oa Civil Engineering = Siviele Ingenieurswese - Hydrological myths
|Article Title||Hydrological myths|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Civil Engineering = Siviele Ingenieurswese|
|Affiliations||1 University of the Witwatersrand, Johannesburg, South Africa|
|Publication Date||Jul 1982|
|Pages||377 - 383|
|Keyword(s)||Drainage systems, Flood estimation, Floods, Overland flow routing, Storm duration hydrographs and Storm intensity|
Hydrological techniques for the estimation of floods have not advanced much since the development of unit hydrograph methods in the 1930s. The technique of discounting losses using a coefficient has been readily adopted without a great deal of thought. The linear hydrological methods have all sprung from the same reasoning. It is invariably assumed that the design storm for any catchment is that with a duration corresponding to the travel time down the catchment. The flood due to 2 mm of effective rainfall Is assumed to be twice that due to 1 mm of rainfall.
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