A specific analysis was carried out to analyze the number and average magnitude of the events that are characterized by EPR = 0 and EPR = 1. Table 2 summarizes results of this analysis for the demand scenario d =1, as an example. The number of events N for which EPR = 0 is observed to decrease monotonically from 57 (80% from 71 in total) to 22 (31%) as the storage fraction s increases from 1 to 10 (i.e., as the tank size increases). For the same reason, the number of events with EPR = 1 increases from 5 (7%) to 44 (62%). These results are consistent with those obtained by Gerolin et al. (2010) for a rainfall series with characteristics very different from those used in this paper. In particular, according to the authors, the top 30 events of the rainfall series of Greenwich, UK showed the tank (estimated s =26 and d =1.3) to provide EPR = 0 and EPR = 1 for 44% and 6% of the events, respectively.

Table 2

Number and average magnitude of the events for EPR = 0 and EPR = 1

 s =1 s =3 s =10 
 N (-)hav (mm/h)N (-)hav (mm/h)N (-)hav (mm/h)
EPR = 0 57 23.1 45 23.3 22 30.5 
EPR = 1 14.4 16 18.7 44 22.9 
 s =1 s =3 s =10 
 N (-)hav (mm/h)N (-)hav (mm/h)N (-)hav (mm/h)
EPR = 0 57 23.1 45 23.3 22 30.5 
EPR = 1 14.4 16 18.7 44 22.9 

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