> In Lockport NY they have Drydocks that water is pumped out of to do
> repairs to barges...Do You use boat lifts or Drydocks on your canals
> and do you have photos of Drydocks?
>
Most yards use dry-docks as working (and modern) boats are usually
flat-bottomed. Traditionally dry-docks were often built next to a lock
so they could be operated like a lock (drain the water down into the
next pound to empty, let water into upper pound to refill). Such docks
are brick-built, like a lock, with timber bostocks (trestles) for the
boat to sit on so it can be worked on underneath, and may have a long
brick and tile shed built over them. Modern equivalents are concrete,
with steel roofs, emptied by electric pumps.
Boats were traditionally built on, and could be repaired on, side-slips.
This is an area of sloping ground, on which are erected about 4-5 heavy
timbers, pivoted at the middle, like see-saws. If a boat is being built
on them, they are wedged level and the boat is launched by knocking out
the wedges on the water side. Hand winches can be used to winch a boat
up on the timbers for repair; the timbers can then be jacked level. The
Black Country Museum in Dudley has a side-slip like this, in active use
when I last visited.
Sean
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