08/1787 - Response to Information Request [As Published] · 132008.1787

 

Seahaven Development Pty Ltd- 9-19 Hastings Street Noosa QLD 4567 13

 

 

There are several methods to improving or increasing soil volume for root

growth and distribution:

1) Root Paths- done by installing narrow trenches filled with strip drain .
boards and good soil to guide roots underneath pavement to areas of :
natural soil with adequate volume.

2) Soil Trenches- arc long cnches connecting between trees in pavement
areas with a structural stab over the trench to support pavement.

3) Soil Vauits- arc cnclosurcs that keep roots contained and separated from
infrastructure and having a slab over the top to support pavement.

4) Sand or Amsterdam Soil- is a coarse sand with added clay and organic
matter, allowing compaction for pavement support, but allowing for some
settlement of pavement overtime. Water supply and design issues are
extremely important in this method, including the acceptance of pavement
settlement.

5) Structurat Soils-are a mix of rock and soil with a high air filled porosity
that allow compaction for pavement but still having adequate air for root
growth. These soils require design by an cngincer working in conjunction
with a soil scientist that is experienced with structural soils.

6) Sand/Aggregate Structural Soils- are a new method currently being used
in Germany. They are a combination of the Amsterdam and structural soil :
methods. “

7) Suspended Pavements/Structural Cells- this:method aims to suspend the .
pavement above the soil using a pier and beam system, either engineer
designed or a prefabricated system. An example of a prefabricated system
is the structural cell system by DeepRoot Partners LP
(yveww.deeproot.com) as shown in Diagram No 1 and 2 (Urban 2008, page
308, figures 2.6.30 & 2.6.31).

 

 

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Soil Votume -
Tree Opening - 140 CF a

Structural Cells - 1380 CF i
1820 CF
.
Figure 2.6.30. Structural cells are Ine vedy systara that can e
provide sustainable soil valuine wilh Ihe space of a typical . 3

  

ark solscapre,

 

 

 

 

Diagram Na I- showing the use of structural cells to improve soil volume ~
(Urban 2008, page 308). CF stands for cubic feet.

 

 

Leaf and Limb Horticultural ConsultancyO
Prepared by Samuel Cowie 29" of January 2009 . y