Managing Managing the impact of irrigation on the the impact of irrigation on the Tosca Tosca Molopo groundwater resourceMolopo groundwater resource

(1)

Managing

Managing the impact of irrigation on the the impact of irrigation on the Tosca

Tosca Molopo groundwater resource Molopo groundwater resource

Gawie van Dyk Gawie van Dyk

Department Water Affairs and Forestry Department Water Affairs and Forestry

Lower Vaal Management Area Lower Vaal Management Area

South Africa South Africa

Acknowledge Acknowledge All water users All water users

WUA Pilot Committee WUA Pilot Committee

DWAF Personnel

(2)

The Lower Vaal WMA in South Africa

(3)

Study area within the WMA

(4)

Groundwater issues within the Groundwater issues within the

WMA WMA

• Groundwater utilisation of major importance in WMA - only source of water over much of WMA

• Mainly used for rural domestic supplies, stock watering, water supplies to several towns, but also for irrigation

• Total yield from groundwater more than double surface water resources

• Localised over-exploitation of groundwater due to excessive use for irrigation

• Concern about impacts of upstream farm dams and alien vegetation on yield from groundwater

• Major de-watering of groundwater aquifers for mining purposes at Sishen

• Need for better management of transborder ground-water aquifers shared by South Africa and Botswana

(5)

Physiograhy of the area Physiograhy of the area

Topography, drainage Topography, drainage

B o t s w a n a

M o l o p o r i v e r

D o r i n g

W i l d e b e e s h o r i n g

V a l s T l h a g a m e n g

V e r g e l e e

T o s c a

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0 2 4 . 5 0

- 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0

2 3. 7023 . 8 023 .9 02 4.0 02 4. 102 4. 202 4.3 024 . 4 0 - 26 . 0 0- 25 . 9 0 - 25 . 8 0 - 25 . 7 0

S t u d y a r e a

(6)

Climate and Precipitation Climate and Precipitation

Annual Precipitation at Pomfret

0 100 200 300 400 500 600 700 800

60/61 61/62 62/63 63/64 64/65 65/66 66/67 67/68 68/69 69/70 70/71 71/72 72/73 73/74 74/75 75/76 76/77 77/78 78/79 79/80 80/81 81/82 82/83 83/84 84/85 85/86 86/87 87/88 88/89 89/90 90/91 91/92 92/93 93/94 94/95 95/96 96/97 97/98 98/99 99/00 00/01 01/02 02/03

Hidrological Year

precipitation (mm)

JUN MAY APR MAR FEB JAN DEC NOV OCT SEP AUG JUL

(7)

The The

Molopo Molopo

river river

Dec Dec 2001 2001

Dec Dec

2004 2004

(8)

Land use and water use Land use and water use

Year 1990 1996 2000 2001 2002

Irrigation systems 2 22 32 40 45

Irrigation area (ha) 100 600 1182 1495 2000

Volume Irrigated (Mm

³

/a) 0.77 4.6 9.1 11.1 18.9

^#

Stock watering (Mm

³

/a) 0.5 0.5 0.5 0.5 0.5

Human consumption (Mm

³

/a) 0.5 0.5 0.5 0.5 0.5

Total (Mm

³

/a) 1.8 5.6 10.1 12.1 19

(9)

Geology Geology

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0 2 4 . 5 0 - 2 6 . 0 0

- 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0

V e r g e l e e

T o s c a

G 4 7 6 0 4 G 4 7 6 0 5G 4 7 6 0 6 G 4 7 6 0 7

G 4 7 6 0 8G 4 7 6 0 9 G 4 7 6 1 0

G 4 7 6 1 1 G 4 7 6 1 2

G 4 7 6 1 3 G 4 7 6 1 4

G 4 7 6 1 5

G r a n i t e Q u a r t z i t e D o l o m i t e

B a n d e d I r o n s t o n e K a l a h a r i s e d i m e n t s

L e g e n d

D o l e r i t e d y k e

R U 1

R U 2 R U 3

2 3 . 7 02 3 . 8 02 3 .9 02 4 . 0 02 4 . 1 02 4 .2 02 4 .3 02 4 . 4 0 - 2 6 . 0 0 - 2 5 . 9 0- 2 5 . 8 0 - 2 5 . 7 0

S t u d y a r e a

A

A '

B B '

C C

D

D '

