The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 347
ING. in Fig. 82, and it seffect in increasing the depth on the weirfor a given discharge. If the crest has a width equal to theline ab in Fig. 81, then the depth on the weir is unaffected,while if it has a less width, as in Fig. 83, and if the air has notfree access to the intervening space… … Fig. 85. those of normal flow, the full lines being the new positionsassumed as a result of the partial vacuum below. A submerged weir is one at which the level of the waterbelow the weir is above its crest, there being, however, a certaindefinite fall in passing the weir, as shown in Fig. 85.…
Surveying
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