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Visual Soakaway Design Version 4 incorporates a more logical
and customisable user interface with some added design features...
The Visual Design Window
The designer can now see and manipulate a 3D visual representation
of either a trench or ring soakaway. The visual soakaway can
be moved anywhere within the window and designed in real-time
thus reducing the total design time.
Soakaway Maintenance Schedule
Due to the importance of maintenance, we have produced a
schedule which can be printed off and kept on file to allow
the useful life of the soakaway to be monitored.
Filter Trench Design Option
In addition to the soakaway design functionality, the designer
may opt to design a filter trench. A filter trench is essentially
the same as a soakaway except that a specified portion of
the surface runoff is allowed to discharge through an overflow
pipe. In this way, surface water from a site can be treated
by infiltration through the fill media prior to discharge
to a watercourse and also removes the need for total storage
within a traditional soakaway.
Flat Soakaway or Base Infiltration Option
In previous versions of Soakaway Design, the designer was
restricted to the fact that the design only allowed trench
soakaways to exfiltrate water through its sides (and not its
base) to half the effective depth.
In Version 3 the designer has the option of including the
base of the trench soakaway in his/her design, thus making
it possible to analyse the behaviour of a permeable surface
for surface water drainage. eg. porous block paving.
Failure Depth of the Ring Soakaway
Previously the failure depth of ring soakaways was set to
4 metres. This is now entirely at the designers discretion
and can be modified at design time. However, the failure half
emptying time is still set to 24 hours.
 Ring
Soakaway Surrounding Fill and Margin Variable
Another new feature in Version 4 is the option of including
the granular fill surrounding the ring soakaway for storage
purposes. This allows for a slight reduction in depth in the
finished design.
The Margin variable has been introduced to account for the
width around a Precast concrete ring soakaway which may be
filled with granular fill material. The Margin variable is
set in the Design Options window as shown below...
Z1 and Z2 Factors
In keeping with the design methodology of the BRE 365, the
design rainfall can be calculated to a more accurate statistical
level using the Z1 and Z2 factors for various regions of the
UK. Click here to
learn more.
Factor of Safety
The factor of safety coefficient has been included to allow
the designer greater margins of comfort in sites where flooding
is an issue. The infiltration rate of the soil is divided
by the factor of safety within the design calaulations and,
therefore, increases the overall size of the soakaway.
Soil Infiltration Table
This feature must be used with caution!
The table is provided
purely as a guide to allow for a rapid nominal design based
on an estimated infiltration rate. It is vital, for a soakaway
to work effectively for its design life, that a porosity test
is carried out on site.
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Visual Soakaway Design - Help