versión On-line ISSN 0718-0764
This study determines the influence of sample size in estimation of the rain factor R used for the design of hydraulic projects. A total of 228 pluviometric records available in Mexico were analyzed , and the one to 24 hour (R) relationship was determined. The records were taken at the pluviometric station of Tacubaya, Mexico, covering the period 1970 to 1996. When the recording period is less than 20 years, the R ratio tends to vary significantly, and events used in the design of hydraulic projects can be underestimated or overestimated. For records of longer than 20 years, the R ratio becomes stable. It is concluded that it is possible to determine the error incurred in the estimation of costs over a certain period of return for the design of a hydraulic project
Palabras clave : hydraulic projects; rainfall intensity; rain factor R; duration-frequency; statistical evaluation.