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R Comprehensive Assessment of Emergency Medical Services 70 DRAFT REPORT and 911/Communications Center Operations Study Figure 42 Call Rate per Hour of Day/Year 14,000 r- t.rt_rl.rY rT-Y, ry'r�'r�'re_.r� 'q, ,.'. .r,'.i.i• 12,5$6 ry`r� 1 1 f I I I Y I 1 1 1 ! e l t t l 1 it,000 -r —1 1 4 1— + + 4 t ! 1 1 • I r 1'i I f l l l l # f r 1 1 1 t 1 1 1 1 1 1 l i l t l I t # 1 1 1 1 1 1 M I Y I 1 f + ! f !�y I l l • I Y ! i i / 1 1 1 / f I 1 � � 1 1 f 1 i t 10,000 J i^ 1.L1 1-4J_1 J_4 J^f 1_L J_Vy 1_ _LJ_i J A J 4J Li_1_ J ! 8,000 - _'-1'i_- -1 1 . - 1-1-_f__i-;1 €-1-i 1 -i 1'j 1'•�i i I I Y I Y l f l 1 1 1 1 1 1 1 f / , I , I I I Y ! • , f , i - . ! i ; , ; f i l Y l t l r l ! 1 ' I 1 i 6,000 �-r>'-r♦-rt-r l-r♦-rr^r r-r-r�-rs-r�-r-1-r�-r��r r Busiest 12-Hours 4,000 wi-f•.l+1-♦ ti�TF r.1-}.! t..;-r. ^b.�_M;_4 a+k+. 1 2,000 i 2964 11!) E 1 1 1 i i t I . � s r r r r l f � r r l , , I r ! • I � r 1 2 3 4 5 6 7 8 9 10 11 12. 13 14 15 16 17 18 19 20 21 22 23 24 --+•-1-2009 —i•—xoaa z�ii The "hour of day" is indicated along the bottom of the graph by the numbers "1" through "24". As an example, all calls received between 11:00 pm and Midnight are indicated on the vertical axis extending upward from "24". Based on these findings the lowest call volume per hour/year has consistently been between 4:00 am- 5:00 am (2,964 in 2011). The highest call volume per hour has consistently been between 5:0 pm-6:00 pm (12,586 in 2009 and 2010). Not surprisingly,the busiest 12-hours of the day for the Communications Center is the same as that identified for EMS; 9:00 am-9:00 pm. For all 3 of the years considered, the call volume between 9:00 am-9:00 pm was never less than 8,000 calls per hour. Figure 43 Peak Hour Call Load/Month Peak Hour Call Load 300 ,.-...,_.,.....--------- ....... ----_-------,._.:- ,___- ....... Again, an important variable in calculating j ; zoi ; eventual staffing and subsequent work- 107 250 i 9 ' tz° 2#7 226 ;2Ji3 ;toa z33 I tda i tig xbx load requirements is the total number of 200 `# calls received during the busiest hour of theday.--•�--------------�-----•--�---__.,.-------- rr . too While the average peak hour call load per hour over the past three (3) years has so . . been 200 calls or 3.3 calls/minute; the peak hour call load for the 36 months fan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec studied was 247 calls, a rate of 4.1 calls -.-•2009 -0-2010 -.-2011 per minute. Solutions for Local Government,Inc. 68