rocks are one of the more prospective units for groundwater in the State. 6. In areas where there is little or no water bore data, the groundwater prospectivity has been assumed to be similar to that in the areas where data are widely available. 4. There are many spear bores installed for investigation and production purposes in coastal sand deposits in Tasmania. Salinity 210 - 5000 1840 - 11200 210 - 8290 The alluvium consists of clay, together with sand and gravel deposits with varying clay content. LOW - HIGH Talus and windblown sand are often in elevated locations on the side of steep slopes and prospects of appreciable quantities of groundwater Quality is variable and salinity restricts use at many locations. Near surface lower yielding zones often have poorer quality groundwater than 1700 Outputs of bores are those supplied by drillers and are mostly the result of short term pumping measurements. Some bores have been successful, but outputs have not been reported. These bores are included in the total percentage of successful bores but have not been used for other statistical calculations. Boreholes reported as dry holes usually have a small unreported SALINITY RANGE (mg/L) PERCENTAGE SUCCESSFUL (YIELD >0.03) 3.78 MAXIMUM YIELD (L/s) AVERAGE YIELD (L/s) # sufficient for domestic, garden, stock. A nest of 10-20 spears using a central pump may yield small irrigation quantities (5-10 L/s). Quality is often good enough for the water to be used for a wide range of purposes. Major resources occur in sand deposits behind Nine Mile Yields of up to about 20 L/s have been obtained (irrigation quantities) and domestic / stock / garden quantities are commonly obtained in the yield (<0.05 L/s). 2. # Boreholes with yields >0.03 L/s have been considered as successful bores. Yield related statistics (average, maximum yield and percent irrigation successful) are based on the number of successful bores (numbers in brackets in the average yield column). 3. Successful bores with a reported yield of >= 1.5 L/s have potential for small irrigation purposes. Very limited irrigation is possible with lower yields. 43.3 Triassic sandstone (lithic and quartz), mudstone, minor coal, terrestrial origin. Permian mudstone, siltstone, sandstone (often pebbly), minor limestone and conglomerate. Mainly marine origin, glacial conditions, minor zones of terrestrial origin. Devonian granitic rocks. 5. Small elevated areas of any hydrogeolgical unit will usually have lower prospectivity because of limited storage and high drainage rates. aquifers using spear bores installed to depths of up to 7-8 metres. A single spear in some prospective areas may yield 0.5 L/s or more i.e. clay, yields can be appreciable e.g. Melrose Road, Tunbridge where the reported output of a bore is 5.1 L/s. to 200 metres depth) and Little Swanport (4 bores obtained no useful supplies in clay sediments). Beach north of Swansea and at Seven Mile Beach. Significant resources occur at other locations e.g. Safety Cove, South Arm peninsula, Bruny Is. are few known high yielding zones in the region but it is often possible to extract small quantities of groundwater using spear bores e.g. South Arm peninsula. deeper higher yielding zones. High sulphate groundwater occurs in the Permian at some locations e.g. just north of central Tunnack. Triassic likely to be less prospective than lower lying locations in most cases. rocks at Dodges Ferry are particularly prospective but water quality limits use in some locations. Elevated and / or steeply sloping areas are High. VULNERABILITY TO POLLUTION Low to moderate. Can be higher if localised highly fractured zones are not covered by a layer of lower permeability material. Moderate. Can be high if highly fractured zones are not overlain by low permeability material. High. A thick layer of low permeability material covering the aquifer will reduce vulnerability. High. Low permeability material at the surface will offer some protection and vulnerability may be reduced to low to moderate. Low (Generally clay layers overlie the aquifers in most cases). Moderate to