Scoping Workshop Hydrogeological Aspects and Selection of Potential Sites C.J.H. Hartnady Umvoto
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Transcript of Scoping Workshop Hydrogeological Aspects and Selection of Potential Sites C.J.H. Hartnady Umvoto
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Ecological and Environmental Impacts of Large-scale
Groundwater Development in the Table Mountain Group
(TMG) Aquifer System
Scoping WorkshopScoping Workshop
Hydrogeological Aspects and Hydrogeological Aspects and Selection of Potential SitesSelection of Potential Sites
C.J.H. HartnadyC.J.H. Hartnady
UmvotoUmvoto
28 March 200328 March 2003
Scoping WorkshopScoping Workshop
Hydrogeological Aspects and Hydrogeological Aspects and Selection of Potential SitesSelection of Potential Sites
C.J.H. HartnadyC.J.H. Hartnady
UmvotoUmvoto
28 March 200328 March 2003 WRC Eco Project
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WRC Eco Project
Objectives
Introduce TMG aquifer definitionsIntroduce TMG aquifer definitions
Define target zones for CCT ProjectDefine target zones for CCT Project
Discuss groundwater target type settingsDiscuss groundwater target type settings
Provide hydrogeological background to Provide hydrogeological background to scoping of potential impactsscoping of potential impacts
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WRC Eco Project
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TMG GroundwaterAquifers and Aquifers and AquitardsAquitards
WRC Eco Project
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TMG Groundwater
Fractured-rock Fractured-rock aquiferaquifer
AquitardAquitard
Regolith (weathered-and-Regolith (weathered-and-fractured) aquiferfractured) aquifer
Aquifers and Mountain Aquifers and Mountain SpringsSprings
WRC Eco Project
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GroundwaterUnconfined and Confined Unconfined and Confined AquifersAquifers•Unconfined aquifer – Aquifer overlain by an unsaturated (vadose) zone or a surface water body. Its upper surface is the water table
•Confined (or artesian) aquifer Confined (or artesian) aquifer – – Aquifer overlain by a low-permeability unit Aquifer overlain by a low-permeability unit (confining layer). A confined aquifer does (confining layer). A confined aquifer does not have a water table, only a not have a water table, only a potentiometric surfacepotentiometric surface which is defined by which is defined by water levels in boreholes under pressure.water levels in boreholes under pressure.WRC Eco Project
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TMG Groundwater
Aquifers: Aquifers:
Confined / Confined / Unconfined Unconfined
WRC Eco Project
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Radius of influence (rRadius of influence (ree))
for pumped wellfor pumped well
independent of abstraction rateindependent of abstraction rate (Q) (Q) depends only on:depends only on:
hydraulic conductivityhydraulic conductivity (K (K))
specific storage (Sspecific storage (Sss) )
durationduration (t) of abstraction(t) of abstraction
rre e == 1.5 (Kt/S1.5 (Kt/Sss))1/21/2
TMG Groundwater
rree
tt
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WRC Eco Project
TMG GroundwaterHermanus Hermanus DevelopmentDevelopment
oo
oo
oooo
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TMG Target Generation
Southern Target Region Southern Target Region Target Zone K (Kogelberg)Target Zone K (Kogelberg) Target Zone H (Hottentots-Holland)Target Zone H (Hottentots-Holland) Target Zone T (Theewaterskloof)Target Zone T (Theewaterskloof) Target Zone B (Brandvlei – south)Target Zone B (Brandvlei – south) Target Zone W (Wemmershoek)Target Zone W (Wemmershoek)
Northern Target Region Northern Target Region Target Zone B (Brandvlei – north?)Target Zone B (Brandvlei – north?) Target Zone V (Voelvlei)Target Zone V (Voelvlei) Target Zone A (Agter-Target Zone A (Agter-
Witzenberg ?)Witzenberg ?)
Southern Target Region Southern Target Region Target Zone K (Kogelberg)Target Zone K (Kogelberg) Target Zone H (Hottentots-Holland)Target Zone H (Hottentots-Holland) Target Zone T (Theewaterskloof)Target Zone T (Theewaterskloof) Target Zone B (Brandvlei – south)Target Zone B (Brandvlei – south) Target Zone W (Wemmershoek)Target Zone W (Wemmershoek)
Northern Target Region Northern Target Region Target Zone B (Brandvlei – north?)Target Zone B (Brandvlei – north?) Target Zone V (Voelvlei)Target Zone V (Voelvlei) Target Zone A (Agter-Target Zone A (Agter-
Witzenberg ?)Witzenberg ?)
CCT Feasibility & Pilot CCT Feasibility & Pilot ProjectProject
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Target Zone Definition: Southern Area
FaultsFaults FracturesFractures
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Target Zone Definition: Northern area
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WRC Eco Project
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TMG GroundwaterFluid Flow in FracturedFluid Flow in Fractured
RockRock
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WRC Eco Project
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Brandvlei (B) Target Zone: Northern area
Potential targets ?Potential targets ?
GoudiniGoudini
BrandvleiBrandvlei
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WRC Eco Project
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W Target Zone:Wemmershoek-Berg River scheme links
La Motte FaultLa Motte Fault
Klein Klein Drakenstein FaultDrakenstein Fault
ZSZS
ZS = ZS = Zachariashoek Zachariashoek SynclineSyncline
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WRC Eco Project
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H Target Zone: Steenbras-Palmiet scheme conjunction
KAKA
SSSS
SS = Steenbras SynclineSS = Steenbras SynclineKA = Kogelberg AnticlineKA = Kogelberg Anticline
Possible deep flow-path to submarine dischargePossible deep flow-path to submarine discharge
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T Target Zone: Theewaterskloof scheme conjunction
RechargeRecharge
DischargeDischarge
Steenbras-BrandvleiSteenbras-BrandvleiMegafaultMegafault
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WRC Eco Project
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Voelvlei (V) Target Zone:Waterval Syncline and faults
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WRC Eco Project
Thanks for Thanks for your your
attentionattention
Thanks for Thanks for your your
attentionattention
Ecological and Environmental Impacts of Large-scale Groundwater Development in the Table Mountain Group (TMG) Aquifer System
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WRC Eco Project
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City of Cape Town
Exploratory Phase Drilling: Typical Set-up
DWAF Core RigDWAF Core Rig
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Exploratory Phase Drilling: Typical Set-up
Air Percussion RigAir Percussion Rigatat
HermanusHermanus
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Exploratory Phase Drilling: Typical Set-up
Air Percussion RigAir Percussion Rigatat
HermanusHermanus
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Exploratory Phase Drilling: V-notch yield measurement during air-lift test
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Exploratory Phase Drilling:Hermanus Magnetic Observatory site
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Hermanus monitoring borehole:Final construction and site rehabilitation
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Table Mountain Group (TMG) SuperaquiferOutcrop and subsurface Outcrop and subsurface
extentextent
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TMG GroundwaterFluid Flow in FracturedFluid Flow in Fractured
RockRock
Landsat 5Landsat 5Band 347 (RGB)Band 347 (RGB)
compositecomposite
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Hydrogeological Data Acquisition: 1:50 000 Digital Geology (CGS)
WRC Eco Project