The 19-year-old defender was released by the Hornets at the end of last season but will now link up with the development squad at Ewood Park.
Tumwa has been training with Gary Bowyer's men all summer and has managed to earn himself a one-year contract.
He was loaned out to non-league Wealdstone last year.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | West Bromwich AlbionWest Brom | 6 | 5 | 1 | 0 | 10 | 2 | 8 | 16 |
| 2 | Sunderland | 6 | 5 | 0 | 1 | 13 | 4 | 9 | 15 |
| 3 | Burnley | 6 | 4 | 1 | 1 | 13 | 4 | 9 | 13 |
| 4 | Blackburn RoversBlackburn | 6 | 3 | 3 | 0 | 12 | 6 | 6 | 12 |
| 5 | Sheffield UnitedSheff Utd | 6 | 4 | 2 | 0 | 9 | 3 | 6 | 12 |
| 6 | Leeds UnitedLeeds | 6 | 3 | 2 | 1 | 9 | 4 | 5 | 11 |
| 7 | Swansea CitySwansea | 6 | 3 | 1 | 2 | 7 | 4 | 3 | 10 |
| 8 | Watford | 6 | 3 | 1 | 2 | 10 | 9 | 1 | 10 |
| 9 | Oxford UnitedOxford Utd | 6 | 3 | 0 | 3 | 10 | 8 | 2 | 9 |
| 10 | Derby CountyDerby | 6 | 3 | 0 | 3 | 8 | 7 | 1 | 9 |
| 11 | Norwich CityNorwich | 6 | 2 | 2 | 2 | 8 | 7 | 1 | 8 |
| 12 | Middlesbrough | 6 | 2 | 2 | 2 | 6 | 5 | 1 | 8 |
| 13 | Plymouth ArgylePlymouth | 7 | 2 | 2 | 3 | 8 | 11 | -3 | 8 |
| 14 | Bristol City | 6 | 2 | 2 | 2 | 8 | 12 | -4 | 8 |
| 15 | Queens Park RangersQPR | 6 | 1 | 4 | 1 | 8 | 9 | -1 | 7 |
| 16 | Luton TownLuton | 7 | 2 | 1 | 4 | 6 | 11 | -5 | 7 |
| 17 | Hull City | 6 | 1 | 3 | 2 | 5 | 7 | -2 | 6 |
| 18 | Stoke CityStoke | 6 | 2 | 0 | 4 | 4 | 9 | -5 | 6 |
| 19 | Millwall | 6 | 1 | 2 | 3 | 9 | 9 | 0 | 5 |
| 20 | Coventry CityCoventry | 6 | 1 | 2 | 3 | 6 | 8 | -2 | 5 |
| 21 | Preston North EndPreston | 6 | 1 | 2 | 3 | 3 | 9 | -6 | 5 |
| 22 | Sheffield WednesdaySheff Weds | 6 | 1 | 1 | 4 | 6 | 12 | -6 | 4 |
| 23 | Portsmouth | 6 | 0 | 3 | 3 | 7 | 13 | -6 | 3 |
| 24 | Cardiff CityCardiff | 6 | 0 | 1 | 5 | 1 | 13 | -12 | 1 |
| > Championship Full Table | |||||||||
