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Title: Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134)
Author: R. Jones
Author: R. Crabtree
Author: K Murrell
Author: k. Simpson
Document Type: Monograph
The overall study objective was to use SIMCAT to model the contribution from nonagricultural sources to nitrate pollution in the proposed Sor Brook NVZ. Under the Nitrates Directive (91/676/EC), Nitrate Vulnerable Zones (NVZs) were designated in April 1996 for protection from pollution by nitrates from agriculture. Surface water zones were designated on the basis of exceedances of 50 mg/ 1 nitrate (as NO3 , equivalent to II.3 mg/1 nitrate nitrogen, NO3-N) in more than 5% of samples at the abstraction point in 1992. The catchment extent was defined on the basis of exceedances at upstream sampling points over the preceding five year period, 1988 - 1992. In Thames Region of the Environment Agency, the Sor Brook was not designated as a NVZ in the 1992 round. However, river water quality data for the period, 1992 - 1996 demonstrates that the Sor Brook Catchment upstream of the Bodicote intake fails. A major criticism of the methodology used in the 1992 NVZ round for the definition of zones was that the contribution of non-agricultural sources of nitrate (for example, inputs from sewage treatment works (STWs) and atmospheric deposition) was not adequately assessed.
Publisher: Environment Agency
Publication Date: 1998
Publication Place: Reading
Subject Keywords: ModellingNitratesWater pollutionFlow rateBrooksRivers
Geographic Keywords: Sor Brook (Oxfordshire)OxfordshireCherwell catchment
Extent: 36
Total file downloads: 334

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