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Conclusions The reliable determination of the recurrence of outstanding maximum flows is entirely governed by the accuracy in the construction of the frequency curve in the upper zone (i.e., the reliable calculation of small-frequency maximum flows), which, under the present conditions, the science of hydrology cannot guarantee with sufficient trustworthiness. For this reason we may talk only of the determination of the recurrence of outstanding maximum flows, corresponding to a given method of analysis. In this investigation all the analyses were made in strict accordance with the methods presented in the SNiP II-I. 7-65 norms.The investigation showed that in the methods recommended in the SNiP II-I. 7-65 norms for calculating the maximum flows, there is no basis for increasing the design probability (that is, for lowering the design flows) contemplated in the current norms for Class I and II structures.For many rivers, the existing norms yield excessively low values of the design maxima. Therefore, a basic task for increasing the reliability in the determination of the maximum flows is the development of methods for calculating those of combined origin and the formulation of recommendations for the selection of the design values of the asymmetry coefficient by considering in fuller detail the specific conditions of formation of large flows in different types of rivers.
Conclusions The reliable determination of the recurrence of outstanding maximum flows is entirely governed by the accuracy in the construction of the frequency curve in the upper zone (i.e., the reliable calculation of small-frequency maximum flows), which, under the present conditions, the science of hydrology cannot guarantee with sufficient trustworthiness. For this reason we may talk only of the determination of the recurrence of outstanding maximum flows, corresponding to a given method of analysis. In this investigation all the analyses were made in strict accordance with the methods presented in the SNiP II-I. 7-65 norms.The investigation showed that in the methods recommended in the SNiP II-I. 7-65 norms for calculating the maximum flows, there is no basis for increasing the design probability (that is, for lowering the design flows) contemplated in the current norms for Class I and II structures.For many rivers, the existing norms yield excessively low values of the design maxima. Therefore, a basic task for increasing the reliability in the determination of the maximum flows is the development of methods for calculating those of combined origin and the formulation of recommendations for the selection of the design values of the asymmetry coefficient by considering in fuller detail the specific conditions of formation of large flows in different types of rivers.
Design probability of maximum flows
Kovalev, L. M. (author)
1971
Article (Journal)
English
BKL:
56.30
Wasserbau
Local classification TIB:
770/6550/8000
Design probability of maximum flows
| Springer Verlag | 1971
| Engineering Index Backfile | 1928
| Engineering Index Backfile | 1927
| British Library Conference Proceedings | 1997
| British Library Conference Proceedings | 1997