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 348
318 SURVEYING, in Fig. 82, and it seffect in increasing the depth on the weirfor a given discharge. If the crest has a width equal to theHne 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…
Surveying
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