Water Resources in East Anglia
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Balancing Hydro-ecological Needs with Sustainable Groundwater Abstraction Anglian Region's Framew ork for Managing Groundwater Resources Hydrogeology Meets Hydroecology Geological Society, 22nd May 2008 Andy Brooks (Entec UK Ltd) Mark Grout (Environment Agency) Objectives Provide a quick overview of 9 years of work in 15 minutes! – Development of a framework for managing groundwater resources making use of new distributed groundwater flow models – RSA and Habitats Directive Review of Consents 1 Water Resources in East Anglia East Anglia – As a region is highly dependent upon groundwater as a potable source. Ca 45% of w ater comes from groundwate r Main aquifers comprise Lincolnshire Limestone, Greensand, Crag and Chalk. Main aquifers underly 55% of the Anglian Region Thousands of agricultural users (spray irrigation etc) and industrial users The 90s was a dry decade - 2 serious droughts. Perception abstraction damaging wetlands. Groundwater Strategy The strategy established: – A programme to ensure a good understandi ng of the main groundwater systems across the region – The approach to be taken to groundwater investigation and modelli ng – The 'whole-life' approach to investigations and modelling, which means keeping models up to date and validated – A plan for maximising the use of groundwater models to directly support abstraction licensing – A plan for developing a distributed groundwater model framework which could provide a common management framework between the Agency and water companies 2 Upper Humber Barton and Barrow Clay Pit s ! ! Pyewipe and Cleethorpes Coast Model Areas ! Laceby Beck ! North Lin colnshir e Coast 32 ! Wait he Beck ! Northern Limestone ! Saltfleetby and Theddlethorpe Dunes LCSS! 34 33 Moor Farm Central Limestone ! ! !KirkbyFu Molsorby Wo od ! Gibraltar Point !Tattersha llCa rs Troy Wo od ! River Brant Tat!tersha!ll Old Gr avel Pit s Lincs Chalk ! River Slea ! LCSS and Spilsby River Glaven ! 3 4 River Stiffkey ! Upper RivLLS er Witham 35 ! Sandstone Syderstone Commo n 4 The Wash Bryants Heath, Felmingham ! 4 NW N Westwick Lakes 1 7 YNNWhitwell Common Leziate, Sugar & Derby Fens Alderford Common Baston Fen Beetley & Hoe Meadow5sSwannington Upgate Common Lincs ! East Winch Common 2River Nar Dillington Carr, Gressenhall Castle Acre Commo n De reham Rush Meadow Southern Lim e stone 5 4 LLS ! Sweet Briar Road Meadows Norwich Rutla nd Water 7 Limestone ! 7 6 Caudle Commo n ! Caudle Springs Boughton FenStringside Beck 8 ! Scoulton Me re Nene Wa shes ! Hooks Well Meadows, Great Cressingham Estate Pond ! ! 6 Didlington Park Lakes Cranberry Rough, Hockham Forncett Meadows (nr Long Stratt North W est Wretham Park Meres Old Buckenham Fen 10 !New Buckenham Moat East Harling Common NW N Kenninghall & Banham Fens with Quidenham Mere Wo odwalton Fen Middle Harling Fen ! EO9 Norfolk PashfordLaPo kenorhesat Fenh , PooLakrsenh Feeanth 15 River Little Ouse - Rushford ! Hopton Fen Bugg's Hole, Thelnetham 11 16 Soham Wet Horse Fen Br ampton Racecourse West Stow Heath Breckland! Farmland Brackland Rough Yare and North 12 13 Sizewell Marshes YNN 27 WES 17 Leiston -Aldeburgh Wilbraham FensLittle Wilbraham River Felme rsham Gravel Pits ! 