| Middle Cumberland River Watershed | Stones River Watershed | Harpeth River Watershed |
2015 | 64.3 | 56.5 | 39.0 |
2016 | 50.0 | 77.8 | 50.2 |
2017 | 53.0 | 77.0 | 50.0 |
2018 | 50.4 | 56.5 | 58.3 |