Corvera-Gomringer, Ronald

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    Aportación de nitrógeno, fósforo y sedimentos suspendidos durante eventos de tormenta en micro cuencas Del Río Grande de Añasco, Puerto Rico
    (2005) Corvera-Gomringer, Ronald; Sotomayor-Ramírez, David; College of Agricultural Sciences; Pérez Alegría, Luis R.; Martínez Rodríguez, Gustavo; Muñoz Muñoz, Miguel A.; Department of Agricultural and Biosystems Engineering; Zapata López, Raúl E.
    Three of the most important contaminant agents related to non-point sources are suspended sediments, nitrogen and phosphorus. This study quantified the concentration and discharges of total Kjeldhal nitrogen (TKN), total phosphorus (TP), dissolved phosphorus (DP), and suspended sediments (SS) during storm events (runoff) in two sub watersheds: Miraflores (224 ha) and Cerro Gordo (714.7 ha), which are part of the greater Río Grande de Añasco watershed in Puerto Rico. Storm events were monitored from August 2003 until July 2004. The outlets of each sub watershed were instrumented with ISCO® 3700 automatic sampling equipment, and a pressure transducer ISCO® 4200. Average concentration values for SS were 1552 mg L-1 and 2738 mg L-1 for Miraflores and Cerro Gordo sub watersheds, respectively. Average concentrations of TP exceeded 0.1 mg L-1 (limit threshold suggested for eutrophication) for both sub watersheds, with values of 0.34 and 0.48 mg L-1 for Miraflores and Cerro Gordo, respectively. Average TKN concentrations were 1.70 mg L-1 for Miraflores, and 3.15 mg L-1 for Cerro Gordo. These high concentrations suggest that nutrients come from non-point sources such as rural unsewered homes, and farm animals in both sub watersheds, and intensive agricultural activities in the Cerro Gordo. Discharges of SS, TP, DP and TKN (kg ha-1) in the Cerro Gordo sub watershed were 4.5, 1.7, 1.5 and 2.3 times higher than those in Miraflores, respectively.