Forthbank Wind Energy Development - Partnerships for Renewables

Forthbank Wind Energy Development
dispose appropriately. The gradient at storage locations will be considered to avoid further
erosion or potential sediment transport into watercourses.
Site Tracks
13.6.22 The construction of new tracks will vary depending on the ground conditions. Cut tracks will be
constructed on harder ground, where possible.
13.6.23 The tracks will be constructed with sufficient camber or crossfall to minimise ponding of surface
water on the track surface. Where necessary, surface water runoff will be directed into
infiltration trenches and/or swales and settlement lagoons. These SUDS measures will treat
and attenuate the runoff before discharging back into the natural drainage network. If
permanent infiltration trenches, swales and drainage ditches are to be constructed, they would
require outlets at frequent intervals to reduce the volume of water collected in a single channel,
thus reducing the erosive potential and allow runoff from upslope of a track to pass underneath
the access track. These measures will minimise the risk of erosion of the track surface and the
subsequent risk of sedimentation.
13.6.24 Where access tracks are situated on the existing landfill, runoff will be directed to a leachate
management system before being attenuated and discharged to the adjacent watercourses.
13.6.25 Where access tracks are constructed across natural areas of drainage such as flushes and
springs, drainage measures, such as pipe culverts will be installed under the access track to
allow the run-off to continue to follow its natural course.
Turbine Hardstandings
13.6.26 Turbine hardstandings will be designed in such a way to direct flow into infiltration trenches or
the leachate management system, depending upon where they are located. These measures
will allow the treatment of runoff before gradually discharging back into the natural drainage
network.
On-Site Buildings
13.6.27 On-site welfare facilities need to be adequately designed and maintained to ensure all sewage
is disposed of appropriately. This disposal may take the form of a connection to the existing
sewer network, an on-site septic tank with soakaway, or a closed unit with tankering off-site for
disposal, depending on the suitability of the site for a soakaway, with authorisation from SEPA.
13.6.28 Buildings will be designed with SUDS measures to treat and attenuate flows to greenfield
levels, prior to discharge to the surrounding hydrology.
13.6.29 The sizing and location of the various elements of the drainage system will be influenced by
the topography, gradient and catchment runoff characteristics and the volumes of runoff
intercepted by each drain. These factors will be determined at the detailed design stage.
November 2010 Chapter 13 Page 34
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