(10)

YIELD FREQUENCIES OF BOREHOLES IN YIELD FREQUENCIES OF BOREHOLES IN

THE THE DOLOMITE DOLOMITE

(1324 BOREHOLES ANALYSED)

(1324 BOREHOLES ANALYSED) (888 dry boreholes ommitted (888 dry boreholes ommitted ) )

0 5 10 15 20 25 30 35 40 45 50

PERCENTAGE

0.0-0.1 0.1-0.5 0.5-2.0 2.0-5.0 >5.0

yield in l/s

(11)

Groundwater Quality Groundwater Quality

80 60 40 20 20 40 60 80

20 40

60

80 80

60 40

20 20

40 60

80

20 40 60 80

Ca Na HCO

3 Cl

Mg SO4

Recently recharged groundwater

(12)

Recharge Recharge

CMB method 0.2 to 28 mm/a of MAP harmonic mean =1.5mm/a.

0.1 to 7.3% of MAP harmonic mean of 0.4%.

Deuterium and oxygen 18

indicate immediate and delayed recharge to the aquifer in different areas of the aquifer

Carbon 14

confirm that preferred recharge in areas of the aquifer and probably along preferred pathways .

CRD and SVF methods

could not be applied with certainty due to the lack of sufficient water level data .

For GM purposes used

1.75% of MAP or 9.7 mm/ of MAP

(13)

Conceptual Model Conceptual Model

1 2 0 0 1 1 0 0

1 0 0 0

9 0 0 m

1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 k m

( 1 9 9 0 ) ( 2 0 0 1 ) ( 2 0 0 1 )

( 1 9 9 0 )

G 3 9 6 8 4 G 3 9 6 8 5 G 3 9 6 8 7 G 3 9 6 9 3

( 2 0 0 3 ) M o l o p o r i v e r

D o l o m i t e

K a l a h a r i s e d i m e n t s Q u a r r e e f o n t e i n

B I F G r a s s b a n k d y k e

Q u a r r e e f o n t e i n d y k e G 3 9 6 7 8 G 3 9 6 7 9 G 3 9 6 8 5 G 3 9 6 8 0 G 3 9 6 7 7

( 2 0 0 3 )

( 1 9 9 0 )

D o l o m i t e K a l a h a r i s e d i m e n t s

Q u a r t z i t e

G r a n i t e

S N S N S N

E W

B I F

D o l o m i t e Q u a r r e e f o n t e i n d y k e

( 1 9 9 0 ) ( 2 0 0 3 )

G 3 9 6 7 0 G 3 9 6 7 1 G 3 9 6 8 7 G 3 9 6 7 2

1 0 0 0

9 0 0 1 1 0 0

( 2 0 0 3 ) ( 1 9 9 0 )

T O 2 G 3 9 6 7 3 G 3 9 6 9 3

B I F

D o l o m i t e

Q u a r r e e f o n t e i n d y k e K a l a h a r i s e d i m e n t s

K a l a h a r i s e d i m e n t s

A A '

B B ' C C ' D D '

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0 2 4 . 5 0

- 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0

V e r g e l e e

T o s c a

G 4 7 6 0 4 G 4 7 6 0 5 G 4 7 6 0 6 G 4 7 6 0 7 G 4 7 6 0 8 G 4 7 6 0 9 G 4 7 6 1 0

G 4 7 6 1 1 G 4 7 6 1 2

G 4 7 6 1 3 G 4 7 6 1 4

G 4 7 6 1 5

G r a n i t e Q u a r t z i t e D o l o m i t e B a n d e d I r o n s t o n e K a l a h a r i s e d i m e n t s L e g e n d D o l e r i t e d y k e R U 1

R U 2 R U 3

23.7 0 23 .8023 .9024.0 0 24 .1024.2 024.3 0 24 .40

-26 .00-25 .90-25 .80-25 .70

S t u d y a r e a A

A '

B B '

C C

D D '

(14)

Spring at the Quarreefnt dyke

(15)

Aquifer parameters Aquifer parameters

Bore

hole Lat Long T-late [m2/d]

Est.

