Effect of Green Roof Configuration and Hydrological Variables on Runoff Water Quantity and Quality

摘要: Green roofs (GRs) are a feasible solution for mitigating increased runoffvolumes in urban areas. Though many studies have focused their analysis on the quantity and quality of GR runoff, with respect to relevance specific site conditions performance, information gathered tropical Andes is not sufficient. This study assessed hydrological performance runoffwater 12 green roof modular systems located at Universidad de los campus (Bogota, Colombia). Based 223 rainfall events spanning 3-year period, average retention was 85% (coefficient variation = 29%). t-tests, Welch Test, multiple linear regressions, correlation were performed order assess potential effect air temperature, substrate type, vegetation cover, relative humidity, antecedent dry weather period (ADWP), duration, maximum intensity. In some cases, design variables (i.e., type cover) found be significant describing efficiencies and, depending also correlated retention. Rainfall runofffrom monitored total Kjeldahl nitrogen (TKN), nitrates, nitrites, ammonia, phosphorus (TP), phosphates, pH, dissolved solids (TDS), suspended (TSS), color, turbidity, biological oxygen demand (BOD), chemical (COD), coliforms, metals zinc, copper, nickel, lead, selenium, aluminum, barium, boron, calcium, strontium, iron, lithium, magnesium, manganese, potassium, sodium), polyaromatic hydrocarbons (PAHs). The results obtained confirmed that ability neutralize but source rest aforementioned parameters, excluding PAHs (with concentrations below detection limits), TSS, selenium where differences control cases (rainfall plastic panel runoff) statistically significant. Substrate event size, regime relevant explaining quality.