All methods of seepage remediation require ongoing maintenance
to ensure that the remediation performs for its expected life.
Typical maintenance requirements are covered in the Table 1 Channel
seepage remediation decision matrix and Channel seepage remediation
techniques.
Maintenance programs should include maintenance and operation of
the waterway area. As discussed in 2 Determine remediation objectives,
the implications of channel maintenance should be assessed when
selecting a seepage remediation option. Changes to maintenance
practices are often required following seepage remediation.
Programs should be developed and distributed for each different
technique implemented, including a summary of the characteristics
of the technique and consequences of damaging the lining material,
so that operations staff are aware of maintenance requirements.
Maintenance strategies could include:
Retention of water in the channel during the off-season
to reduce UV exposure and reduce the risk of hydrostatic pressure
lifting
the liner
Fencing to prevent stock and wildlife access
Weed eradication
program to prevent weed growth (and hence need for removal)
and damage to liner
Modified desilting practices (e.g. sludge
pumps for exposed liners or laser-guided excavators for buried
liners)
