Day2 2 joel_hydrogeology_namibia

L.Joel & G.Mulokoshi22 May

2014

STAMPRIET TRANSBOUNDARY AQUIFEROverview over Namibian

Groundwater Data

Locality Plan

WINDHOEK

Olifants river

Nossob riverAuob river

HERERO LAND

Aminuis

24゜

25゜

23゜

22゜

26゜

17゜ 18゜ 20゜

17゜ 18゜ 19゜ 20゜

22゜

23゜

24゜

25゜

26゜

19゜

N

0 50 100km

Mariental

Gochas

Aranos

Leonardville

Stampriet

Gibeon

Rehoboth

Schlip

Gobabis

Kalkrand

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Study Area

Communal Farm

Commercial Farm

Town

Village

Ephemeral River

National Roads

Main Roads

Regions

Legend

Study Area

W I N D H O E K

ANGOLA

NAMIBIA

ZAMBIA

BOTSWANA

SOUTHAFRICA

ZIMBABWE

ATLANTIC OCEAN

Country Area : 824,292 km2 Study Area : 71,000 km2

Population : 35,000 people

Meteorology

Geology

#Y

#Y

#Y

#Y

#Y

#Y

#Y

#Y

#Y

%

%

%

%

%

%

%

%

%

%

%%

%

%

%

%

%

%

%

%

%[

%[

%[

%[

%[

%[

J-1

J-2

J-3

J-4

J-5

J-6

J-7

J-8

J-9

Gobabis

Rehoboth

Kalkrand

Windhoek

Mariental

Leonardville

TsesKoes

Mentz

Gochas

Schlip

Tsumis

Dobbin

Gibeon

Aranos

Aminius

Genesis

Corridor

Komnarib

Duineveld Hoachanas

Stampriet

Mata-Mata

Uhlenhorst

Wandervogel

Klein VaalgrasKaroo DoleriteKalkrand BasaltPrince Albert F.Nossob M.Auob M.whitehill M.Dwyka G.Nama G.Damara S.RoadMain RoadStudy AreaAminius

#Y JICA Test BoreholeFault 2Fault 1Lineament 2Lineament1

% Town%[ Major Town

N

EW

S

0 1020 (Km)

26° 26°

25° 25°

24° 24°

23° 23°

17°

17°

18°

18°

19°

19°

20°

20°

Kalahari Beds

(Late Cretaceous-Present)

Kalkrand Basalt, Karoo Dolerite (Jurassic ）

Prince Albert F.

(Permian)

Dwyka G. (Carboniferous)

Nama G. Damara S. (Cambrian-Pre-Cambrian)

Geology

700

800

900

1000

1100

1200

1300

1400

(m ASL)

NW SE

50 100 150 200 250 3000 (Km)

K Kalahari BedsB Kalkland BasaltDo Karoo DoleriteR Rietmond MemberA Auob MemberM Mukorob MemberN Nossob Member

P.E. Pre-Ecca Group

Geological Cross Section-6

N

N

P.E.

P.E.

N

P.E.

Do

P.E.

BB

M

M

M

A

A

A

A

A

R

R

R

R

R

R

K

K

K

K

Hoachanas

StamprietGochas

Auob R.TweeriverAuob R.

Section-3 Section-4

Section-2Section-1

< Fig.2-1 Geological Cross Section of Study Area >

Hydrogeological classification

Upper (sand)Lower (shale) 3rd Impermeable LayerA5(sand) A5A4(shale) A4A3(sand) A3A2(shale) A2A1(sand)Upper (sand)Lower (shale) 2nd Impermeable Layer

Nossob Aquifer (G1)

1st Impermeable LayerPre Ecca Group (Basement)

Hydrogeological ClassificationGeological Classification

Nossob Member

Kalahari Aquifer (G3)

Auob Aquifer (G2)

Rietmond Member

Auob Member

Mukarob MemberA1

Prin

ce A

lber

t Fo

rmat

ion

Kalahari Beds

Hydrogeological classification

D=450m

D=450m

700

800

900

1000

1100

1200

1300

1400

(m ASL)

SW

NE

50 100 150 200 250 3000 (Km)

Extensive and highlyproductive aquifer

Extensive and moderatelyproductive aquifer

Extensive and lowproductive aquifer

Local or discontinuousmoderately productive

Local or discontinuous lowto no productive aquifer

Strata with essentially nogroundwater resources

Auob Aquifer

Kalahari Aquifer

Nossob Aquifer

Kalkland Basalt

Karoo Dolerite

Pre-Ecca Group, LowerRietmond and Lower Mukarob

GochasAuob R.

GenesisNossob R.

Section-6Section-7 Section-5 Section-8

Hydrogeological Cross Section-3

GRIMGroundwater Resources Information

Metadata Whereabouts, Contents, etc. of some 200 documents

Some of them attached to the bibliography (from colonial times until today)

Listing of existing Data 1

CSIR Water Quality DataSome 4 000 water points information

Listing of existing Data 2

Farm; water use; and chemical analyses, 1965-1982

CSIR Water Quality Maps Four 1 : 1 000 000 Maps

Listing of existing Data 3

TDS, SO4, NO3, F (1982)

PhD THESIS TREDOUX ‘n Geohdrochemiese Ondersoek van die

Artesiese Kom Stampriet (1981)

Listing of existing Data 4

Electronic Borehole Data

Some 4 000 water points information

Listing of existing Data 5

Borehole completion reports and basic chemical data captured in Excel files and plotted on Master

Maps (since 1979)

GROWAS Namibian Water Points Information

Listing of existing Data 6

Borehole data; Chemical analyses; Statigraphy.Variable detail and accuracy (since the late 1990s).

JICA REPORTGeophysical, Geological, Drilling,

Monitoring Data

Listing of existing Data 7

Complete study of the SAB including Modelling

HydroCensus 2000-2002

Nearly 5 000 water points information

Listing of existing Data 8

GPS coordinates (Schwarzeck Datum); Water levels where accessible; EC; and farming information

IAEA Report RAF 8/029 Isotopic information

Listing of existing Data 9

14C; Tritium; and stable Isotopes (2000-2002).

Other Isotopic investigations

Vogel; Geyh; Talma; Verhagen; and others

Listing of existing Data 10

14-C; Tritium; stable Isotopes, 15-N (since about 1967).

WATER LEVEL DATA 22 Monitoring boreholes in the SAB

Listing of existing Data 11

Older data on charts, more recent data in electronic format (since the 1960s)

ABSTRACTION DATA 1 Production data from 5 Namwater

Schemes

Listing of existing Data 12

Monthly abstraction and Water level data, early data in DWA reports, recent Namwater data

electronic.

ABSTRACTION DATA 2 Abstraction data from Irrigation Farms

Listing of existing Data 13

Not complete, not always accurate, filed at Law Admin.

Hydrogeological Map 1 : 1 000 000 Map of Namibia

Listing of existing Data 14

Indication of Potential and Quality, with Brochure (2001)

Key references

GRIM

THANK YOU