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Title: River quality survey NRA Northumbria and Yorkshire region GQA assessment 1994. Part 2 sample point report
Author: National Rivers Authority Northumbria and Yorkshire Region
Document Type: Monograph
To allow the development of a National method of evaluating water quality, the rivers in all the NRA regions of England and Wales have been divided into reaches, which are numbered using a coding system based on the hydrological reference for each river basin. Each classified reach then has a chemistry sample point assigned to it and these sample points are regularly monitored for Biochemical Oxygen Demand (BOD), Dissolved oxygen (DO) and Total Ammonia. The summary statistics calculated from the results of this sampling are sent to a National Centre where the GQA Grades are calculated. A National report is produced and each region can then produce more detailed reports on the quality of their own rivers. For Northumbria and Yorkshire Region, this Regional Report has been divided into two parts. This report is the part 2. This report contains more detailed information on the summary statistics for each GQA sample point. The sample points listed in numeric order and the summary statistics for the 1990 and 1994 classification are provided for comparison. Sample points classifying reaches where there has been no change over the years 1992 to 1994 are listed in the main part of the report. Appendix A lists the summary statistics for reaches where there has been a change of sample point over the last three years. The statistics in this case are on a reach basis and the sample point listed is the one used in 1994.
Publisher: National Rivers Authority
Publication Date: 1995
Publication Place: [Leeds]
Subject Keywords: Water samplingWater quality surveysPollutant loadRiversStatistics
Geographic Keywords: EA Yorkshire and North East
Extent: n.p. [392]
Total file downloads: 281

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