Resumo

PEREZ NIETO, Samuel et al. Runoff curves for three micro-watersheds of the Huixtla basin, Chiapas, Mexico. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.8, pp.1729-1742. ISSN 2007-0934.

The estimate of runoff depth is an intermediate calculation methodologys for various hydrologic designs of hydraulic works; a method for calculating this parameter is the number of runoff curve (Nc) that has been widespread in the world due to its considerations and easy application. In this work developed in 2013, were obtained in the field the Nc in three micro-watersheds implemented in the basin of the Huixtla River in the coast of Chiapas, Mexico. The micro-watersheds were Rosita with acahual with forest coverage, Hannover with shaded coffee and Berriozábal with maize and acahual; in the three micro-watersheds, the texture is sandy-loam and its average slope ranges from 23-33%. Nc estimation was made in tables SCS from land-use, hydrological conditions and soil hydrological or group; corrections were made by the antecedent moisture (CHA) and slope of the terrain and were compared with the values of Nc calculated from data measured in field of hasty sheets (Lp) and runoff sheet (Le) 20, 82 and 27 events for micro-watersheds Rosita, Hannover and Berriozábal, respectively. It was concluded that, the Nc values obtained from SCS tables for conditions such as micro-watersheds Rosita, Hannover and Berriozábal, corrected by antecedent moisture and slope should add 11, 9, and 6 units respectively, as otherwise, we could be underestimating the flood design.

Palavras-chave : coastal watershed; design flood; runoff curve identification.

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