Forthbank Wind Energy Development - Partnerships for Renewables

Forthbank Wind Energy Development
Drainage
13.6.7 The implementation of Sustainable Urban Drainage Systems (SUDS) as opposed to
conventional drainage systems on the proposed wind energy development will provide several
benefits by:
• reducing peak flows to watercourses and potentially reducing risk of flooding
downstream;
• reducing the volumes and frequency of water flowing directly to watercourses;
• improving water quality by removing pollutants;
• reducing potable water demand through rainwater harvesting; and
• replicating natural drainage patterns, including the recharge of groundwater so that
base flows are maintained.
13.6.8 Where appropriate, SUDS measures have been incorporated into the water management
methods discussed in the following sections.
13.6.9 Where there is a high risk of oil contamination identified by the infrastructure contractor, it may
be appropriate to integrate an oil separator into any SUDS measure. The implementation of
the type of SUDS measures will be dependent upon detailed site and hydrological
investigations.
13.6.10 On-site artificial drainage serving the development will be carefully placed to prevent damage
to the soil.
Geotechnical Design
13.6.11 Detailed geotechnical design will be undertaken for each turbine location, access track,
laydown area and the construction compound, and will ensure that the stability of the landfill
waste is not compromised. This will be based on the location-specific mechanical
characteristics of the ground conditions and the morphology of the underlying strata (i.e.
landfill, made ground, superficial deposits or bedrock). Targeted ground investigation will
therefore inform a detailed design utilising current and location specific geotechnical data.
13.6.12 During any levelling in the landfill area, the capping material should be separated from landfill
material and replaced following levelling. Excavations for turbine bases should attempt to
reduce the need for landfill cap removal. However, where landfill cap removal is unavoidable,
a clay seal/bentonite will be placed at the base of the excavation.
Turbine Foundations
13.6.13 Due to the potential for release of landfill gas and air ingress into the landfill during construction
and operation intrinsically safe operating plant will be used. The potential for gas accumulation
November 2010 Chapter 13 Page 32
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