14 Fulbourn Fen River Lark and Catchment Norfolk Stevington Marsh Hobson's Brook (Nine We ls) ! ! 18 Dernford Fen 19 Sawston Hall MeadowsAlder Carr L-moor, SheprethThriplow Peat Holes WhFow itlesflmerorde-Th Waripterlowcr essHumm Bedsocky Fields River Gipping CBO29 20 ! EO El y Ouse 28 As hwel Springs Cornard Mere River Brett Trimley Marshes Flitwick Mo or 30 ! ! Wavendon Heath Ponds Pulloxhil Marsh Upper Pant ! Ardleigh Reservoir & Colne River Nares Gladley Marsh 31 River HizRiver Granta and Catchment ! W aveney and Fancott Wo ods & Meadows ! 21 22 UpUpppeerr RivColerne CoMalnershes WES Houghton Regis Marl Lakes ESSEX! East Suffolk 23 25 24 Cam Bedford CBO Ouse 26 Model Layering – Complexity in Anglian Region Anglian models typically have 5 – 10 layers Models of the Chalk in Southern England typically have 1 or 2. So why have so many layers? 3 Geological Succession Quaternary & Recent sands and gravels,.. ..tills and clays Crag London Clay etc. Chalk Does the drift matter? main gauging stations spot gauging locations (amount of data varies) W h er e i s th e ch al k? Flows from ‘drift’ covered areas are often more than 50% of flow at main gauging stations. Supports wetlands – Majority of wetlands are within the 'drift' Provides reservoir for Chalk 'recharge' 4 Groundwater model output 590000 595000 600000 605000 610000 615000 620000 625000 630000 Ke y: Ab stractions: 3 45000 3 45000 PWS ab st r act i ons 0. 2 0.8 Groundwater abstractions 4 0 . 4 Surfacewater a bst r act i on s 4 N 0 . 4 0.6 0 . 0 5 .6 0. 4 3 4 0 5 Protected Water Feature : 0 . 8 5 . 4 2 2 3 2 6 . 3 4 0 0. 1 1 1 RoC Site . 8 1 5 5 0 2 0 . 4 0 5 3 1 .2 4 RSA non RoC Site 0. 4 340000 1 0 340000 4 .1 5 3 3 5 0.8 2 3 3 3 4 5 2 RoC Site 0 . 4 . 8 0 4 3 2 RSA non RoC Site 3 4 . 6 2 0 4 3 4 5 4 Regional Catchment Setting 5 2 2 3 Wen sum a nd B ur e 2 3 4 2 4 3 3 2 Hydrometric Catchment 5 3 4 1 5 5 Rivers . 8 3 0 2 335000 4 4 2 335000 4R Routing Network 4 4 0. 4 2 5 . 6 4 0 5 4 1 3 MODFLOW stre am cells 0 2 .4 5 5 5 0 . 1 4 4 0 N a t ur al i se d ch al k G WL mi nu s 2 . 1 3 8 0 . 0. 4 1 1 Full Li ce nc e C ha lk GW L, 1 2 3 5 Dry (August 1991) 0 1 3 0.6 .4 .4 1 5 0 6 (Run: YNNv9_3TR) . 8 4 0 . 0 3 2 1 0 . 2 2 1 1 1 . 6 0.8 0 0 5 -0.9 - 0.1 330000 . 2 330000 . 2 0 0 2 . 1 1 4 0. 1 - 0.2 0. 3 4 1 2 0. 2 - 0.4 . 0 1 3 3 2 5 5 2 2 0. 4 - 0.6 3 5 3 3 2 0 1 2 0. 6 - 0.8 .2 5 2 0 1 2 0. .2 1 4 2 3 4 . 5 0. 0. 8 - 1.0 000 1 0 2 000 2 4 325 4 0 325 . 2 . 1. 0 - 2.0 0 0 1 2 0 1 .1 0. 8 .6 0 8 2 .4 . 0 2. 0 - 3.0 0 .1 5 . 2 0 2 Buxton Heat h SSS I 0 .8 2 2 3. 0 - 4.0 .6 0. 0 6 3 1 . 8 1 0 2 0 .2 4. 0 - 5.0 . 1 2 1 0 1 1 .2 1 5. 0 - 51.7 2 4 0 0 . 1 6 .2 .8 8 320000 0 0 0 2 0 . 8 320000 . 0 0 . 2 0. 6 0.2 6 5 . 0 . .8 6 2 0. 8 8 0 4 1 1 1 3 0. 2 1 6 0 . 3 0.6 1 2 0. 0. 1 0 6 .8 0 3 2 . 0. 2 4 3 0 .2 0.4 0. 8 2 3 2 2 1 5 0. 6 2 3 2 5 4 3 0 0 1 . .8 01,000 2, 0003,000 4,000 5 3 6 4 Me tres 315000 4 0 0. 8 315000 5 0 .1 1 3 . 1: 150000 @ A3 0.4 2 2 Proj ect Pat h: G:/MODEL/P ROJECTS/ HM-250/18417/ArcGIS/ .4 3 1 1 0 1 0. 1 Buxt onHeath/ 18417- S291 Fi g 6. 3 Bux tonNat minusFLG WLs.mxd 0.2 8 1 0 .8 0 0. 2 2 . 8 3 4 0 E nv ir o nm en t Agency Anglian Region 0.2 0 2 0.2 0.1 1 . 