high. Depends on whether low permeability material overlies the aquifer. Low to high. Clayey material at the surface will aid in protecting groundwater at depth including underlying rocks. Coarse-grained aquifers without such protection are vulnerable as are aquifers underlying them. High. Very occasionally deep clay soils may offer some protection and lower vulnerability the results from the Campbell Town - Epping area. Smaller areas of Tertiary sediments have provided very mixed results from water boring ranges for some of the Quaternary aquifers in south-east Tasmania have been obtained from these borehole records and included in the legend (marked with a star ). 7. The southeast part of the state that this map covers includes a major portion of the State that has low rainfall / high evaporation and which is subject to soil salinity problems. Low rainfall / high evaporation is also probably the cause of the relatively poor quality of groundwater at many locations in the region. 170 Potentiometric contours of deeper Tertiary Aquifers (5 m contour interval) Longford Area (Geological Bulletin 59) 1500 Salinity contours of deeper Tertiary Aquifers (500 mg/L contour interval) Longford Area (Geological Bulletin 59) While every care has been taken in the preparation of this data, no warranty is given as to the correctness of the information and no liability is accepted for any statement or opinion or for any error or omission. No reader should act or fail to act on the basis of any material contained herein. Readers should consult professional advisers. As a result the Crown in Right of the State of Tasmania and its employees, contractors and agents expressly disclaim all and any liability (including all liability from or attributable to any negligent or wrongful act or omission) to any persons whatsoever in respect of anything done or omitted to be done by any such person in reliance whether in whole or in part upon any of the material in this data. Crown copyright reserved. The rainfall map shows the mean annual rainfall over Tasmania for the standard 30-year period from 1961 to 1990. It was derived by the Climate and Consultancy Section in the Tasmania and Antarctica Regional Office of the Bureau of Meteorology, from a gridded analysis prepared by the Bureau’s National Climate Centre. The analysis system blends measured rainfall with topography to give estimates of rainfall for each area. The results will be less accurate in mountainous or data-sparse regions, and may differ from the observations at individual locations. NORTHEAST SOUTHEAST SOUTHWEST NORTHWEST LOCATION DIAGRAM MEAN ANNUAL RAINFALL WARNING: INKS ARE LIGHT SENSITIVE Plotfile for this map generated from digital data: 05-OCT-2006 /covers/project/tas_gw_pros/amls/gw250_se_out yield
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6
800
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70080
0
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HippolyteRocks
ISLANDMARIA
SCHOUTENISLAND
Courland
Bay
Prosser Bay
Pirates Bay
Waterfall Bay
NORFOLK
BAY
Lime Bay
Trumpeter Bay
Big Trumpeter Bay
PrionBay
Bay
Ralphs
BAY
Blac
kman
Bay
Port A
rthur
MoultingLagoon
NorthWestBay
Recherche Bay
Schouten Passage
Thouin Bay
Cloudy
Bay
Isthmus
Bay
MACLEAN
BAY
Coles Bay
GREAT
BAY
Mayfield Bay
PromiseBay
BayGreat
CH
AN
NE
L
South
MAINGON BAY
MARION
WEDGEBAY
OYSTER
Slaughterhouse Bay
RiedleBay
ME
RC
UR
YP
AS
SA
GE
BAY
STORM
FREDERICK HENRY
Two IslandBay
RaoulBay
ADVENTURE
BAY
EsperancePort
Cape Bay
Boreel Head
Mangana Bluff
FLUTED CAPE
TASMAN HEAD
CAPEBRUNY
CloudyHead
West
MenziesBluff
SOUTH EASTCAPE
SoldierBluff
Fishers Pt
Eliza Pt
Scott Pt
QUEEN ELIZABETH
Variety Pt
Head
CAPEDIRECTION
CONTRARIETY
CAPE DESLACS
Mays Pt
PrimrosePoint
Deer Pt
Ironstone
NORTH
HEAD
Point
WEST
West Arthur
Thumbs Pt
Salters Pt
FulhamPoint
CAPE PERON
CAPE BERNIERCAPE MAUROUARD
Quarry Pt
Pt Home Lookout
CAPE BOUGAINVILLE
Middle Bluff
Grindstone Pt
Boags Pt
Buxton Pt
Webber Pt
Hepburn Pt
CAPE FAURE
CAPE SONNERAT
CAPE BAUDIN
CAPE FORESTIER
CAPE TOURVILLE
CAPE DEGERANDO
Gates Bluff
Friendly Pt
Cape Lodi
Peggys Pt
Long Point
