Environmental Engineering Reference
In-Depth Information
contaminated raw water is governed by short-term peak concentrations, the analysis
for composite samples may reflect peak concentrations in sub-samples analyzed for
a storm event. Additional flow-weighted samplings of stormwater events, with
analysis of discrete sub-samples, are thus needed to describe the variability in
stormwater flows for discrete event.
Conclusion
From this study we mainly conclude that stormwater ponds perform well in the
reduction of traditional stormwater pollutants including suspended solids, some
nutrients and heavy metals. The removal of microorganisms was however negligible
for the faecal indicator bacteria. The increase in the pond of somatic and F-specific
coliphages, used as a model organisms for virus, show that stormwater ponds does
not represent an efficient microbial barrier. Further studies must be carried out to
investigate the microbial removal efficiencies in other stormwater ponds and the
microbial impact from birds and animals potentially residing in the pond. Analyzing
subsamples from the course of the storm events are needed for describing the
microbial variability over time.
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