8 2 Habi tats Directive Review of Consents 0 5 8 . 1 1 Stage 4: Site Options Plan 2 . 4 0.8 0 3 3 . 8 Buxton Heath SSSI 1 0 0000 5 1 1 0 0000 31 . 31 Figure 6.3 2 3 0 .2 Modelled Full Licence Impacts 0 1 4 1 .8 . 8 5 0.1 .8 0 0 2 Natura lised Chalk G WL Minus 4 0.2 3 0.1 1 8 1 0. 1 4 . Full Li c en ce C h al k GW L , Dr y 1 0 0. 8 1 2 (August 1991) 2 0 .8 0. 4 0.2 . 0 4 2 3 Oct ober 2007 18417- S291 wi ll s 590000 595000 600000 605000 610000 615000 620000 625000 630000 This m ap is repr oduced fr o m OS ma te r ia l wi th t he per missi on of OS on behalf of the Controller of HMSO © Crow n copyright . Unauthor ised r eproducti on in f ri nges Crown copyri ght and may lead to pr osecut ion or ci vil pr oceedings. EA, 100026380, 2007 Uses of Models in Anglian Region Impact assessments at wetlands, potentially leading to reductions in abstraction – HD RoC – RSA on Non-Roc – Water company plans – AMP studies – Licence determinations Estimation of drought impacts CAMS WFD Significant Damage 5 Restoring Sustainable Abstraction RSA Programme set up by the Environment Agency in 1999 to identify and catalogue those sites which may be at risk from abstraction Main legal and policy requirements for EA – Must ensure that licensed water abstractions (along with all other Environment Agency issued permissions) do not adversely affect the integrity of sites of European importance (SACs and SPAs) – Take action for SSSI at risk – PSA Agreement 95% in favourable condition by 2010 – Agency has to protect BAP habi tats and species – Take action on local issues Implications for Anglian Region Nor th Norfolk Coast N orth Norfolk Coast River Glaven Sheringham & Beeston Regis Commons ! Overstrand Cliffs 3 4 Holt Lowes River Stiffkey ! Southrepps Common Syderstone Common 4 B ryants Heath, Felmingham Riv e r Wensum 4 Westw ick Lakes C althorpe Broad Broad Fen, Dilham Priory Meadows, Hickling 1 Smallburgh Fen Booton Common 7 W i nt e r t o n- H o r s ey D u ne s Buxton Heath Whitwell Common Ant Broads & Mars hes Upper Thurne Broads & Marshes River Wensum Alderfen Broad 5 Alderford Common Beetley & Hoe Meadow s Swannington Upgate Common Ludham-Potter Heigham Marshes River Nar Bure Broads & Mars hes S h a ll a m D y ke Ma r s he s, T h ur ne Dillington Carr, Gressenhall Cro stwi ck Marsh 2 Bure Broads & Marshes Castle Acre Common De re ham Rus h Meadow 5 4 Upton Broad & MarshesTrinity Broads Burgh Common & Muckfleet Marshes Badley Moor, D ereham Sweet B riar Road Meadows Norwich Damgate Marshes, Ac le 7De coy C arr, Ac le 7 Breydon Water Coston Fen, R unhall Yare Broads & Marshes Yare Broads & Mars hes 6 H alvergate Marshes Caudle Common Cantley Marshes ! C audle Springs Du can 's Mars h, Cl axto nLimpenhoe Meadows 8 Great Cressingham Fen Poplar Farm Meadows, Langley Boughton Fen ! Scoulton Mere ! Foulden Common Estate Pond ! 6 Ha rd ley Fl o od Flordon Common Didlington Park Lakes Thom pson Water, Carr & Common Stanford Training Area Cra nberry Rough, HockhamSwangey Fen, Attleborough Forncett Meadows (nr Long Stratt Stanley & Alder Carrs, Aldeby Wre tha m Pa rk Mere s Geldeston Meadows New Buckenham Moat 10 ! Barnby Broad & Marshes Eas tWretham Heath East Harling Common Ke nninghall