CAPE
CAPE
Pt Baily
CAPE BOULLANGER
MISTAKEN CAPE
HAUY
PILLAR
CAPE DE LA SORTIE
The Yellow
CAPE RAOUL
Head
Cape Connella
Little Raggedy
Pt Cecil
ShoemakerPoint
SOUTH CAPE
Lookout PtSecond
Southport Bluff
HopwoodPoint
Ventenat Pt
Chuckle
CAPE
Bluff
HEADOUTER NORTH
CAPE
LesueurPt
Johnsons Pt
Head
Weatherhead Pt
Butlers Pt
POINT
LAUDERDALE
HUONVILLE
GLENORCHY
Dover
Geeveston
Port Huon
Cradoc
Cygnet
Franklin
Cremorne
Lewisham Copping
Murdunna
Taranna
Dunalley
Koonya
Nubeena
Richmond
Colebrook
Tunnack
Ross
Coles Bay
Bagdad
Mangalore
Pontville
Brighton
Maydena
Westerway
Lachlan
Collinsvale
Granton
Fern Tree
Sandfly
Waddamana
Liawenee
Breona
Tunbridge
Oatlands
Kempton
Hamilton
Bothwell
Ouse
BRIDGEWATER
Bicheno
Orford
Triabunna
Avoca
Buckland
Woodsdale
Gretna
Bushy
National Park
Ellendale
Eaglehawk NeckGlen Huon
KINGSTON
Margate
Snug
KetteringBarnesBay
Woodbridge
Middleton
AdventureBay
Alonnah
SouthportHastings
PortArthur
Forcett
SORELLMIDWAY
Sands
Primrose
SOUTH ARM
NEW
Swansea
Shelly Pt
NORFOLK
ParkMacquariePlains
Grove Longley
Campania
Orielton
Parattah
TownCampbell
Conara
Epping Forest
Poatina
Miena
BAKERS
TIER
THE HAZARDS
MT BOBS
MOUNT
LA PEROUSE
HARTZ
MTN
S
MOONLIGHT
RIDGE
BR
UN
YR
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GE
WEL
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TON
RAN
GE
MEEHAN
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RES
TIER
RATS CASTLE
HUMMOCKY HILLS
O’CONNERS
PEAK
PENNY
MT
MT
THUNDERBOLT
DEN HILL
TABLEMTN
MT FIELD
MT DROMEDARY
MT STYX
MT PICTON
MOUNT
HOPETOUN
PRECIPITOUSBLUFF
ADAMSONSPEAK
HARTZ PEAK
MT MISERY
GREY MTN
MT CYGNET
MT BRUNY
MT
FORESTIER
BROWN MTN
BUTLERS HILL
MT
MARIA
THE QUOIN
MT GRAHAM
MT FREYCINET
GREAT
WESTERN
TIERS
TIER
BARREN
BE
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VU
ETI
ER
TIER
DIAMONDKNIGHTS
LO
SHANNON TIER
SCOTTS TIER
WILDDOG
TIER
BRADYSSL
LAN
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BRADYS
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TAYLORSTIER
BLA
CK
TIER
MARSHALL
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TASM
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HW
AY
HILLSNOW
MIILERS
BLUFF
MTFRANKLIN
WOODS
SEYMOUR
QUOIN
SPODE
MT
MT
WEST EAST
FIELD
BLACK TIER
MAYDENA RANGE
MID
LAN
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SNOWY
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SOUTH
NORTH
SN
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SNOWYRANGE
LAKE
QUOIN
Melton Mowbray
MTN
MT
HW
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TOOMSMT
HUON RIVER
RIVER
OU
SE
RIVER
LAKELAGOON
OFISLANDS
RIV
ER
LAKELEAKE
TIBERIAS
RIVER DERWENT
RIVER
DE
RW
EN
T
GREAT
LAKE
ARTHURS
LAKE
LAKE
ECHO
Ouse
WOODS
Clyde
LAKE
SORELL
LAKE
CRESCENT
LAKE
River
RIVER
CLY
DE
River
West
Swan
River
River
Elizabeth
Little
RIVER
JOR
DA
N
TYENNA
RIVER
STYX
RIVER
Shannon
River
PIC
TO
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RIV
ER
HU
ON
RIVER
HUON
WELD
RIVER
PLENTY
RIVER
StPauls R
iver
Sw
anR
iver
RIVER
ESK
MACQUARIE
RIVER
LAK
E
Jord
an
Coa
l
River
Prosser
Riv
er
River
Swanport
LAKETOOMS
Macquarie
River
River
NEW
RIV
ER
Taylors
Great
Bay
Southport
MT
MANGANA
Osterley
TAS
MA
N
SE
A
HOBART
MTRUMNEY
MTWELLINGTON
BayBa rnes
KERMANDIE
DIVIDE
D’E
NTR
ECASTEAU
X
BAY
MUNRO
BIGHT
HENDRICKCAPE FREDERICK
YELLOW
CAPESURVILLE
HIGH
BLUFF
CAPE PAULLAMANON
SEVEN MILEBEACH
Dodges Ferry
SpectacleHead
RIVER
DERWENT
170150
175
155
180
150
185
160
155
5500
5000500
4000
3500
3000
1000250020001500
500000mE 550000mE 600000mE 650000mE5150000mN
5200000mN
5250000mN
5300000mN
5350000mN
500000mE 550000mE 600000mE 650000mE
5150000mN
5200000mN
5250000mN
5300000mN
5350000mN
Tasmania
MINERAL RESOURCESTASMANIA
SOUTHEAST TASMANIAGROUNDWATER MAP
DEPARTMENT of INFRASTRUCTUREENERGY and RESOURCES
POROUS(INTERGRANULAR)
PERCENTIRRIGATIONSUCCESSFUL(YIELD >=1.5)
NUMBEROF BORES
ROCK GROUPSAQUIFER TYPE
20 75 8.30.52 (12)
These aquifers are contained in surface deposits of limited thickness. Yields depend on grain size, clay content and saturated thickness. There
Quality is variable and salt content may limit uses in some areas.Aquifers are unconfined to confined.
