Abstract
AbstractDesign of hydraulic structures involves usage of the hydrographs, which are derived from the information of rainfall history at the site. It is well recognized that the shape of the design hydrograph depends on the hyetograph used to generate it. However, for derivation of hyetograph, information regarding temporal distribution of rainfall should be available. It remains a fact that in many places of India and other developing countries, the information on temporal discretization of rainfall is not available. This has led to the adoption of curves from the literature, using which the time distribution of rainfall is derived. Recently, IMD-CWC had published temporal distribution curves for various river basins in India. The curves considered for purposes of comparison in this study include those provided by the NRCS-TR55, US Army Corps and IMD-CWC. The study indicates that the time distribution curve derived for the site from the recorded continuous hourly rainfall data for many years is significantly different from those obtained for the existing curves in the literature. It is also shown that this difference leads to either over-design or under-design of hydraulic elements. The study underlines the importance of obtaining the site-specific curves for important projects so as to carry out economical and safe designs.KeywordsTime discretizationHydrographHyetographSite-specificDesign storm
Published Version
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