S-late Q (l/s/

24h)

Water strike (m)

Remark

G36669 25.882 24.113 6.30 0.002 1.02 36,45, 55,57

Carstic dolomite Layer 2

G39684 25.949 23.826 109.59 0.002 16.70 34-40 Carstic dolomite Layer 2

G39691 25.877 24.019 41.02 0.002 4.00 110 Carstic dolomite Layer 2

G39693 25.674 24.144 37.92 0.005 13.00 96,

157 Primary aquifer Layer 1 TO1 25.954 23.754 1000 0.002 22.00 Carstic dolomite Layer

2 TO3 25.949 23.756 790 0.002 28.00 Carstic dolomite Layer

2

(16)

Transmisivity and storativity in zones of layer 1.

T=17 S=0.005

T=27 S=0.005

T=9

S=0.005

T=9

S=0.005 T=20

S=0.005

T=17 S=0.005 T=37

S=0.005

T=10 S=0.005

(17)

Transmisivity and storativity in zones of layer 2.

T=10T=10 S=0.002 S=0.002

T=10T=10 S=0.002 S=0.002 T=10T=10

S=0.002 S=0.002

T=10T=10 S=0.002 S=0.002 T=10T=10

S=0.002 S=0.002

T=2T=2

S=0.002 S=0.002

(18)

Groundwater vs surface elevation Groundwater vs surface elevation

y = 1.691x - 799.95 R² = 0.6913

y = 0.9889x - 55.694 R² = 0.0508

950.00 1000.00 1050.00 1100.00 1150.00 1200.00

950 1000 1050 1100 1150 1200

Surface Elevation (mamsl) Water level elevation (mamsl) Apr-90

Aug-03

Linear (Apr-90) Linear (Aug-03)

(19)

Recharge to aquifer Recharge to aquifer

Zone 2

R=1.5% MAP

Zone 1 R=2% MAP 7.5 mm/a

Average

1.75 %/a MAP 9.7 mm/a MAP

Zone 3 R=0.5%

MAP 1.9 mm/a Zone 3

R=0.5% MAP 1.9 mm/a

Zone 2

R=1.5% MAP 5.6 mm/a

Zone 4 R=3% MAP 10.5 mm/a

(20)

Calibration transient

(21)

Observed vs simulated hydrolic Observed vs simulated hydrolic

heads heads

1000 1020 1040 1060 1080 1100 1120 1140 1160

Observed hydrolic heads (mamsl)

C a lc u la te d h y d ro li c h e a d s (m a m s l)

(22)

V e r g e l e e

T o s c a

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0

T o s c a g r o u n d w a t e r l e v e l d i f f e r e n c e ( A p r i l 2 0 0 1 m b e l o w 1 9 9 0 l e v e l s )

- 2 6 . 1 0 - 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0 - 2 5 . 6 0

- 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 1 0 2 0

V e r g e l e e

T o s c a

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0

T o s c a w a t e r l e v e l d i f f e r e n c e ( A p r i l 2 0 0 2 m b e l o w 1 9 9 0 l e v e l s )