These aquifers are contained in surface deposits of limited thickness.Yields in alluvium are variable and often low due to a relatively high clay content. However, where the sediments are coarse grained and free of
in such situations are usually poor. In the areas where these units are present, there are often good prospects of obtaining groundwater fromunderlying materials. Many successful bores penetrate these surface deposits and obtain water from underlying rocks. In many cases theunderlying rock will be that which surrounds these deposits at the surface.Water quality in the coarser sediments is often good. Nearby surface streams may recharge them.Aquifers are unconfined to confined.The major areas where these sediments occur are the southern part of the Launceston Tertiary Basin from Campbell Town to Epping and theCoal River Valley region where prospectivity is high and groundwater is stored in fine to medium grained sand, coarse sand and gravel. Waterquality is variable in these deposits and salinity often reaches levels that seriously limit use. The high average yield of successful bores reflects
operations. Particularly low prospective areas include the Penna area, Cranbrook (where 11 bores failed to obtain useful water in clay sediments
Development of bores in these sediments, particularly where the aquifers are fine to medium grained sand require specialist drilling skills toestablish reliable operating bores.Aquifers are often confined and occasionally unconfined.
Aquifers are mainly unconfined to confined locally.
Only a few bores have been drilled in these rock types in the region and results are not regarded as particularly representative. Three bores have
Aquifers are semiconfined to confined and occasionally unconfined.
yielding bores. Particularly prospective areas are the Campbell Town and Pawleena Road (near Sorell) areas. Excessive use in these areascould result in restrictions on use being applied because they are both low rainfall (and hence low recharge) areas.Storage per unit volume can be greater in basalt than some other fractured rock units because of the presence of vesicles (gas holes) and thegenerally more intense fracturing system.Quality is variable and salinity is often moderate to high which restricts use.Aquifers are mainly confined to unconfined locally.
Jurassic dolerite is usually less fractured than Tertiary basalt and as a result has lower prospectivity at most locations. The proportion ofsuccessful bores is lower than the Permian / Triassic and Tertiary basalt units but average output of those that are successful is relatively high.
successful bores.Quality is variable and salinity in low rainfall areas is often at levels that restrict use.Aquifers are often unconfined, semiconfined to confined.
Only a few bores have been drilled in these rocks in the region and results are not regarded as particularly representative. Although the fourbores reported all obtained water, this is a much greater percentage success rate than bores attempted in these rocks outside the area wheremany more bores have been drilled.Granitic rocks are generally less fractured than most other rock types, resulting in generally lower yields and success rates for water bores.Aquifers are unconfined to confined.
POROUS(INTERGRANULAR)
POROUS(INTERGRANULAR)
LOW -MODERATE
POROUS(INTERGRANULAR)
FRACTURED ROCK(Intergranular onsome horizons)
FRACTURED ROCK Tertiary basalt.
MODERATEFRACTURED ROCK
FRACTURED ROCK
Quaternary coastal plain deposits consisting of sand,clayey sand, and gravel, underlying areas near thecoast.Probable marine origin.
Quaternary, alluvium talus and till deposits.
