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Hydro-geomorphological hazard in catchments of the waraira repano national park south hillside, Distrito Capital, Venezuela

Abstract:

Repeatedly, the flashfloods occurred in the Catuche, Anauco and Gamboa creeks and in the Cotiza river have severely affected neighborhoods and urban areas settled on their alluvial fans. Hence, it is necessary to assess the hydro-geomorphological hazard in their catchments and particularly the generation of flashfloods. The methodology considered the evaluation of the hydraulic conditions of the main channels and levels of human intervention, geomorphological photo-interpretation, characterization of rainfall patterns, measurements and calculations of morphometric parameters of the catchments, estimation of the concentration times, analysis of extreme rainfall events and estimation of flashflood peak discharges. Sudden hydrological responses are controlled by the morphometric parameters of the catchments and their drainage networks, as well as the dimensions of storms and the intensity and duration of rainfalls, which form significant flashflood peak discharges for different return periods.