- 2 6 . 1 0 - 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0 - 2 5 . 6 0

G 3 9 6 6 3 G 3 9 6 6 4 G 3 9 6 6 5

G 3 9 6 6 7 G 3 9 6 6 8

G 3 9 6 6 9G 3 9 6 7 0

G 3 9 6 7 2 G 3 9 6 7 3

G 3 9 6 7 4

G 3 9 6 7 8 G 3 9 6 7 9 G 3 9 6 8 1G 3 9 6 8 3 G 3 9 6 8 4

G 3 9 6 8 5

G 3 9 6 8 6 G 3 9 6 8 7

G 3 9 6 8 8 G 3 9 6 9 1 G 3 9 6 9 2

G 3 9 6 9 3

G 3 9 6 9 4 H K 2

B H 1 B H 2

F S 1FS 2 H T 1

A Y

N I 1

F S 1 F S 3 W G 2W G 1 J P 1

T O 1 N E 2

N E 1 N E 3

S D 2S D 4 I D 2 V L 1 V L 2 B N 2 B Y 3 H T 2

Q N 1QN 2

M K 1 G K 3

V E 1V E 2 H N 1

Q N 3 Q N 4 B M 1 B M 2 D N 1 D N 2E W 1 S T 1 E W 2 E W 4

S T 2 M D 1S R 2S R 1 K A 1K A 2 M D 2

J P 2 J P 3

G K 3

- 7 0 - 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 1 0 2 0

V e r g e l e e

T o s c a

- 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0 - 2 5 . 6 0

1 0 7 1 . 6 1 0 6 9 . 3 6 1 0 7 9 . 0 9

1 1 0 8 . 7 4 1 1 1 1 . 4 2

1 0 4 8 . 5 8 1 0 5 7 . 8 9 1 0 0 3 . 9 5

1 0 3 2 . 0 6 1 0 0 9 . 4 1

1 0 2 4 . 1 6

1 1 2 8 . 5 9 1 0 9 9 . 5 3 1 0 8 8 . 3 6 1 1 5 5 . 0 7

1 0 3 9 . 7 8

1 0 8 9 . 5 1 0 2 1

1 0 8 9 . 8 6 1 0 9 2 . 3 2 1 0 7 1 . 5 1 1 0 7 1 . 6 3

9 8 6 . 9 6

1 0 7 1 . 6 2

1 0 8 5 . 9 41 0 8 5 . 9 1 0 2 8 . 8 5

1 0 4 4 . 2 7 1 0 8 3 . 9 4

1 0 1 9

1 0 6 8 . 4 8 1 1 0 5 . 7 2 1 0 8 0 . 4 9

1 0 1 7 . 7 5 9 8 0 . 9 8

1 0 4 5 . 5 31 0 5 0 . 3 91 0 1 9 . 7 1 1 0 3 2 . 5 5 1 0 3 9 . 2 1 1 0 4 1 . 0 71 0 3 7 . 8 3 1 0 4 4 . 4 5

1 0 9 6 . 4 2 1 0 3 5 . 7

1 1 6 0 . 7 6 1 0 5 3 . 1 5 1 1 0 7 . 4 9 8 3 . 9 2

1 0 0 2 . 9 2 9 6 9 . 8 3

9 9 7 . 6 4 1 0 0 31 0 0 6 .2 4 1 0 2 9 . 2 51 0 2 8 . 6 3 1 0 3 7 . 5 7

1 0 7 6 . 0 4

1 0 3 7 . 8 7 1 0 3 8 .7

1 1 6 8 . 7

9 9 7 . 1 5

1 0 9 7 . 5 1 1 0 9 5 . 8 7

1 0 4 0 . 8 7

1 1 5 2 . 1 1 1 1 5 2 . 2 2

1 0 6 6 . 2 41 0 0 3 . 2 4

1 0 1 2 . 4 7 1 0 1 3 . 8 6

1 0 1 2 . 2 1 1 0 1 1 . 3 4

- 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 1 0

T o s c a g r o u n d w a t e r l e v e l d i f f e r e n c e ( M a a r t 2 0 0 3 m b e l o w 1 9 9 0 w a t e r l e v e l s )

Observed

Observed Modelled Modelled

(23)

Scenario Prediction Scenario Prediction

Recharge (mm/a)

Abstracti on

Mm³/a

Water level reaction by 2014 (irt 1990 levels)

Management Decision

Scenario 1

0.4 - 1.5 winter 1.5 - 8.3 summer

16.1 Decline regionally 20 to 30 m Proximate to irrigation 60 to 110m declined

Not acceptable

Scenario 2

0.4 - 1.5 winter 1.5 - 8.3 summer

Acceptable with strong abstraction control.

Scenario 3

0.2-1.2 winter 1.2-6.7 summer

Acceptable with strong abstraction control.

Scenario 4

0.4 - 1.5 winter 1.5 - 8.3 summer

0 Full regional water level recovery Proximate to irrigation 10 m declined

Acceptable unconditionally

(24)

Water level reaction Water level reaction

Sen 1

Av recharge, high abstract Av recharge, high abstract

Sen 2 Sen 2

Av recharge, restricted abstract Av recharge, restricted abstract

Sen 3

Below Av recharge, restricted abstract Below Av recharge, restricted abstract

Sen 4 Sen 4

Av recharge, no abstraction Av recharge, no abstraction

(25)

Surface Area Irrigated Surface Area Irrigated

Tosca abstraction 1994 to 2004

1303

188 2067

90

2001

90

1927

90

1799

90

1154

72

1078

42

788

0

706

0 134 0

500 1000 1500 2000 2500

03_04 2003 03_02 2002 02_01 2001 01_00 2000 00_99 1999 99_98 1998 98_97 1997 97_96 1996 96_95 1995 95_94

Year and season

surface area irrigation (ha)

