Hydrometric Data Management a National Perspective. Matt Fry, National River Flow Archive. CEH Wallingford

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1 Hydrometric Data Management a National Perspective Matt Fry National River Flow Archive CEH Wallingford

2 National River Flow Archive - Objectives UK focal point for hydrometric data Long term data management and stewardship of river flow data Add value through quality control, quality assurance and metadata Provide data directly to scientific and public users, and to organisations Assessment and attribution of trends (CEH science programme objective) Regular and responsive commentary on hydrological and water resources conditions Strategic overview of national monitoring capabilities

3 Information flow Data Network Design & Evolution Monitoring Processing & Quality Control Analysis & Synthesis/Metadata Dissemination Information Application

4 UK Gauging Station Network >1500 Gauging Stations Not all qualify as primary stations Dense network in international terms Necessary response to the diversity of the UK Need for reference, spatial and performance information Multi-functional but strong operational bias UK Hydrometric Network

5 Range of Strategic Needs Service Level Agreement (SLA) highest strategic utility; additional validation. Data/network dimensions. Phased Web release of time series. National Hydrological Monitoring Programme Benchmark Impact High/Low flow networks (e.g. for use in regionalisation procedures) Other national (Harmonised Monitoring/Water Framework Directive et al) Research (Plynlimon, LOCAR) International (FRIEND, GRDC, GCOS et al)

6 National Hydrological Monitoring Programme Impartial, authoritative documentation and interpretation of UK hydrological conditions Joint CEH/BGS programme (capitalising on the NRFA & NGLA) Close collaboration with EA, SEPA, RA and Met Office Documentation of major hydrological events Identify and interpret hydrological trends Providing advice and guidance to Gov., NGOs, International Organisations Media briefings and public outreach Water Watch Web site:

7 May 2008

8 Occasional reports 2007 floods Collaborative programme Immediate response in June and July Hydrological Summaries Close liaison with EA throughout Contribute to flood gauging/visiting flood affected areas Reports on risk of groundwater flooding in winter of 2007/08 Hydrological appraisal released March 2008 Extensive media briefings! Input to into Pitt Review, EFRA Enquiry and other Select committees

9 Range of Strategic Needs Service Level Agreement (SLA) highest strategic utility; additional validation. Data/network dimensions. Phased Web release of time series. Benchmark Impact National Hydrological Monitoring Programme High/Low flow networks (e.g. for use in regionalisation procedures) Other national (Harmonised Monitoring/Water Framework Directive et al) Research (Plynlimon, LOCAR) International (FRIEND, GRDC, GCOS et al)

10 Capturing change CET E&W annual, Jun-Aug relative precipitation to Hydrometric data assume a particular importance at a time of actual, or anticipated, hydrological change UKCIP09

11 Benchmark Network Around 80 catchments designated Focus for trend detection significant ongoing research Long records Limited impact of artificial influences Excellent hydrometric performance Homogeneous time series International dimension e.g. Reviewing IPCC IVth Assessment FRIEND (UNESCO): pan-european drought assessments Significant high flow trends in western areas of the UK

12 Importance of extremes Many users are primarily interested in the extreme flow ranges Capturing good quality data 99% of the time might not be enough

13 Capturing hydrometric performance Ouse at Gold Bridge, Southern Region

14 Data stewardship NRFA regional representative system Annual validation of Measuring Authority data holdings, and resolution of issues Reconciliation programme Balance between accuracy and utility of records (Appropriate) infilling of gaps Auditing of data quality and changes to records Good quality metadata is important Good tools are invaluable A lot of time is required

15 Data reconciliation programme Aim: Increase the integrity and accessibility of NRFA and MA data Harmonise existing NRFA and MA data holdings Resolve discrepancies due to reprocessing, QC editing, data completeness issues Increase data availability via the web Allow full period-of-record time series release on the NRFA website Qualifying time series for web release must have been subject to vigorous QC Reduce future inconsistencies and increase data consultation Clear the backlog of discrepancies Ongoing process, two-way process

16 Instrumentation issues

17 Simple errors

18 More subtle issues

19 Low Flow validation Hydrometric Register included catalogue of POR 7-day minimum flows Manual validation of flows essential Liaison with Measuring Authorities

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22 Infilling Compare catchments Response to events How does infilling add value to the record? Recession Fit to peaks

23 Infilling?

24 Data dissemination Letting hydrometric data speak for themselves?

25 Additional data holdings Time Series datasets Met Office daily rainfall archive National Groundwater Level Archive Spatial datasets SAAR DTM and derived data (aspects, drainage paths) Soils (BFIHOST) Land cover, including urban extent Hydrogeology

26 Gauging station quality information Contextual quality records inform the utility of flow series Gauging station structure and instrumentation Quality of record Significant events Catchment descriptions Catchment statistics

27 Descriptive commentaries

28 Hydrometric Register Collaborative publication Reference source for UK hydrometric data Fosters more effective use of river flow and groundwater level data Wide range of flow statistics, reference details and catchment information (geology, land use, climate)

29 NRFA Website Gauging station searchable through metadata Zoomable map-based interface Dynamic graphing and data access for reconciled stations New trends pages Comprehensive background information, e.g. derivation of statistics

30 Thank you