Resumen

MARMOL, L; DIAZ, J; LARREAL, M  y  JIMENEZ, L. Hydric erosion evaluation at the micro basin of Roja and Colorada creeks in the Valmore Rodriguez municipality, Zulia state. Rev. Fac. Agron. [online]. 2007, vol.24, n.2, pp.183-202. ISSN 0378-7818.

The soils besides of being the production basement of foods for mankind, plays a main role, next to the vegetable covering, in the hydrological regime of the superficial waters. For that purpose they should be evaluated, to establish the necessary measures that guarantee the basins conservation that will permit to maintaining and/or improving the quantity and the quality of the produced water, as well as to increase the life span of the dams. For these reason a soil erosion survey was carried out in the micro basin of the Roja and Colorada creeks, located in the Pueblo Viejo river basin, Zulia state, Venezuela. Aerial photographs were characterized to scale 1:25.000 and the interpretation tones changes and drainage density, in order to classify the study area according to the type and degree of soil water erosion. Fields checkups were made to verify the photo interpretation and finally a map of current erosion was generated. Results showed the existence of a surface of 872,27 ha (22,24%) without erosion, 371,08 ha (9,46%) with light erosion, 1.908,34 ha (48,66%) with moderate erosion, 707,03 ha (18,04%) with strong erosion and 62,81 ha (1,60%) with severe erosion. We can conclude that land use without considering its capacity is one of the most important factors that promote the erosion in the study area.

Palabras clave : water erosion; basin; soils conservation.