Abstract
1. A mixed zone of hydraulic resistance expressed by the relation (7) and characterized by ascending curves of resistance is characteristic of unlined canals in cohesive soils and in a sand bed. 2. The quadratic formulas of Manning, Pavlovskii, and other authors along with the Al'tshul' “generalized” formula presently used for calculating the Chezy coefficient do not correspond to the real nature of hydraulic resistance of unlined canals. Their use for hydraulic calculations of unlined canals is not guaranteed against gross errors. 3. Conditions (11) and (12) are not applicable to unlined canals. 4. Relation (15) for values (19), (20) of the parameters constant in the entire range of actual data covered corresponds to the real zone or resistance of unlined canals with its real characteristics, which explains the marked decrease of the deviations of the calculation from the actual introduced by it. 5. The results of the present work along with works [7, 8, 9] are a further confirmation of the validity of replacing the generally accepted relation (2) by relation (7) and representing the latter in the form of (14) or (15).
Published Version
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