(26)

Predicted water level contour Predicted water level contour

- 1 1 0 - 7 0 - 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 1 0 2 0 3 0 4 0 5 0

Senario 1 Senario 1

Winter 2009

Winter 2009 Winter 2009 Winter 2009

Senario 2 Senario 2

Winter 2013 Winter 2013 Winter 2013

Winter 2013

(27)

Predicted water level contour Predicted water level contour

- 1 1 0 - 7 0 - 6 0 - 5 0 - 4 0 - 3 0 - 2 0 - 1 0 0 1 0 2 0 3 0 4 0 5 0

Senario 3 Senario 3

Winter 2009

Winter 2009 Winter 2009 Winter 2009

Senario 4 Senario 4

Winter 2013 Winter 2013 Winter 2013

Winter 2013

(28)

-100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0

91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06

waterlevel (mbs)

G39684 RU3 Distance from abstraction Recharge zone G39667 RU2 no abstraction Recharge zone

G39670 RU2 no abstraction Intermediate Zone

G39663 RU1 Distance from abstraction Intermediate zone

G39677 RU1 Distant from abstraction Intermediate zone

G39671 RU1 Distant from Abstraction Intermediate zone

G39685 RU1 Proximate to intensive abstraction Intermediate zone G39687 RU1 Distance from abstraction Intermediate zone

G39674 RU1 Proximate to abstraction Intermediate Zone

G39693 RU1 Distance from abstraction Discharge Zone G39673 RU1 proximate to

Water level reaction

(29)

Competition for water

(30)

Carting water

(31)

Risk based on water level decline Risk based on water level decline

V e r g e l e e

T o s c a

2 3 . 7 0 2 3 . 8 0 2 3 . 9 0 2 4 . 0 0 2 4 . 1 0 2 4 . 2 0 2 4 . 3 0 2 4 . 4 0 2 4 . 5 0

- 2 6 . 1 0 - 2 6 . 0 0 - 2 5 . 9 0 - 2 5 . 8 0 - 2 5 . 7 0 - 2 5 . 6 0

A r e a s n o t c l a s s i f i e d d u e t o l a c k o f i n f o r m a t i o n

L o w r i s k a r e a s

E x p e c t e d r e g i o n a l w a t e r l e v e l d e c l i n e l e s s t h a t 1 0 m W a t e r l e v e l d e c l i n e c o u l d b e i n c r e a s e d d u e t o l o c a l a b s t r a c t i o n

M o d e r a t e r i s k a r e a s E x p e c t e d r e g i o n a l w a t e r l e v e l d e c l i n e s u p t o 2 5 m

H i g h r i s k a r e a s

E x p e c t e d s e a s o n a l a n d r e g i o n a l w a t e r l e v e l d e c l i n e u p t o 5 0 m d u e t o p r o x i m i t y t o i r r i g a t i o n P o s s i b l e g r o u n d s u b s i d a n c e a n d s i n k h o l e f o r m a t i o n E x c e p t i o n a l H i g h r i s k a r e a s E x p e c t e d s e a s o n a l a n d r e g i o n a l w a t e r l e v e l d e c l i n e e x c e e d i n g 5 0 m d u e t o p r o x i m i t y t o i r r i g a t i o n P o s s i b l e g r o u n d s u b s i d a n c e a n d s i n k h o l e f o r m a t i o n

(32)

In f o r m a t io n f r o m t h e R e g is t r a t io n F ile r e V a l i d a t i o n P r o g r e s s R e p o r t u s in g

S a t e llit e im a g e r y A e r ia l P h o t o s R e p o r t s f r o m a r e a D e p a r t m e n t a l o f f ic ia ls E x is t in g r e c o r d s

N o t ic e t o u s e r t o a p p ly

f o r v e r if ic a t io n s e c 3 5 ( 1 ) A p p lic a t io n f o r m

R e t u r n d a t e E n t it le m e n t w ill la p s e if n o a p p lic a t io n r e c e iv e d

D e liv e r p e r s o n a lly o r r e g is t e r e d m a il

A d d it io n a l in f o r e q u ir e d S e c t i o n 3 5 ( 2 ) & ( 3 )

