Dam Levels

Last updated: 11 December 2017

Ave all 29.07% of total combined capacity 

DAM

KOUGA

CHURCHILL

IMPOFU

LOERIE

GROENDAL

CAPACITY

11.95%

20.60%

47.61%

94.38%

54.47%

VOLUME OF WATER

15 045 Ml

 7 261 Ml

50 346 Ml

 2 856 Ml

 6 340Ml

TOTAL

81 848Ml


Please note that although the level of Loerie dam has increased, it is a small balancing dam
and unfortunately, does not change the water disaster situation Nelson Mandela Bay is currently in.

Please click here for water saving tips. In SEARCH BOX, type in WATER.

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.  The month of June 2017 saw the lowest rainfall of the last 20 years with only 2.5mm precipitation for the entire month.

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

72.58

1.4

307.91

10

Aug-16

71.88

0.7

314.77

11

Sep-16

71.70

0.2

305.60

12

Oct-16

68.14

3.6

301.73

13

Nov-16

64.17

3.9

303.73

14

Dec-16

58.25

4.9

303.01

15

Jan-17

53.53

5.2

293.53

16

Feb-17

48.74

4.4

290.49

17

Mar-17

44.23

4.5

287.00

18

Apr-17

40,24

3,99

284.02

19

May -17

37.85

2.39

258.99

20

Jun-17

34.85

3.00

267.60

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.

In May 2017 consumption dropped below 260Ml/day, this figure shows the possibilities.

 

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 NMBM

Trends 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 25% from 1 July 2017.

 

FIGURE 5: RECENT DEMAND GRAPH SHOWING RESTRICTIONS



Figure 5 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.

 

Some recent photos of the tail end of Churchill dam: