Comparison of estimated and observed stormwater runoff for fifteen watersheds in west-central Florida, using five common design techniques

Trommer, J.T.; Loper, J.E.; Hammett, K.M.; Bowman, Georgia

doi:10.3133/ofr96129

Cited by 4 publications

(1 citation statement)

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“…The Rational method is based on a simple formula that relates runoff-producing potential of the watershed, the average intensity of rainfall for a particular length of time (the time of concentration), and the watershed drainage area. The rational formula is described by the following equation [Trommer et al 1996]: -3 (1)…”

Section: Methodsmentioning

confidence: 99%

Influence of time of concentration on variation of runoff from a small urbanized watershed

Wałęga¹,

Cupak²,

Amatya³

2015

GLL

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The main objective of the paper is to estimate the influence of time of concentration (TC) on maximum flow in an urbanized watershed. The calculations of maximum flow have been carried out using the Rational method, Technical Release 55 (TR55) procedure based on NRCS (National Resources Conservation Services) guidelines, and NRCS-UH rainfall-runoff model. Similarly, three methods were used to calculate the overland flow component of the TC: the Kerby method, the Morgali and Linsley method and the NRCS travel time method. The TC was calculated in a watershed located in Krakow city in Poland, małopolskie voivodeship. Total area of the watershed has about 180 ha. It's a highly urbanized watershed with a significant land cover (29.6% of total area) influencing the runoff, in the form of an impervious industrial area. The highest value of time of concentration was achieved for Morgali and Lindley method in case of the subwatershed with dominant pervious areas, as opposed to the NRCS method for the subwatershed with dominant impervious areas. The highest value of TC was obtained for NRCS method. With reference to the whole watershed, the highest values of the time of concentration were obtained for the MorgaliandLindley method and the lowest for the Kerby formula. Based on this study, authors recomended the Kerby method for estimating TC for overland surface dominated areas because this method requires only a small number of input parameters, that are straightforward to estimate.

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Section: Methodsmentioning

confidence: 99%