Zandvlei Trust

Westlake Wetlands work party November 2009.

A Working for Wetlands team has commenced work on the Keyser's River, clearing hyacinth from the Military Road bridge downstream towards the railway bridge. The area above Military Road is clear and we have been working upstream. This means that there is only about 400 meters of river to be cleared.

Once this work is completed then both the Keyser's and the Westlake Rivers will be clear of hyacinth.

The remaining infestation is in the central reed beds. Now that the weather has warmed up DWAF will be coming on Wednesday 11th November to release a biological control, a moth, into the central reed beds. We will monitor this and continue to hand clear this area.

One beneficial element of the hyacinth was that it took up a lot of nutrients from the water. With the removal of the hyacinth there is now an explosive growth of parrot's feather and watercress together with a major algal bloom in the Rutter Road pool area. Some 60% of the water surface is covered at the moment. There is the potential for a biological control agent being released to clear this but this has to be finalised.

There really would be benefit in convincing the Council to divert water from the Keyser's and Westlake Rivers through the reed beds as high up stream as possible. This would remove nutrients, slow the water flow and thus reduce siltation in the main Zandvlei and provide a natural litter trap that could be cleared mechanically from time to time.


photograph by Duncan Barson                                                     photograph by Duncan Barson

An indication of the size and density of hyacinth.       Battling to into the dense reed beds to release the 
                                                                              control agents in the correct location.


photograph by Duncan Barson                                                     photograph by Duncan Barson

Releasing the moths onto the Kariba weed or            Introducing the control agent on treated hyacinth.
Water letuce.


photograph by Duncan Barson

The DWAF personnel taking the control weed to an area to release the agents to do their work.


photograph by Duncan Barson                                                     photograph by Duncan Barson

An indication of how dense some areas are in the reedbeds.


photograph by  Steve Davis

What it looked like at the railway bridge before the cleanup in 2004.


photograph by Steve Davis

What it can look like again. This was after a cleanup in 2004. This is the confluence of the Keysers and Westlake Rivers, looking towards Main Road, Lakeside from the railway bridge.


photograph by Rosemary Barson

The Rutter Road Pond with the algae boom mentioned by John. The photograph was taken from Muizenberg near Steenberg peak.

John Fowkes.

                                                                                                                                             

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