Modified rational method for sizing infiltration structures

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A simple method is presented to size infiltration structures like infiltration basins and trenches to control storm water runoff. The runoff hydrograph is assumed to be trapezoidal in shape with a peak runoff rate calculated using the rational formula. Given the watershed time of concentration and the allowable runoff rate, the method determines the required size of the infiltration structure. A practical application section is included to demonstrate the use of the method.Key words: rational method, infiltration basin, infiltration trench, capture volume, storage time.

Une méthode simple est présentée afin de dimensionner des structures d'infiltration telles que des bassins ou des tranchées d'infiltration pour le contrôle des écoulements d'eau de pluies. L'hydrogramme d'écoulement est assumé être de forme trapèzoïdale avec un taux d'écoulement de pointe calculé en utilisant la formule rationnelle. Pour un temps de concentration du bassin et un taux d'écoulement permis donnés, la méthode détermine les dimensions requises pour la structure d'infiltration. Une section avec une application pratique est incluse dans l'article afin de démontrer l'utilisation de cette méthode.Mots clés : méthode rationnelle, bassin d'infiltration, tranchée d'infiltration, volume d'emmagasinement, temps de rétention.[Traduit par la Rédaction]
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  • Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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