Being man-made flat ditches that lose water every time someone uses a lock (and there are many locks), how do the British canals stay full of water? This video attempts to shed some light.
Footage credits (all used with permission)
Derbyshire Police www.youtube.com/c/derbyshirepolice
RAF Odiham www.youtube.com/channel/UCjmGN_HvU_LrV8pCJuyP8Xw
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