3.1.3. Operational aspects of indicator sampling
Surveys of stormwater contamination by wastewater are typically
conducted by sampling of flows in the stormwater system,
using either grab sampling or on-line monitoring. Both methods
have advantages and disadvantages as discussed below.
The main advantage of grab sampling is the broad choice
of parameters, for which such samples can be analysed in
the laboratory, including the earlier identified strong
indicators. On the other hand, the measurement of water quality
constituents in grab samples suffers from several significant
drawbacks: