1995 Annual Hydrometric Report
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ENVIRONMENT AGENCY SOUTH WEST REGION 1995 ANNUAL HYDROMETRIC REPORT Bridgwater H 'l i w English Channel Environment Agency Manley House, Kestrel Way. Sowton Industrial Estate. n v ir o n m e n t Exeter EX2 7LQ E DX Address 121350 Tel 01392 444000 A g en c y Fax 01392 444238 GTN7- 24- X 1000 Foreword The 1995 Hydrometric Report is the first document of its kind to be produced since the formation of the Environment Agency, South West Region, from the National Rivers Authority, Her Majesty Inspectorate of Pollution and Waste Regulation Authorities. The document is the second in a series of reports produced on an annual basis when all available data for the year has been archived. The principal purpose of the report is to increase the awareness of the hydrometry within the South West Region through listing the current hydrometric networks, key hydrometric staff contacts, what data is available and the reporting options available to users. If you have any comments regarding the content or format of this report then please direct these to the Regional Hydrometric Section at Exeter. En v ir o n m e n t Ag e n c y NATIONAL LIBRARY & INFORMATION SERVICE SOUTH WEST REGION Manley House. Kestrel Way. Exeter EX2 7LQ ENVIRONMENT AGENCY Contents Page number 1.1 Introduction ....................................... .................................. •. -................. 1 1.2 Hydrometric staff contacts.................................... ..................................... 1 1.3 South West Region hydrometric network overview ................................... 1 2.1 Hydrological summary : overview 1995 ....................... ............................ 4 2.2 1995 Monthly hydrological sum m ary............................................................ 4 2.3 Notable flows during 1995 ........... ...................................... ......................... 12 ' 3 Surface water gauging stations..................................................................... 18 3.1 Introduction..................................................................................................... 18 3.2 Station listings and summary statistics ........................... v.. ................... 18 4 Groundwater stations..................................................................................... 65 4.1 Introduction............................. ................................................................... 65 4.2 Station listings.................................................................................................65 5 Rainfall stations . ......................................................................................... 83 5.1 , Introduction...................................................................................................... 83 5.2 Station listings and summary statistics ....................................................... 83 6 Standard reporting options from current systems..................................... 96 6.1 Introduction..................................................................................................... 96 6.2 Surface water............................. ................................................................ 96 6.3 G roundw ater............................................................................................. .. 145 6.4 Rainfall ......................................................................................................... 145 7 Other sources of inform ation..................................................................... 145 7.1 Scope.................. ........................................................................................... 145 7.2 Vax information p ag es................................................................................ 145 7.3 Morecs . ; .................................................................................... ............ 148 7.4 Reservoir sto rag es....................................................................................... 148 7.5 Water situation reports.......................................; ....................................... 148 List of Tables 1 Area and regional hydrometric contacts . .................................................2 2 Areal rainfall totals in South West Region for 1995/1995............................5 3 . Comparison of 1995 mean monthly flows with long term averages .... 6/7 4 Surface water gauging stations - currently operating sites........................ 19 5 Surface water gauging stations - further summary statistics ................... 29 5a Gauging station classification listing ....................................... .. 57 5b Special investigation sites .. .......................................................................... 66 6 Groundwater stations - currently operating sites ..................................... 68 7 Rainfall stations - currently operating sites & summary statistics..........85 List of Figures 1 Spatial variation in annual areal rainfall totals . ..........................................3 2 Variation in soil moisture deficits during 1995 ........................................... 8 3 Variation in reservoir storages during 1995 ............ ................................9 4 Map to show location of current surface water gauging stations ............28 , 5 Map to show location o f current groundwater stations............................82 6 . Map to show location of current rainfall stations .................................... 84 7 Devon & Cornwall surface flow annual reports and flow duration curves ................... ■...........................................................................................97 8 Examples of Devon & Cornwall R143 annual summary and R106 monthly summary reports ............................................................. ......... 109 9 Wessex monthly mean summary reports and flow duration curves ... Ill 10 Devon & Cornwall groundwater hydrographs ...................................... 146 1.1 Introduction This report is the second document of its kind to cover all the hydrometric stations in the South West Region. The report reviews the weather conditions and notable hydrological events during 1995. The current site listings of surface water gauging, groundwater and rainfall stations present reference information for each site, together with the Area offices responsible for data collection and processing. Summary statistics for 1995 and updated long term averages have also been compiled for each current station. Hydrometric staff contacts within each area and regional office are listed for information. Only sites where hydrometric staff are responsible for data collection and processing have been included * in this report. The data archiving systems and standard reports for data analysis and presentation are briefly outlined to help staff tailor their information requests. Additional hydrometric reports and sources of information are also included for reference. This report has built upon the information in the 1994 annual report by extending the coverage of information to include data accuracy, groundwater and rainfall site location maps and special investigation sites. One recommendation from the Hydrometric Efficiency Review was the formation of a service level agreement between hydrometric staff and the customers of the data. A service level agreement for the provision o f hydrometric data is now in operation between hydrometric staff and the Client Board. Service Level agreement specifies the sites at which data will be available on the archives with set timescales and also specifies the accuracy of the data from sites. Further information relating to the SLA is available from the Senior Hydrometric Officer, Area Water Resources Managers and members of the Client Board (which comprises Bill Grigg, Alan Weston, Richard Symonds, Heather Barker, Bob Huggins, Robin Callender and Gordon Trapmore). This annual hydrometric report has been compiled by the regional hydrometric section with support from Area hydrometric colleagues, notably with tlie compilation and verification of the hydrometric site inventories. 1.2 Hydrometric Staff Contacts Table 1 lists the Hydrometric staff in the South West Region in alphabetical order by office. The principal points of contact in each office are the Area W ater Resources Managers and the Senior Hydrometric Officer at the Regional office. Assistant Hydrometric Officers and Technical Assistants are listed alphabetically, followed by licensing and consents staff in each Area Water Resources section. 1.3 South West Region Hydrometric Network Overview The South West region covers 20,802 square kilometres and features over 10000 kilometres of main river. The main hydrometric networks consist of 182 flow gauging station; 307 groundwater stations and 552 rainfall stations in the South W est Region. In addition, 27 special investigation sites were also in operation during 1995. Hydrometric staff undertook approximately 3690 gaugings during the 1995/96 financial year. 1 Table : 1. Area and Regional Hydrometric Contacts. Cornwall Area: Sheila Turner Water Resources Manager Karen Barker Hydrometric Officer Ian Barker Assistant Hydrometric Officer Chris Ridge Assistant Hydrometric Officer Gill Skinner Technical Assistant Geoff Taylor Assistant Hydrometric Officer Carol Valvona Licensing Inspector Devon: Ann Riley Water Resources Manager (maternity leave) Paul Mason Water Resources Manager (cover for WRM maternity leave) Roger Quinn . Hydrometric Officer (cover