Resumo

FABREGA D., José R.; PINZON, Reinhardt; VALLESTER, Erick  e  VEGA, David. Rainfall - CN (Curve Number) relationships in a tropical rainforest microbasin within the Panamá Canal watershed. Rev.fac.ing.univ. Antioquia [online]. 2012, n.62, pp.170-176. ISSN 0120-6230.

Precipitation (P) Curve-Number (CN) relationships for different base flow ranges, obtained within the upper Chagres River watershed were applied to a 6.5 Ha microbasin located within the Panamá Canal watershed. These relationships estimate CN values from P data employing an equation established by Calvo et al (10). This equation uses k and CN_∞ as fitting parameters. Rainfall/Runoff data from the microbasin, collected over a six-month period, were analyzed. These analyses showed that CN values at the microbasin are closer to CN results predicted by the equation corresponding to the lower base-flow range (14-42 m³/s) at the upper Chagres watershed. These results were explained by considering not the absolute values of the base flow (Q_base), but the value of this parameter relative to the basin area under study.

Palavras-chave : Precipitation; Panamá Canal watershed; curve number; tropical hydrologye.

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