wpe6.jpg (28851 bytes)
 

 

High rainfall occurred in the catchment of the Leeuspruit which is a tributary of the Elands river.  (See map) Continuous rainfall over a period of 5 to 7 days resulted in the soil to be saturated and together with the heavy precipitation on the 10/12/2000 caused the extraordinary  run-off in the Elands river. (See rainfall figures) According to evidence several small farm dams could have broken which contributed to the high flood peak, although it was not the main cause of the flood.  

X2H015 Elands River at Lindenau is a river gauging station near the confluence of the Crocodile river and the Elands river. Preliminary indications show that the flood peak on the 11 December 2000 was between 800 - 900 m3/s and represents a height of 4.73m. Pervious floods of this magnitude occurred in 1989 with a flow of 685 m3/s which represented 17 % of the regional maximum flood (RMF).  The river section was calibrated in 1990 to determine this flow. The RMF for this region is calculated to be 3942 m3/s and indicates that the resent flood represent 23% of the RMF. The river section has to be re-surveyed  and calibrated to determine the flow of this flood because of changing  vegetation in the river sections. 

 

Rainfall during December in Waterval Boven

Day

4

5

7

9

11

17

15

Rainfall (mm)

12

28

25

13

40

6

5

Rainfall during December in Machadodorp

Day

2 3 6 7 9 10 12 14
Rainfall (mm) 5 19 34 34 14 83 8 12
 

 

Flow Record from 1960 to 2000 wpe63.gif (20139 bytes)
N4 Road bridge near Waterval Boven wpe51.jpg (13071 bytes)
X2H015 Elands River at Lindenau.  

River gauging station approximately 20 km downstream of Waterval Boven.

wpe50.jpg (14898 bytes)
X2H015 Elands River at Lindenau.

During flood peak

wpe47.jpg (14152 bytes)
X2H015 Elands River at Lindenau.

N4 Road bridge and Instrument tower

wpe53.jpg (11825 bytes)
Elands River wpe6A.jpg (10975 bytes)
 

 

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