DelAgua OXFAM-DELAGUA, Руководство пользователя

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OXFAM-DELAGUA Water Testing Kit — Users Manual
13
2 Sampling Programmes
2.1 Selection of sites and frequency of sampling on a network supply
Samples should be taken from locations
that are representative of the water
distribution network and household
connections.
Where there are several sources and a
mixed distribution system, it is
necessary to take account of the
variation that may exist in the system
and incorporate this into the sampling
programme.
Where there is a branched distribution
system, samples should be taken at
random points evenly spread throughout
the system.
Where there are main branches and a
remote periphery (as shown), greater
attention should be devoted to the main
branches and remote points in the
network.
The recommended minimum frequencies for sampling of both piped supplies and
point sources are shown in the tables below:
Minimum Frequency of Sampling and Analysis of Piped Water Supplies
Population served
Minimum frequency of sampling
Less than 5,000 One sample per month
5,000 to 100,000 One sample per 5,000 population per month
More than 100,000 20 samples monthly plus one extra sample per 10,000
population
Location of key sample points on a network distribution
system.