Keeping Gravel Out of Canal Mouths
Note on clearing river-fed canal intakes, with a sketch of a vaulted gallery
A red-chalk sketch of an arched, vaulted gallery over water sits above a note on canal engineering. The transcription addresses how to keep the mouths of canals dug from rivers from filling with gravel, and how to prevent gravel from settling at the foot of the barrier built against it, using a slope described as 'transverse'. The drawing shows the barrel-vaulted structure in perspective, its arched opening rising from the water.
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Preventing gravel from choking canal intakes
The note seeks a way to keep the mouths of canals drawn off from rivers from silting up with gravel, and to stop gravel from settling at the foot of the protective barrier. The proposed remedy is a sloped, transverse arrangement that keeps the material moving.
Vaulted gallery construction
Above the note, an arched barrel-vaulted gallery is drawn in perspective, its mouth opening toward the viewer. The e-Leo heading labels the drawing a gallery construction, apparently a covered channel related to the canal work.