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/ Unit Formation Ref EWCS April 2010 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) 10 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 Exeter and East Devon Water Cycle Study 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
Exeter and East Devon Water Cycle Study Appendix B – Geology characteristics Geology Geological and Hydrogeological Properties1 Aquifer Class (Infiltration Drainage Age Group/ Formation Permian Carbonifer ous Exeter Group Holsworthy Group Unit Exmouth Mudstone and Sandstone Formation Alphington and Whipton Formations etc. Dawlish Sandstone Formation Crackington Formation Mudstones and siltstones with channelised and massive sandstones. Variably porous, poorly to moderately permeable Sandy breccias with lenses of mudstone. Variably porous, moderately permeable Fine sandstones with infrequent bands of impermeable mudstone. Highly porous, moderately to highly permeable Mudstones, siltstones and sandstones. Variably porous, poorly to moderately permeable. Minor yields from fractures Potential)2 Minor aquifer (Moderate) Minor aquifer (Moderate) Major aquifer (Good) Non Aquifer (Poor) 10 Ref EWCS April 2010 Distribution within Study Area 3 Exmouth north along east bank of the Exe Estuary to north of study area Exeter City and west-side of River Clyst Eastern-side of Exe Estuary and of River Clyst Groundwater Flooding Potential4 Possible but localised WCS Sites affected , D4, E0, E2, E3, E4, E5, E6, E7, E8, ECS, EXM Unlikely T1, C1, C2, D1 Unlikely C2, C3, C4, , D1, D4, E1, E9, E10, Possible but localised E11, E12, ECS C4, E9, E10, E11 Notes to Table: 1. Generalised descriptions only. Major impermeable units (e.g. Fullers Earth, Lower Lias Shales and mudstones) may have very localised more permeable units but these are unlikely to be significant in extent. Groundwater flooding may occur in small bodies outside main aquifer units 2. Aquifer classification based on Aquifer Properties Manuals (BGS 1997; 2000). The infiltration drainage potential is based primarily on indicative geological/lithological/hydrogeological properties only – soils, groundwater levels, unit thickness and topographic setting will further constrain potential and must be investigated locally. 3. Distribution from 1:50,000 geological mapping. Locations approximate. 4 Groundwater flooding potential – indicative only (possible/unlikely) related to potential for more extensive flooding (unless stated), refer “FRIS” Mapping for occurrence of groundwater flooding to date. Localised flooding may from small groundwater bodies in all formations. Appendix B – Geology characteristics Geology Geological and Hydrogeological Properties1 Aquifer Class (Infiltration Drainage Potential)2 Distribution within Study Area 3 Groundwater Flooding Potential4 WCS Sites affected
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Water Cycle Study - East Devon District Council

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