The Visual Design Window
The designer can now see and manipulate a 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.
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.
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.
Ring Soakaway Surrounding Fill and Margin Variable
Version 4 also includes 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.
Flat Soakaway or Base Infiltration Option
In Version 4 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.
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.
AutoCAD Drawings
AutoCAD drawings of typical soakaway arrangements are
included in the full version of Visual Soakaway Design
4. These can also be freely downloaded
from our Help pages.
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£325, £381.87
inc VAT
480.00,
$635.00