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Assessing the water resource sustainability of Trinity Broads, Norfolk : initial appraisal of the water flux, storage and groundwater data for use in the conceptual daily water balance model

Hudson, J.A.; Hewitt, E.J.; Robins, N.S.. 2003 Assessing the water resource sustainability of Trinity Broads, Norfolk : initial appraisal of the water flux, storage and groundwater data for use in the conceptual daily water balance model. Nottingham, UK, British Geological Survey, 31pp. (CR/03/068N) (Unpublished)

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Abstract/Summary

Data are required to inform and calibrate a conceptual water balance of the Trinity Broad system including the internal fluxes feeding the water supply taken from Ormesby Broad. The water balance will enable Essex and Suffolk Water Company to use the resource in full knowledge of the environmental impacts. Since the inception study during the winter of 2001/02 Starflow® gauges have been installed beneath the main causeways and in the Muck Fleet channel to observe inter-broad flow and overall outflow from the system. In addition, five observation boreholes have been drilled and water level and groundwater chemistry data collected. Meteorological data continues to be gathered for the area. The flow data have been problematical, as periodic erratic records, or apparent peak flows equating with torrents flowing beneath the causeways, have had to be identified and filtered out of the data set. The cause of these erratic data are not known, but running mean filtering and picking minimum flows from the means has enabled some consistency to be gained, and a ‘worst case’ scenario for environmental compensation flows identified. An outline water balance for the system suggests that the Trinity Broads can sustain current abstraction with some margin. Confirmation of this is the constant measured outflow in the Muck Fleet channel, other than immediately after the sluices have been opened. It is recommended that flow data collection continues for at least two and preferably three years, and to include one dry summer if possible. Modelling of the system should be enhanced by parameterisation of a groundwater model to allow checks of various future climate, management and operational scenarios to be carried out. Development of an hourly model to supplement the daily information would also be useful in assessing within-day stresses on the resource.

Item Type: Publication - Report
Programmes: BGS Programmes > Groundwater Management
Funders/Sponsors: British Geological Survey
Additional Information. Not used in RCUK Gateway to Research.: This item has been internally reviewed, but not externally peer-reviewed.
Additional Keywords: GroundwaterBGS, Groundwater, Catchment processes, Groundwater manasgement
Date made live: 24 Mar 2020 14:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/527308

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