In this issue



   - What’s to Come



Alice Departs

   - A New Chapter Begins



Frequently Asked Question

-  Recommended Tools



Tree Pits

   - Review



Wrap Up

   - See you next month


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Hello everyone and welcome to the September edition of “Keep Things Flowing”, the monthly newsletter presented by Storm Water Consulting.

In this month’s newsletter we bid farewell to one of the Storm team members, we answer another frequently asked question and we take a closer look at a Tree Pit stormwater quality improvement device.


Alice Departs

If you’ve ever called the Storm office you’ve probably heard the friendly greeting “Hello, Storm Water Consulting, Alice Speaking”. Unfortunately those words will not be heard after today as this is Alice’s final day at Storm. Over the past 7 years Alice has been an integral part of the Storm team and we wish her all the best on her new journey.


Frequently Asked Question


What is stormwater detention?


Stormwater detention is a method of detaining stormwater runoff so that an adverse impact is not created on downstream properties. An adverse impact could consist of increased peak discharges, increased flood levels, increased scour and erosion, damage to property or increased flood hazard. Typically stormwater detention is provided in the form of a detention basin or a below ground detention tank.

Development of a property often results in an increase in impervious site area, which creates additional runoff and increases the peak discharge from the site. On-site detention may be required if the downstream stormwater network does not have capacity to convey the increased peak flows. When developing a property it is imperative to understand the impacts that could be created downstream of the site and the potential civil matters that could arise if not addressed adequately. If you would like advice about a particular development please contact our office and we would be pleased to provide assistance.


Tree Pits

Earlier this month the Storm team attended a product information session presented by Ecosol representative Stephen Duncan. One of the products that Stephen spoke about was Ecosol’s Tree Pit. Figure 1.0 below shows what a Tree Pit looks like.

Figure 1.0 – Tree Pit


The Tree Pit is effectively a bio-retention basin in a box. Polluted stormwater runoff enters the Tree Pit through a grate at the surface and filters through filter media, removing key pollutants, before discharging through drainage pipes at the bottom of the system. A tree is planted in the filter media to assist with the removal of key pollutants. A sectional view of the Tree Pit is presented below.


Figure 2.0 – Tree Pit Section


The Tree Pit is useful for treating runoff from roads and carpark areas as the system can be incorporated into the footpath or verge design. Each Tree Pit is not designed to treat a significant catchment however they do remove phosphorous and nitrogen from runoff which is a significant benefit when a tertiary (cartridge-filter based) stormwater treatment device is otherwise needed.


If you require any more information on the Tree Pit or other water quality treatment devices please contact our office.


Wrap Up

We hope you enjoyed this month’s edition of Keep Things Flowing.

As always, Keep Things Flowing!

The Storm Team