Healing Stonequarry Creek after the storm

Warragamba Panorama

Healing Stonequarry Creek after the storm

Posted on: 14.11.2016

Wollondilly Shire Council is committed to restoring Stonequarry Creek and is working collaboratively to improve the state of the creek now and in the future. A Community Field Day is scheduled for Sunday 20 November and Council invites anyone with an interest in Stonequarry Creek, or creek regeneration, to come and help “Heal Stonequarry Creek.”

During the Field Day members of the community can volunteer and take part in regeneration works along the creek. Activities planned for the day will be:

  • Helping to prevent erosion by planting bank stabilising vegetation, such as lomandra, carex and juncas which grow naturally in creek lines and are low growing hedges.
  • Trees will not be planted
  • Mulching around the bush tucker garden
  • Creek Tours
  • BBQ

Mayor for Wollondilly Judith Hannan said, “Council has heard the feedback from the community highlighting the need to clean up the creek and the community field day is a response to their feedback”

“We are taking all the steps necessary to regenerate the creek and have already completed work to remove debris and stabilise creek banks to reduce further erosion. The lower limbs of a number of trees have also been removed to prevent debris being caught.”

“Low lying shrubs will be planted to manage erosion along the creek. Tress will not be planted”

“An independent analysis of the rainfall data during the storm has been completed as the first part of an in-depth analysis of the storm event. This is so that we can gain a better understanding of the creek’s capacity to handle large volumes of stormwater flowing through it.”

Over the duration of the June 5 storm 334 mm of rain was recorded at the Stonequarry Creek rain gauge. During the most intense part of the storm over a nine hour period, the rainfall exceeded the 1 in 100 year Average Recurrence Interval storm for this part of the catchment.

Manager Infrastructure Planning Mike Nelson said, “The independent analysis of rainfall data has confirmed that what we experienced was a significant event. It has also confirmed that whilst the creek has vegetation, the creek flowed freely with little interference from the trees and vegetation.”

“The scale of the flows generated was too much for the capacity of the creek”
“Best practise for managing storm/rainwater runoff is to work with the environment rather than implementing constructed solutions.”

“ This combined with the results of the rainfall data analysis indicates that it is more effective to appropriately regenerate the creek rather than implement constructed solutions such as concrete channels which could make downstream flooding impacts even worse”.