Water Cycle Study - East Devon District Council

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Appendix B – Geology characteristics Geology Geological and Hydrogeological Properties1 Aquifer Class (Infiltration Drainage Potential)2 Age Group/ Formation Unit Age Group/ Unit Formation Quaternary (Pleistocene and Recent) Upper Cretaceous Lower Cretaceous Chalk Super group Greensand Group Ref EWCS April 2010 Peat Silt and fibrous plant material. Highly porous but poorly permeable Alluvium Silt and clay, often overlying or containing lenses of sand and gravel. Variably porous and permeable (generally poor, although River Terrace Gravels Plateau Gravels and Clay-with- Flints sands and gravels may be significant locally) Coarse sands and gravels in river valleys. Typically present above current river levels at multiple elevations. Generally moderately to highly porous and permeable Coarse sands and gravels chiefly of flint and/or chert, set in clay in the case of Claywith-Flints. Poorly to moderately porous and permeable Head deposits Heterogeneous mix of clay, silt, sand and gravel of periglacial origin. May be layered depending on local provenance. Poorly to moderately porous and permeable Extremely pure white limestones with random and bedded flint. Generally highly porous (primary and secondary) and permeable Silty, fine-grained, glauconitic and variably shelly sand and sandstone. Moderately permeable, highly porous. Non - Aquifer (Poor) Non - Aquifer (Poor) Minor aquifer (Moderate) Non - Aquifer (Poor) Non - Aquifer (Poor) Major (Good) Major (Good) 11 Distribution within Study Area 3 Restricted to river valleys and generally only of local occurrence Widespread in river valleys, particularly in the Exe and Axe Relatively minor restricted to Exe valley On high plateaux of East Devon between Rivers Otter and Lim At toe of valley slopes in all areas of study area Caps high ground between Rivers Axe and Lim and as outlier at Beer Forms high ground between Rivers Axe and Lim Exeter and East Devon Water Cycle Study Groundwater Flooding Potential4 Unlikely Possible - though likely related to fluvial/tidal events Possible – though likely related to fluvial/tidal events WCS Sites affected D2, E12, EXM, OSM, COLY, D2, D3, E0, E1, E2, E3, E4, E5, E6, E7, E8, E11, E12, ECS, EXM, BUD, NEWT, OSM, AXM, Unlikely COLY, BEER Unlikely D3, E1, E2, E3, E4, E5, E6, E7, E8, E9, E11, E12, NEWT, OSM, SID, HON Unlikely AXM, BEER Possible but localised SEAT, COLY
Exeter and East Devon Water Cycle Study Appendix B – Geology characteristics Geology Geological and Hydrogeological Properties1 Aquifer Class (Infiltration Drainage Potential)2 Age Group/ Unit Formation Gault Formation Clays and sandy clays. Low porosity and impermeable. Unconformity Jurassic Lias Group Blue Lias Formation Triassic Penarth Group Triassic/ Permian Mercia Mudstone Group Sherwood Sandstone Group Aylesbeare Mudstone Group Otter Sandstone Formation Budleigh Salterton Pebble Beds Littleham Mudstone Formation Thin, jointed limestone interbedded with mudstones. Generally poorly permeable but fractures (secondary porosity) allows minor yields in some areas Mudstones and siltstones with limestones near top. Low porosity, poorly permeable Mudstones with thin siltstones and rare sandstones. Low porosity, poorly permeable Fine silty sandstones with local bands of mudstone, siltstone and gravel. Highly porous, moderately to highly permeable Coarse sandy silty gravels with cobbles and lenses of sandstone, mudstone and siltstone. Highly porous, moderately to highly permeable Mudstones and siltstones with rare channelised sandstones and gravels. Low porosity, generally poorly permeable Non - Aquifer (Poor) Minor aquifer (Moderate) Non Aquifer (Poor) Non Aquifer (Poor) Minor aquifer (Moderate) Major aquifer (Good) Non Aquifer (Poor) 11 Ref EWCS April 2010 Distribution within Study Area 3 Restricted outcrop below Greensand in valley sides Between Charton Bay and eastern boundary of study area and in upper reaches of Axe catchment Between River Axe and eastern boundary of study area. Restricted surface outcrop (capped by Chalk) Between Rivers Sid and Axe through to northwest limit of study area Between Rivers Otter and Sid through to north of study area Budleigh Salterton northward towards Wellington Littleham to Budleigh Salterton through to north of study area Groundwater Flooding Potential4 Unlikely Possible but localised WCS Sites affected AXM Unlikely AXM Possible but localised OSM, SID, HON, SEAT, COLY, AXM Unlikely BUD, NEWT, OSM, SID Unlikely Possible but localised D4, EXM
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Water Cycle Study - East Devon District Council

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