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| 13 Undertake remediation works |
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Successful installation
Successful installation of remediation works is a key component
in reducing the seepage rate from a channel.
Issues that need to
be considered when developing a works program prior to construction
include the:
- lead time required for the supply and delivery of
material to the site;
- use of contract and/or RWA labour;
- period of time available
to undertake the remedial works; and
- the expected climatic
and site conditions which may influence the construction
method or schedule.
During construction, relevant
Quality Assurance procedures should be followed to ensure the placement
and quality of any lining material
or backfill meets the design requirements and specifications. Furthermore,
the type, location, elevation and thickness of any lining material
and/or backfill should be documented in the RWA’s Asset Management
System to enable authority staff to assess status of the remedial
works over its lifetime, and implement maintenance programs sensitive
to the location and type of liner.
IAL trials and the
literature show that benefits of the seepage reduction are not
fully achieved unless the lining is correctly installed. Expertise
of the personnel installing the lining and use of appropriate equipment
is a key factor in the achievement of a correct and successful
installation. Even for very small imperfections in channel lining
of 0.01% of the wetted area (e.g. holes, tears, poor seams), seepage
losses in experimental tests nearly reach that of the unlined condition
(Abdel-Gawad et al, 1993).
| Related
pages |
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Previous: 12 Select remediation technique
Next: 14 Develop and implement maintenance program |
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