The talus consists of boulders with a moderate to highclay content.
46 43.5 0.31 (17) 0.63
34 61.8 0.77 (18) 5.55.05
FRACTURED ROCK
138 52.9 15.17 535 - 58001.56 (60)
1787 116 - 1379019.125.378
Cambrian and Precambrian rocks in southwest.
16.7 1003.783.78 (1)6
181 81.8 3.25 (140) 25.25 40.7 560 - 8390
100 1.01
63.1 19.8 70 - 1120018.951.24 (293)480
4 0.60 (4)
HIGH
HIGH
MODERATE -HIGH
HIGH
PROSPECTIVITY(Whole of Tasmania)
LOW -MODERATE
MODERATE-HIGH
(Low on this map)
Tertiary sediments consisting of clay, sand and gravel.Variable thickness up to several hundred metres.Lacustrine and alluvial sediments.
Minor windblown sand on sloping bedrock.Terrestrial origin.
the coarser grained units (sandstone, conglomerate). Transmission of water to bores is probably largely via joints and bedding planes.Triassic and Permian rocks are mainly regarded as fractured rock aquifers although there is likely to be some intergranular storage and flow in
been drilled in each rock group on single properties at closely spaced locations. The grading of the prospectivity refers to known results in these
Tertiary basalt is the most prospective rock unit in the region. It has the highest success rate for bores drilled as well as a high proportion of higher
Jurassic dolerite.Minor Cretaceous syenite and Cambrian andPrecambrian rocks and Tertiary basalts (Bream Creekarea).
1. Statistics provided in the legend are based on deep boreholes entered in MRT groundwater database (BORIS) by February 2003. Boreholes shown on the map are those with locations mainly supplied by drillers and from location in the field by MRT staff.
1.23 (1316)
GENERAL AQUIFER CHARACTERISTICS
These aquifers are contained in surface deposits of limited thickness up to a maximum of about 12 metres but usually less. Yield depends ongrain size and thickness of saturated sand and decreases as the clay content of the sand increases. Groundwater is often extracted from these
Aquifers are mostly unconfined.
Quaternary aeolian deposits marginal to the coastconsisting of fine to medium grain size sand.
These rocks are the most commonly drilled in the region. Yields range up to irrigation quantities and groundwater is used for domestic, garden,stock and irrigation purposes.
Ordovician to Devonian turbidite sequence of sandstoneand mudstone (Mathinna Supergroup).
rock units outside the area covered by this map where large numbers of bores have been drilled with much better results. Mathinna Supergrouprocks are one of the more prospective units for groundwater in the State.
6. In areas where there is little or no water bore data, the groundwater prospectivity has been assumed to be similar to that in the areas where data are widely available.
4. There are many spear bores installed for investigation and production purposes in coastal sand deposits in Tasmania. Salinity
210 - 5000
1840 -11200
210 -8290The alluvium consists of clay, together with sand and
gravel deposits with varying clay content.
LOW - HIGH
Talus and windblown sand are often in elevated locations on the side of steep slopes and prospects of appreciable quantities of groundwater
Quality is variable and salinity restricts use at many locations. Near surface lower yielding zones often have poorer quality groundwater than
1700
Outputs of bores are those supplied by drillers and are mostly the result of short term pumping measurements. Some bores havebeen successful, but outputs have not been reported. These bores are included in the total percentage of successful bores but have not been used for other statistical calculations. Boreholes reported as dry holes usually have a small unreported
SALINITY RANGE (mg/L)
PERCENTAGESUCCESSFUL(YIELD >0.03)
3.78
MAXIMUMYIELD (L/s)
AVERAGEYIELD (L/s) #
sufficient for domestic, garden, stock. A nest of 10-20 spears using a central pump may yield small irrigation quantities (5-10 L/s).
Quality is often good enough for the water to be used for a wide range of purposes. Major resources occur in sand deposits behind Nine Mile
Yields of up to about 20 L/s have been obtained (irrigation quantities) and domestic / stock / garden quantities are commonly obtained in the
yield (<0.05 L/s).2. # Boreholes with yields >0.03 L/s have been considered as successful bores. Yield related statistics (average, maximum yield and percent irrigation successful) are based on the number of successful bores (numbers in brackets in the average yield column).
3. Successful bores with a reported yield of >= 1.5 L/s have potential for small irrigation purposes. Very limited irrigation is possible with lower yields.
