Summary
Introduction
Purpose of project
Streetscape renewal
Installation type
Other
Designed planting pits to provide adequate root volume which will allow trees of large scale and include stormwater water polishing in infiltration pits
Tree planting date
2011 approx
Tree species
Quercus palustris (Pin Oak)
Botanical name (Common name)
Number of Trees Planted
8
Tree Stock Size at Planting
100+ or ex-ground
Number of Trees Surviving
6 + 2
Survival Assessment Date
April 2019
Features
Other WSUD type
Owner of Site
Blue Mountains City Council
Location Details
Location Address
Great Western Highway, Lawson
Corner of Staples Crescent & GWH , Lawson - continuing for 80 metres west.
Council/LGA
Blue Mountains CIty Council
Technical Detail
If you require details not available here, see contact details.
Case Study Description
The RMS undertook a progressive upgrade in stages of the Great Western Highway from Lapstone to Katoomba from about 1990 to 2016. From around 2009-2012 it undertook the upgrade through the town centre of Lawson, involoving the demolition of the commercial centre shops, widening of the Highway and significant landscaping. This project involved the installation of a carpark in front of the new shopping centre separated from the highway shoulder by a narrow landscaped strip. A decision was made by the RMS, with the encouragement of Council's Urban Designer and the RMS' consultants HBO+EMTB, to construct the planting strip to provide adequate root volume, deep aeration and stormwater polishing.
Design &/or as constructed detail
Depth of Engineered Space
1.3
Volume of Engineered Space
250M3 approx
Drainage Type
slotted pipe in base of planting pit - see attached drawings
Drainage Type Resource/Image/Document
Surface Treatment
Growing Media Detail
Soil MIx A (to 300mm depth): 30% imported topsoil, 50% coarse sand, 20% organic matter, + amendments
Soil mix B: (subsoil)40% imported topsoil, 60% coarse sand.
Note detail included on plan V01
Surrounding Site Soil Detail
Hard paved surface with compacted subgrade as per engineering details
Surrounding site soil detail Resource/Image/Document
Watering Regime
None
Maintenance Detail
24 months establishment maintenance – none subsequently. Note two trees at the eastern end were demolished buy a car and have been replaced.None
Non-Technical Detail
Challenges Overcome
Justifying the need for tree trench space
Stakeholder Feedback
Positive
Stakeholder Support for future projects of this kind
Yes
Funding Source
RMS Great Western Highway upgrade - Lawson stage 2
Project Cost
Unknown
Partners/Sponsors Information
Would not have been possible without an enlightened RMS project manager and an excellent consultant