V A L ID A T IO N O F E X IS T IN G L A W F U L U S E IN T E R M S O F S E C T IO N 3 5

B l a t a n t u n l a w f u l w a t e r u s e

W a t e r u s e s t a t u s

In f o r m la w f u l u s e r o f r e s u lt o f t h e v e r if ic a t io n

Y e s

N o N o R e g i s t r a t i o n

L e t t e r C L a t e R e g is t r a t io n

L e t t e r G

L e t t e r A

R e g i s t e r e d i n f o r m a t i o n n o t a c c e p t a b l e

In f o r m u s e r o f r e s u lt o f t h e v e r if ic a t io n

U s e r s a g r e e s

W A R M S E d it

W a s a p p lic a t io n r e c e iv e d in t im e s e c 3 5 ( 2 ) ( c )

L a t e a p p lic a t io n c o n d o n e d s e c 3 5 ( 6 )

S u f f ic ie n t in f o r m a t io n R e q u e s t a d d it io n a l

in f o r m a t io n s e c 3 5 ( 3 ) ( a )

D e t e r m in e e x t e n t a n d la w f u ln e s s

s e c 3 5 ( 4 )

G iv e a p p lic a n t o p p o r t u n it y t o m a k e r e p r e s e n t a t io n s

s e c 3 5 ( 3 ) ( d ) N o

C o n f ir m e x is t in g la w f u l u s e Y e s

W a s t h e r e p r e s e n t a t io n

s u c c e s s f u l

Is s u e d ir e c t iv e t o s t o p u n la w f u l u s e

s e c 5 3 ( 1 )

N o

N o In f o r m u s e r t o s t o p

w a t e r u s e s e c 3 5 ( 5 ) ( a )

L e t t e r C Is e x is t in g u s e la w f u l?

L e t t e r D

L e t t e r F Y e s N o

L e t t e r B Y e s

N o

Y e s Y e s

R e g i s t e r e d i n f o r m a t i o n a c c e p t a b l e

Section 35 Section 35 verification verification



ID unauthorized user ID unauthorized user ---Sat images, Field ---Sat images, Field

inspections inspections



Notify user and request to Notify user and request to provide information

provide information



Accept info or give 2 nd Accept info or give 2 nd opertunity to give info opertunity to give info



Accept info or issue Directive Accept info or issue Directive



Inspect compliance with Inspect compliance with Directive

Directive

(33)

Name user REG NR VOLUME REG Date

bought Farm Farm

Area General Auth Total

Irri

Correct volume crop factor

New permitted

use RU Sat Image Jan 1999

Sat Image Mar 2002

(Ha) Remove

ha Suggested actions

M. Theron 25001514 277900 1997 Millbank 428.5 25710 50 404000 25710 1 No 50 45 Cut back to GA. Directive issued 5 Ha Fanie Griesel

Trust 10082527 200000 2000 Belvidere 1096 65760 40 456000 65760 1 No 25 13 Cut back to GA. Directive issued 12 Ha

Emtron Bdy 10081216 335650 1999 Grassbank 785.8057 47148 55 520500 520500 1 7 50 0

Total use transferred from Forres. May continue

C.E. le Roux 25007117 152100 2000 Westward Ho 1892.43 0 60 666000 0 1 No 60 60 No GA in D41C, Cut back to 0. Directive issued.

P Haasbroek License

application 0 2001 Marlborough 713.6 42816 50 375000 42816 1 No 50 45

Cut back to GA. Terminate current arrangement. Enforce directive 04/2002.

New Directive issued 5 ha

J.J. Hayward 25008679 282900 1997 Forres 1590.975 95458 30 441000 95458 1 No 30 14 Cut back to GA. Directive issued. 16 Ha

J.H. Fourie 10081323 255400 1988 Hurstpark 2494.751 149685 60 440000 60240 1 40 60 0 The use registered as GA on Blanco farm.

No action

Mr. P.W. Beyer 10081234 798200 2003 Harcourt 1241.4 74484 140 1174000 439000 1 30 60 30 Remove 30 ha, rest legal. Directive issued.

Leniesdeel Trust (Jan

Fourie) 10081350 655100 1995 Harcourt 620.7 37242 120 935000 777500 1 106 146 40 Remove 40 ha, rest legal. Directive issued Hulp Alleen

Familie Trust 25006010 95850 2000 Genade 471 28260 18 130500 130500 3 No 18 0 Cut back to GA. Considered information.

Declared as existing legal use P.A.

