River levels at Matlock can be found here.
Reservoir levels can be found here.
It takes about 4-5 hours for water to get from Ladybower to Chatsworth and 6-7 hours to get to Matlock.
A rough guide to river levels at Matlock:
1.23m – flowing over Killer- good eddies- nice level for experienced paddlers to play
1.29m – no egress at bottom steps
1.65m – very few eddies; washed out- too high to do anything
3.99m – touches bridge!