Risk assessment of runoff sediments in an experimental catchment in Bogotá related to hydrological and granulometric characteristics

Introduction. Urban runoff sediments contain heavy metals that generate risk to the environment. Several assessment indexes for have been developed, which show level of contamination particles in environment and their origin. Besides, sediment is also associated with particle size distribution hydrometeorological characteristics. Objective. This work seeks evaluate from collected an experimental catchment, related hydrological characteristics area influence. Materials methods. The field laboratory experiments were carried out on constructed-wetland/ storage-tank structure Pontificia Universidad Javeriana, Bogotá. data obtained a nearby El Paraíso rain gauge station. geoaccumulation (Igeo), pollution index (PI), enrichment factor (EF) rates calculated. Furthermore, Principal Component Analysis was used order determine relationships between risk, granulometric variables. Results. There low/medium Cu Cr, contrast high Pb Zn. According multivariate statistical analysis, there relationship average diameters (D50): these increase fine periods rainfall intensity. Conclusions. variables are important risks urban sediments. In this study, we found variable dry weather values geo-accumulation contamination. findings reinforce possibility developing early warning systems using key sedimentological