Theunissen 10081243 182400 1998 Nokani 293.4542 17607 30 225000 225000 3 No 30 0

Cut back to GA. Considered information.

Declared as existing legal use E.C.

Grobbelaar 10081369 484060 1992 Robyn 2254.6 135276 66 682200 682200 3 52 52 0 All legal no action

Mr. F.J.

Hamman 10081314 66570 1994 Sentac 0 24 231700 231700 3 19.8 28.3 4 Remove 4 ha, rest legal

Mr. P.E. Kriel 10081261 89180 1999/10/01 Millbank 856.5315 51392 17.5 124250 124250 3 6 15 0 Motivations justify planned to irrigate area,

quotations supplied, no action

Mr. F. Barnard 10081289 383750 Woodborough 1551.1 93066 50 555000 444000 NA 40 50 0 Moved irrigation, Remove registered use

from Elchester

4259060 Volume Reduced 3495516 7360150 3864634 Total 192 674.3 251 Ha reduced

Volume Reduced RU1 3384516 5411500 2026984 1 183 441 247 Ha reduced RU1

Volume Reduced RU3 little 1393650 1393650 3 118 193 4 Ha reduced RU3

Identified unauthorized water

users (15) ruled unauthorized (7)

(34)

(35)

Legend Legend

Id unauthirized Id unauthirized

Ruled unauthorized

Enforced to comply

(36)

Compliance and enforcement Compliance and enforcement

of water use of water use

Issue Directive

Comply Not

comply

Do work to rectify offense

Lodge criminal case

User gives permission Notify user:

 pumps to be removed

 cost to be recovered

 holes to be sealed

User does not give permission Do work to rectify offense

User gives permission

Remove pumps Remove own

Get warrant Get police protection

Remove pumps

(37)

Convoy with police protection

Sealed

borehole and power supply Removal of pumping equipment

Serving of court order

(38)

Water authorization actions Water authorization actions

Description Irrigation

area (Ha)

Volume

(million m

³

/a) Registered irrigation surface and volume 2076 18.2

Termination of reserved use -260 -2

Termination of unauthorized use -451 -2.0

New water use authorization 124 0.93

Total irrigation areas after NWA reduction processes

1495 15.17

The resource is still over allocated by 4 million m

³

of water annually.

(39)

DWAF regional office Kimberley responsibility

Determine the Reserve Determine resource potential Register all water use

Verify registered water use Authorize new water use Compile a schedule of use

Determine measures to contain use

CMA responsibility

Issue WUA with schedule of use and users Set conditions for new water use

Support WUA in intervention with individual users

Enforce measures to contain water use like restrictions

Tosca Molopo WUA responsibility

Compile a business plan

Communication with individual water users Issue water use to individual users consistent with schedule of users

Plan, police and monitor water use activities of individual users

Issue directives to individual users not complying with plan

Report total water use to CMA

Establish a resource water level monitoring programe

Initialize additional water resource studies to determine resource potential

Investigate and solve individual water users complaints

Contribute to new water use authorization

Individual user responsibility

Clarify allocated volume and authorization/ use conditions

Plan annual water use activities to comply with all conditions associated with water use

Establish a water monitoring plan to measure use, water levels, precipitation

Report water use to the WUA annually Payment of all water use charges

Extend of Tosca Molopo operation

Land of ±200 000ha valued at ±R200M Developed irrigation of 2000 ha valued ±R52M

Stock valued ±R40M

Monitoring network of 100 boreholes Schedule of 53 registered irrigators Water resource with estimated capacity 1600 ha

irrigation or 11.1 M m³

39 monitoring boreholes valued at ±R1M

(40)

Conclusion and recommendation Conclusion and recommendation



Aquifer stressed with declining water levels due to over allocation Aquifer stressed with declining water levels due to over allocation of the resource by 40 to 60 %.

of the resource by 40 to 60 %.



At current rates decline would prevail putting water provision, At current rates decline would prevail putting water provision, capital investment, the resource and the environment at risk.

capital investment, the resource and the environment at risk.



Allocation and abstraction control with a restriction of 40% for Allocation and abstraction control with a restriction of 40% for the next 5 years.

the next 5 years.



Participative management through a WUA. Participative management through a WUA.



Monitoring to refine recharge estimates, resource status and GM. Monitoring to refine recharge estimates, resource status and GM.

