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  Dam Levels

Last updated: 22 June 2017

Ave all 35.54% of total combined capacity 

DAM

KOUGA

CHURCHILL

IMPOFU

LOERIE

GROENDAL

CAPACITY

18.45%

10.55%

62.07%

42.89%

53.18%

VOLUME OF WATER

23 234 Ml

3 717 Ml

65 641 Ml

1 298 Ml

6 190 Ml

TOTAL

100 080 Ml


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FIGURE 1: CHURCHILL RAINFALL VS 20 YEAR AVE 

Since December 2015 the catchment areas have experienced very low rainfall figures. The graph below indicates the monthly rainfall at Churchill Dam compared to the average rainfall at Churchill dam over the last 20 years. One can see the very low rainfall over the last year and in particular the last 5 months compared to the 20 year average.

Churchill dam

TABLE 1: DAM STORAGE LEVELS AND CONSUMPTION

 

Month

Ave. Dam Level (%)

% change

Average Daily Consumption

(Ml)

1

Nov-15

100.0

-

320.53

2

Dec-15

96.9

3.1

326.49

3

Jan-16

91.7

5.2

341.05

4

Feb-16

86.8

4.9

325.65

5

Mar-16

83.4

3.4

315.10

6

Apr-16

79.3

4.1

318.53

7

May-16

76.5

2.8

301.62

8

Jun-16

74.0

2.5

295.34

9

Jul-16

72.6

1.4

307.91

10

Aug-16

71.9

0.7

314.77

11

Sep-16

71.7

0.2

305.60

12

Oct-16

68.1

3.6

301.73

13

Nov-16

64.2

3.9

303.73

14

Dec-16

58.3

4.9

303.01

15

Jan-17

53.1

5.2

293.53

16

Feb-17

48.7

4.4

290.49

17

Mar-17

44.2

4.5

287.00

18

Apr-17

40,7

3,5

284.02

November 2015 was the last time our dams were filled to 100% capacity. Note how water demand management has taken consumption down well below the 300 Ml/day mark.

The figures in the above table are indicated graphically below.

FIGURE 2: STORAGE CAPACITY OF NMBM’S SUPPLY DAMS

Rainfall - April 2017

The figure above compares the current drought to the previous one we had in 2009/10.

The Municipality holds regular meetings with the Department of Water & Sanitation as part of the Algoa Reconciliation Study, to discuss dam levels, drought scenarios and water restrictions.

FIGURE 3: AVERAGE DAILY WATER CONSUMPTION FOR NMBMTrends April

The blue line indicates an estimate of what the daily consumption would be if no water conservation & demand management measures were introduced.

The green line is what we actually consumed and in the last column you will see the targets we must reach according to the restrictions set by the DWS. 

The Municipality has been restricted by DWS on its water allocations by 15% from 1 February 2016. DWS are in the process of increasing water restrictions by 22%.

FIGURE 4: RECENT DEMAND GRAPH SHOWING RESTRICTIONS



Figure 4 shows that there was a growth after the previous drought, but is currently on a decline.
The green line indicates the available safe yield we have available, and anything above this line would indicate over abstraction.
The yellow line shows the sharp decline in consumption we managed to attain in the previous drought.