Sadler, who lives aboard his boat on the canal, said on the days he visited the feeder stream from Killington, he noticed reduced water flows coming into the canal in comparison to previous years.
He said: "My boat is 2ft 2in in terms of the depth of water it requires, so anything less than that and I'm grounded, so very small changes in water levels actually make a huge difference as to whether it's a pleasurable boating experience or whether you're struggling."
He said that the hot and dry summer would have lowered the water level in the canal, "but not to the point where we are now".
Amanda Taylor-Beswick bought a boat in the last month, but has been so far unable to use it "because the water levels are too low".
She believes leaks and maintenance issues are key factors in the water level issues.
"You could have low water and the canal well maintained, dredged, and cleaned, and therefore you're not going to come into problems," she said.
"It's a very difficult circumstance to be in, given the cost of the boat, the moorings, the licence fees.... the best we can do is sit on the boat really."
Mark Jones, who runs Kingfisher Cruises on the canal, said he has had to cancel a number of bookings.
"We operate from Barton Grange and from Lancaster and the problem is now we can't get to Lancaster from Barton Grange because the water's too low," he said.
"Three weeks ago, we had to leave Lancaster early, we had a week's worth of bookings still to go up there, but we had to leave."
He said cancellations have so far cost the business £1,500 and by the end of the summer he could have lost £5,000 worth of bookings.
"It costs us about £15,000 to operate in the first place before we make a penny with insurance, licences, marina fees," he said.
He said the Trust has "solved a few problems and the water's stabilised," but "that should have been done in May, June time" adding that "it's too late now".
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