Research and analysis
B1b: Riverine inputs of selected nutrients into English tidal waters, 2008 to 2019
Updated 1 December 2025
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| year | nutrient | value |
|---|---|---|
| 2008 | Ortho-Phosphate | 100.0 |
| 2009 | Ortho-Phosphate | 65.17858313 |
| 2010 | Ortho-Phosphate | 59.07348095 |
| 2011 | Ortho-Phosphate | 60.85089678 |
| 2012 | Ortho-Phosphate | 81.06270708 |
| 2013 | Ortho-Phosphate | 59.57996353 |
| 2014 | Ortho-Phosphate | 63.63961788 |
| 2015 | Ortho-Phosphate | 53.05723564 |
| 2016 | Ortho-Phosphate | 53.66842816 |
| 2017 | Ortho-Phosphate | 48.80971958 |
| 2018 | Ortho-Phosphate | 48.9910605 |
| 2019 | Ortho-Phosphate | 51.43245221 |
| 2008 | Total Nitrogen | 100.0 |
| 2009 | Total Nitrogen | 69.69735487 |
| 2010 | Total Nitrogen | 57.258818 |
| 2011 | Total Nitrogen | 52.1461432 |
| 2012 | Total Nitrogen | 79.79558985 |
| 2013 | Total Nitrogen | 70.32894255 |
| 2014 | Total Nitrogen | 82.379647 |
| 2015 | Total Nitrogen | 63.63233418 |
| 2016 | Total Nitrogen | 76.98931947 |
| 2017 | Total Nitrogen | 60.12205384 |
| 2018 | Total Nitrogen | 80.65997078 |
| 2019 | Total Nitrogen | 59.29818048 |
| 2008 | flow | 100.0 |
| 2009 | flow | 78.31492129 |
| 2010 | flow | 65.42533127 |
| 2011 | flow | 62.7103821 |
| 2012 | flow | 108.1184197 |
| 2013 | flow | 81.36298833 |
| 2014 | flow | 99.45438158 |
| 2015 | flow | 82.66669288 |
| 2016 | flow | 79.18649536 |
| 2017 | flow | 65.64258774 |
| 2018 | flow | 73.22303524 |
| 2019 | flow | 90.11383853 |