I'm not suprised the Macc has low resevoirs. I explored,and photographed, the feeders to the Bosley and Sutton resevoirs with members of the newly formed Macc canal society between 1984 and 1990. Most of the extensive feeder network had fallen into disrepair. Until these are repaired everytime there is a prolonged dry spell there will be restrictions and canal closures. I doubt CRT (BW mark 2) will have the financial resources to repair them all, as they run to around 10 miles in total, with about 2 miles working. Working feeder streams, Rossendale brook into Sutton resevoir, Swallowdale brook and another stream into Bosley. There is a small feed into the canal at Clarke Lane Bollington. In the acts of Parliament for the construction of the Macc ,the canal company had the authority to construct 5 resevoirs.
When we last went down Bosley locks in our boat(now sold) in 2014 there were leaks in a number of gates and masonry walls! Nothing has changed.