Environment, Local News

Marawhara & Wekatahi Streams realignment

0 Comments 08 December 2014

Realignment of the Marawhara and Wekatahi streams @ North Piha

Realignment of these two streams at North Piha is due to take place during low tides starting 15th of December.  It does depend on weather.

The following from AC Parks West

In March 2013 the Waitakere Ranges Local Board agreed to put trigger points in place that monitor the need to retrain the Wekatahi and Marawhara Streams. The trigger points were determined by Auckland Council Coastal Management Services and Local & Sports Parks West, and allow for short term movement in the stream and dune profiles, while also retaining a significant dune buffer against potential storm impacts.

The streams have meandered south again and have now reached the respective trigger points. Consequently, realignment works to retrain the two streams into separate channels will be required in the near future.

Auckland Council intends to carry out retraining works prior to Christmas to avoid works during the busy summer period and prevent the potential loss of the protective dune buffer to the South of the two streams.

The retraining works will involve the creation of two new channels for the streams to exit directly to the sea. These works will be similar to those carried out in 2012 where the sand removed to create the new channels will be used to infill existing channels. The intent this time is to deposit more sand between the streams in order to shift the stream merge point seaward over time and potentially avoid future retraining exercises.

In accordance with coastal management best practice, the minimum physical works will be undertaken to achieve the realignment. Works are predicted to take approximately 5 days.

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