environmental statement - Rotherham's Online Application for ...

FLOODING FROM SURFACE WATER DRAINAGE
13.34 Detailed assessment of the risk of flooding from surface water drainage
and the impact of the proposed development on surface water runoff is
included in the FRA report (Appendix 9). The site drainage system is
designed to ensure that the site is not at risk of surface water flooding in
response to rainfall events up to 1 in 200 years magnitude.
13.35 The assessment of the impact of the proposed development on surface
water runoff from the site demonstrates that as the development will not
result in any change in the local surface water regime, it will have no
adverse impact on flooding or flood risk within the site or the surrounding
area. It is also demonstrated that as there are no above ground structures
with the potential to impound surface water, which will continue to drain
naturally to Ulley Brook, the site itself is not at risk of surface water
flooding.
13.36 The FRA has demonstrated that the proposed development area is
located wholly in Flood Zone 1 and therefore the proposed development
meets the requirements of the Sequential Test and Rotherham MBC
spatial planning policy. Hydrological assessment has shown that the
proposed development is at low risk of flooding from any other non-fluvial
source and that the development will not result in any increase in flood risk
at the site or the surrounding area. It is therefore concluded that the
proposed development of six wind turbines and associated infrastructure
at the Penny Hill site is fully compliant with the objectives of PPS25.
MITIGATION
13.37 Data from the desk study identifying areas which are likely to affect the
location of the wind turbines, was used in designing the layout of the
proposed wind farm. Locating turbines and other site infrastructure
outside these areas was undertaken.
GROUND CONDITIONS
13.38 The proposed location of the six wind turbines on a relative topographical
plateaux away from steep valley sides, significantly reduces the potential
landslip effects of alluvial material/head deposits to a negligible level.
13.39 The British Geological Survey and Coal Authority reports for the area
explain that the potential of shrink swell clays to cause a significant
problem are negligible, as the clays are classified as having „low plasticity‟
and are on a level as to cause a hazard only in exceptional circumstances.
13.40 The geological faults within the site are of ancient origin and are
considered to present no threat no threat to property in terms of natural
tectonic activity. The depth and age of old workings indicate that future
ground movements are very unlikely. No notice of the risk of the land
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Penny Hill Wind Farm
Environmental Statement