The values stored in this table indicate summary attributes (i.e. hydrants, customers, and total volume of consumption interrupted) for each isolation block in the network. It is expected that the number of records in Table 3 will be the same as the number of isolation blocks in the network. However, it is noted that the records stored in Table 3 are not required for the purpose of calculating a main isolation solution (i.e. determining which valve or valves must be closed to isolate a specific main); but only for display of the summary attribute information on the Map View screen in Main Isolation mode.
When a calculated main isolation solution would affect multiple blocks in the network, these summary attributes are aggregated when displaying summary information.