Canal with two outlets; water that reverses its course
Red-chalk canal scheme (m a r - o n) with proposition 5 on water exceeding a river's dimensions
A red-chalk diagram of a canal with two outlets, labelled m, a, r, o, n, accompanies notes on drawing water off from another body of water. Leonardo argues that when the source water is of equal level and equal slope, it is the same to tap it near the place r with the fall at n as far off at m o. A pen proposition (5) repeats that water which in depth and width exceeds the general dimensions of rivers will turn back against its first course, and a second river-bed section is sketched below.
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Diagram of a canal with two outlets (m a r - o n)
Drawing off water from another body of water at equal level and equal obliquity, it is the same to take it near the place r with the fall at n as far off at m o. The scheme is drawn in red chalk with a channel and two outlets.
Water exceeding river dimensions turns back (proposition 5)
Water that in depth and width passes beyond the general width and depth of rivers will turn back against its first course.