Camilty Wind Farm - Partnerships for Renewables

Camilty Wind Farm - Partnerships for Renewables Camilty Wind Farm - Partnerships for Renewables

07.02.2014 Views

Camilty Wind Farm Groundwater Flooding 13.3.23 Groundwater flooding results from water rising up from the underlying rocks or from springs. Groundwater flooding is most likely to occur in low-lying areas underlain by permeable bedrock. 13.3.24 Generally, the topography of the site may suggest that groundwater could be drained effectively towards the rivers crossing the site. The flatter parts of the site include deep peat bogs where groundwater is likely to be permanently near the surface. During winter, groundwater may appear at or just above the surface depending on the local topography and the presence of forestry drains. 13.3.25 Localised groundwater flooding may occur within the limited floodplains along the Crosswood Burn. Artificial Drainage System Flooding 13.3.26 Due to the presence of active commercial forestry throughout the majority of the site, there are numerous artificial networks draining water from the site. 13.3.27 Where systems are not maintained (e.g. build up of sediment or blockages are not removed), the effectiveness and capacity of such drainage systems may become compromised and flooding could occur. Surface Water and Groundwater Quality 13.3.28 The Linhouse Water and Camilty Burn are monitored by SEPA under the Water Framework Directive (WFD) for water quality and ecological status. The most recent classifications based on data collected in 2010 are shown in Table 13.10 below. Table 13.10 Surface Water Quality Classifications River Overall status Overall ecological status Key pressures Linhouse Water / Camilty Burn Poor Poor • Livestock farming (diffusion pollution) • Barriers to fish passage • Abstractions for public water supplies 13.3.29 The site is also underlain by two groundwater classification units, which are also assessed and monitored by SEPA under the WFD for water quality and water resource status. The most recent published classification results are from 2008 and are shown in Table 13.11 below. Table 13.11 Groundwater Quality Classifications Groundwater unit Water quality status Water resource status Designations Key pressures Edinburgh and Livingston bedrock and localised sand and gravel aquifers Poor Poor Drinking Water Directive Groundwater • Mining and quarrying (diffuse source pollution) • Livestock farming and manufacturing (abstractions) March 2013 13-13 Copyright Partnerships for Renewables Development Co. Ltd 2013 © Hydrology, Hydrogeology and Ground Conditions

Camilty Wind Farm Soils and Peat 13.3.30 The Soil Survey of Scotland map indicates that the site soils are dominated by peaty gleys of the Rowanhill soil association with the parent materials comprising drift deposits from Carboniferous geologies (sandstone, shale and limestone). The vegetation and landscapes characterised by the Rowanhill association include blanket bog and heather moorlands. 13.3.31 In addition to the Rowanhill association, in the far southeast of the site the Humbie/Biel association extends onto the site from the southeast. This association comprises a mix of peaty gleys, humic gleys, peaty podzols and peat with parent materials consisting of drifts derived from Lower Carboniferous geologies. The landscapes and vegetation characterised by the Humbie/Biel association are dominated by bog, blanket bog and moist heather moorland. Details of the soil types at the site are included in Table 13.12. Table 13.12 Soil Types Map unit Soil association Component soils Parent material Landforms Vegetation 470 Humbie / Biel Peaty gleys, humic gleys, some peaty podzols and peat Drifts derived from Lower Carboniferous and Upper Old Red Sandstone sediments and lavas Undulating lowlands and uplands with gentle and strong slopes Moist Atlantic heather moor; rush pastures and sedge mires; blanket bog 450 Rowanhill Peaty Gleys (very poorly drained) 450 Rowanhill Peaty Gleys (poorly drained) Drifts derived from Carboniferous sandstones, shales and limestones Undulating foothills with gentle and strong slopes Blanket bog; moist Atlantic heather moor 13.3.32 Initial peat assessments and depth surveys were undertaken at the feasibility stage and during the initial design stages. Surveys were undertaken in December 2011, March 2012 and September 2012 by RPS staff and included a survey of peat depth using probing. 13.3.33 A detailed map of peat depth for deposits of peat located within the site is included in Figure TA13.2.5 in Appendix 13.2. The peat within the site is deep towards the centre of the site, north of the Crosswood Burn. In this area the maximum peat depth is approximately 7 m. In other areas of the site the peat depth is generally much shallower or absent with depths varying between 0 and 3 m approximately. Areas with no peat or peat shallower than 1 m account for almost 60 % of the site area. The distribution of peat depths within the surveyed areas is shown in Table 13.13 below. March 2013 13-14 Copyright Partnerships for Renewables Development Co. Ltd 2013 © Hydrology, Hydrogeology and Ground Conditions

<strong>Camilty</strong> <strong>Wind</strong> <strong>Farm</strong><br />

Groundwater Flooding<br />

13.3.23 Groundwater flooding results from water rising up from the underlying rocks or from springs.<br />

Groundwater flooding is most likely to occur in low-lying areas underlain by permeable<br />

bedrock.<br />

13.3.24 Generally, the topography of the site may suggest that groundwater could be drained<br />

effectively towards the rivers crossing the site. The flatter parts of the site include deep peat<br />

bogs where groundwater is likely to be permanently near the surface. During winter,<br />

groundwater may appear at or just above the surface depending on the local topography and<br />

the presence of <strong>for</strong>estry drains.<br />

13.3.25 Localised groundwater flooding may occur within the limited floodplains along the Crosswood<br />

Burn.<br />

Artificial Drainage System Flooding<br />

13.3.26 Due to the presence of active commercial <strong>for</strong>estry throughout the majority of the site, there<br />

are numerous artificial networks draining water from the site.<br />

13.3.27 Where systems are not maintained (e.g. build up of sediment or blockages are not removed),<br />

the effectiveness and capacity of such drainage systems may become compromised and<br />

flooding could occur.<br />

Surface Water and Groundwater Quality<br />

13.3.28 The Linhouse Water and <strong>Camilty</strong> Burn are monitored by SEPA under the Water Framework<br />

Directive (WFD) <strong>for</strong> water quality and ecological status. The most recent classifications based<br />

on data collected in 2010 are shown in Table 13.10 below.<br />

Table 13.10 Surface Water Quality Classifications<br />

River<br />

Overall<br />

status<br />

Overall<br />

ecological<br />

status<br />

Key pressures<br />

Linhouse Water /<br />

<strong>Camilty</strong> Burn<br />

Poor Poor • Livestock farming (diffusion pollution)<br />

• Barriers to fish passage<br />

• Abstractions <strong>for</strong> public water supplies<br />

13.3.29 The site is also underlain by two groundwater classification units, which are also assessed<br />

and monitored by SEPA under the WFD <strong>for</strong> water quality and water resource status. The<br />

most recent published classification results are from 2008 and are shown in Table 13.11<br />

below.<br />

Table 13.11 Groundwater Quality Classifications<br />

Groundwater unit<br />

Water<br />

quality<br />

status<br />

Water<br />

resource<br />

status<br />

Designations<br />

Key pressures<br />

Edinburgh and<br />

Livingston bedrock<br />

and localised sand<br />

and gravel aquifers<br />

Poor Poor Drinking Water<br />

Directive<br />

Groundwater<br />

• Mining and quarrying (diffuse<br />

source pollution)<br />

• Livestock farming and<br />

manufacturing (abstractions)<br />

March 2013<br />

13-13<br />

Copyright <strong>Partnerships</strong> <strong>for</strong> <strong>Renewables</strong> Development Co. Ltd 2013 ©<br />

Hydrology, Hydrogeology and Ground Conditions

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!