43.3
Triassic sandstone (lithic and quartz), mudstone, minorcoal, terrestrial origin.
Permian mudstone, siltstone, sandstone (often pebbly),minor limestone and conglomerate. Mainly marine origin,glacial conditions, minor zones of terrestrial origin.
Devonian granitic rocks.
5. Small elevated areas of any hydrogeolgical unit will usually have lower prospectivity because of limited storage and high drainage rates.
aquifers using spear bores installed to depths of up to 7-8 metres. A single spear in some prospective areas may yield 0.5 L/s or more i.e.
clay, yields can be appreciable e.g. Melrose Road, Tunbridge where the reported output of a bore is 5.1 L/s.
to 200 metres depth) and Little Swanport (4 bores obtained no useful supplies in clay sediments).
Beach north of Swansea and at Seven Mile Beach. Significant resources occur at other locations e.g. Safety Cove, South Arm peninsula, Bruny Is.
are few known high yielding zones in the region but it is often possible to extract small quantities of groundwater using spear bores e.g. SouthArm peninsula.
deeper higher yielding zones. High sulphate groundwater occurs in the Permian at some locations e.g. just north of central Tunnack. Triassic
likely to be less prospective than lower lying locations in most cases.rocks at Dodges Ferry are particularly prospective but water quality limits use in some locations. Elevated and / or steeply sloping areas are
High.
VULNERABILITY TO POLLUTION
Low to moderate.Can be higher if localised highly fracturedzones are not covered by a layer of lowerpermeability material.
Moderate.Can be high if highly fractured zones arenot overlain by low permeability material.
High.A thick layer of low permeability materialcovering the aquifer will reducevulnerability.
High.Low permeability material at the surfacewill offer some protection and vulnerabilitymay be reduced to low to moderate.
Low(Generally clay layers overlie the aquifersin most cases).
Moderate to high.Depends on whether low permeabilitymaterial overlies the aquifer.
Low to high.Clayey material at the surface will aid inprotecting groundwater at depth includingunderlying rocks. Coarse-grainedaquifers without such protection arevulnerable as are aquifers underlyingthem.
High.Very occasionally deep clay soils mayoffer some protection and lowervulnerability
the results from the Campbell Town - Epping area. Smaller areas of Tertiary sediments have provided very mixed results from water boring
ranges for some of the Quaternary aquifers in south-east Tasmania have been obtained from these borehole records and included in the legend (marked with a star ).
7. The southeast part of the state that this map covers includes a major portion of the State that has low rainfall / high evaporation and which is subject to soil salinity problems. Low rainfall / high evaporation is also probably the cause of the relatively poor quality of groundwater at many locations in the region.
170Potentiometric contours of deeperTertiary Aquifers (5 m contour interval)Longford Area (Geological Bulletin 59)
1500
Salinity contours of deeper Tertiary Aquifers(500 mg/L contour interval)Longford Area (Geological Bulletin 59)
While every care has been taken in the preparation of this data,no warranty is given as to the correctness of the information andno liability is accepted for any statement or opinion or for anyerror or omission. No reader should act or fail to act on the basisof any material contained herein. Readers should consult professionaladvisers. As a result the Crown in Right of the State of Tasmaniaand its employees, contractors and agents expressly disclaim all andany liability (including all liability from or attributable to anynegligent or wrongful act or omission) to any persons whatsoever inrespect of anything done or omitted to be done by any such person inreliance whether in whole or in part upon any of the material in this data.Crown copyright reserved.
The rainfall map shows the mean annual rainfall over Tasmania for the standard 30-year period from 1961to 1990. It was derived by the Climate and Consultancy Section in the Tasmania and Antarctica RegionalOffice of the Bureau of Meteorology, from a gridded analysis prepared by the Bureau’s National ClimateCentre. The analysis system blends measured rainfall with topography to give estimates of rainfall foreach area. The results will be less accurate in mountainous or data-sparse regions, and may differfrom the observations at individual locations.
NORTHEAST
SOUTHEASTSOUTHWEST
NORTHWEST
LOCATION DIAGRAM
MEAN ANNUAL RAINFALL
WARNING: INKS ARE LIGHT SENSITIVE Plotfile for this map generated from digital data: 05-OCT-2006
/covers/project/tas_gw_pros/amls/gw250_se_out yield
