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These values were then used to determine the microbial performance targets shown in Table 2. Specific exposure data can also be used as an alternative to the defaults shown in Table 2.

Table 2

Log10 reductions for end uses from the Parafield stormwater harvesting system

  Exposure/FrequencyLog10 reduction targetsb
OptionRoute of exposureevent (L)a(events/yr)aRotavirusCryptosporidiumCampylobacter
Restricted open space irrigation Ingestion of sprays 0.001 50 1.6 0.6 1.2 
Non-potable domestic use and unrestricted irrigation Ingestion of water and sprays 0.67 2.7 1.8 2.3 
Drinking Ingestion of water 365 5.8 4.8 5.3 
  Exposure/FrequencyLog10 reduction targetsb
OptionRoute of exposureevent (L)a(events/yr)aRotavirusCryptosporidiumCampylobacter
Restricted open space irrigation Ingestion of sprays 0.001 50 1.6 0.6 1.2 
Non-potable domestic use and unrestricted irrigation Ingestion of water and sprays 0.67 2.7 1.8 2.3 
Drinking Ingestion of water 365 5.8 4.8 5.3 

aDefault assumptions (after NRMMC-EPHC-AHMC 2006).

bTotal residential use (garden plus internal) after NRMMC-EPHC-AHMC (2006). Total consumption is assumed to be 2 litres per day, of which 1 litre is consumed cold. Affected individuals may consume water 365 days per year. A conservative estimate of 1 in 1,000 houses with cross-connections has been considered (NRMMC-EPHC-AHMC 2006).

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