Folio 12
About this site
A demonstration site. The canal, the locks and the keepers are invented.
Notice
- Tarnwick, the Tarnwick Canal, its locks and its keepers are invented for a design exercise.
- Times, tolls and closures are fixed for Thursday 15 October 2026, 09:00 BST.
- Nothing is booked, paid or sent. Inputs stay in the address bar.
- Do not use these figures on a real canal.
Figures
- Chamber sizes
- In the range of English narrow canals: 21 to 22 m by 2.1 to 2.2 m.
- Widest boat
- Chamber width less 0.07 m.
- Deepest draught
- Depth over the cill less 0.10 m.
- Time per lock
- Fill time (empty time is 1 min less) plus 5 min for the gates.
- Time between locks
- Pound length at 40 m a minute.
- Boats ahead
- 18 min each: one turn at the slowest lock.
- Water per fill
- Chamber length × width × fall, rounded to the cubic metre.
- Drawings
- Section and profile are drawn from the figures on each page; heights are exaggerated about twice.
Photographs
| Photograph | From | Link | Licence |
|---|---|---|---|
| Looking up a flight from the towpath, a brick hut beside the chamber | Unsplash | Source page | Unsplash License |
| Looking up a pound to the bottom gates | Unsplash | Source page | Unsplash License |
| Balance beams and paddle posts at a tail | Unsplash | Source page | Unsplash License |
| Bottom gates and a white footbridge | Unsplash | Source page | Unsplash License |
| Water spilling over closed gates into the chamber below | Unsplash | Source page | Unsplash License |
| Early mist on a flight, a narrowboat moored below | Pixabay | Source page | Pixabay Content License |
| A short pound below a lock and cottage | Pixabay | Source page | Pixabay Content License |
| Narrowboats moored in morning mist | Unsplash | Source page | Unsplash License |
| A lock cottage beside the tail of a lock | Unsplash | Source page | Unsplash License |
Drawings are made from the figures on each page. No names, logos or marks of real canal bodies are used.