Resumen

VELEZ UPEGUI, JORGE JULIÁN  y  BOTERO GUTIERREZ, ADRIANA. ESTIMATION OF THE TIME OF CONCENTRATION AND THE LAG TIME AT SAN LUIS CREEK BASIN, MANIZALES. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.165, pp.58-71. ISSN 0012-7353.

The San Luis creek basin is a small experimental watershed located in the urban area of the city of Manizales . It is a typical mountain basin of the Colombian Andes, which has been instrumented since few years ago. In the basin have been installed four pluviometric stations and one gauge station, where the approximate area at the outlet is 1,0 km². The temporal information is available at intervals of 5 minutes. This paper aims to estimate the time of concentration and the lag time of a small experimental basin, which is gauged and therefore can be extracted the time of concentration and the lag time from the recorded information in hydrographs and hyetographs. These values are compared with estimated values using empirical equations available in the hydrological literature. The main conclusion emphasizes that the empirical equation of the time of concentration that shows a better fit is the median value of all empirical equations. The equations of Kirpich, Passini , California , SCS and Ventura-Heras are more conservative for hydrological design because show lower time values and therefore faster hydrological responses. In terms of lag time, there is an approximate ratio of 0,6 over the average estimated time of concentration.

Palabras clave : Urban hydrology; time of concentration; lag time.

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