张千千(2),王效科*
Abstract
There is an urgent requirement to examine the
quality of harvested rainwater for potable and non-potable purposes, based on
the type of roo ? ng material. In this study, we examined the effect on thequality
of harvested rainwater of conventional roo ? ng materials (concrete, asphalt
and ceramic tile roofs)compared with alternative roo?ng materials (green roof).
The results showed that the ceramic tile roofwas the most suitable for rainwater-harvesting applications
because of the
lower concentrations ofleachable pollutants. However, in this study, the
green roof was not suitable for rainwater harvestingapplications. In addition,
seasonal trends in water quality parameters showed that pollutants in roofrunoff
in summer and autumn were lower than those in winter and spring. This study
revealed that thequality of harvested rainwater was signi ? cantly affected by
the roo ? ng material; therefore, local government and urban planners should
develop stricter testing programs and produce more weatheringresistant roo ? ng
materials to allow the harvesting of rainwater for domestic and public uses.