In addition to a comparison of the practical aspects of seepage
remediation techniques, the comparison of costs to implement
and maintain the remediation is also important. Preliminary costings
of the potential techniques are required to enable an adequate
initial comparison, including any other potential options determined
in 7 Consider all possible options.
Costs of remediation techniques given on this website are based
on figures quoted in the literature and first-hand experience gained
during installation as part of the IAL trials.
Costs are likely to vary depending on:
Developments in material properties and installation
techniques
Availability of materials within Australia (or
overseas), competition within the market, and exchange
rates
Availability of skilled labour and equipment, and competition
within the market
The scale and extent of the remediation
works
The location of the works.
Cost examples on this website should be used only for comparison
between techniques. Detailed costs need to be prepared on a
case-by-case basis.
Depending on the technique and the availability of labour with
the appropriate construction experience, cost estimates for
installation could be prepared using either an in-house engineering
estimate
or a quotation from a supplier or contractor.
Factors influencing the cost of installation include:
Site preparation (e.g. reprofiling channel, removing
debris)
Quantity of material required. Estimates need to
be made for the final area of liner or other material
required, rather
than
just area of the existing profile of the channel. For example,
in the case of exposed and covered flexible membrane liners,
the channel profile needs to be reshaped and the material
needs to
be secured in anchor trenches either side of the channel,
thereby increasing the area of material required.
Supply and
transport of materials to site.
Equipment required to
handle and install materials.
