The horse powered dredge boats are interesting to compare to today's technology. They don't specifically give dimensions, but considering the space it takes one

The horse powered dredge boats are interesting to compare to today's technology. They don't specifically give dimensions, but considering the space it takes one horse to walk, plus some extra space for dredging and boat functions, it is easy to place 750 watts of solar panels in the same space. You could make solar powered dredge boats which would be functionally equivalent to the horse boats. You'd only dredge when the sun shines, but you also wouldn't have to stop and change horses every hour and maintain dozens of horses per boat. You would get a good 4-5 months of dredging 4 hours/day, and you'd get to take December and January off! (or operate a fraction of an hour a day). You'd need about 20 thousand of the boats to keep up with current demand, so that might be a traffic congestion problem during the summer months.