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Comprehensive Assessment of Emergency Medical Services 113 and 911 /Communications Center Operations Study Figure 42 Call Rate per Hour of Day /Year 14,009 -t- r-t - rT- r-T - rT- r7 --q-r-i - ri- r-1-rl -r-1 -. 1 I . I I I I I I I I 2,586 12,000 ! 1 I I, I ,, 1, 1, I., 1 1, 1 Y I ! 1 1 1! ^,^ y 1; 1 F -1 1, 1 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1, 1 1 1 1 + . -1 4 -1 IrI 16,0011) 1 1 •1 � 1 1 1 1 1 1 1 1 1 1` I L I I 1�! I TI 1 1 1 1 1 1, 1 • 1 1 1, 1 1 1 1 I 1 1 • - 1 1 1 1 1 I I 1 1 80000 4000 ♦ ; , Busiest 12 -Hours ; 1 4,000 -~ - -Fi -Fi -F LJ -♦-a -M1 a -. - La -�J_I 1 1 1 1 1 1 1 1 1 I I I, I I( 1 1 1 1 1 1 1 1 1 1 1 1 1••• 1 1 1 1 1 1 X 1 1 1 1 1 r 1 1 1 1 1 1 1 1 1 1 r l r 1 1 1 1 1, 1 1 1 1 1! 1 1 1 1• -, I I I I I��/ I I Y X000 JAL 2 964 , LJ- �J- 41'LJ- �J- LJ- IJ.IJ.L� -4J -, LJ_rJ.IJ.� �LJ�L I I 1 1 1 I 1 1� 1 1 1 1 1 1 1 1, 1, 1 1 1• 11, 1, 1� 1 1 1 11 . ,11111 11111111,1,111 I. 11,111 .I I. YI 1,11111 1 111111,1 I ,lf.. . 1111 1 I 11111 11 Y 1 1 Ir 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 16 19 28 21 22 23 24 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 5:00 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. Peak Hour Call Load Again, an important variable in calculating eventual staffing and subsequent work- load requirements is the total number of calls received during the busiest hour of the day. While the average peak call load per hour over the past three (3) years has been 200 calls or 3.3 calls /minute; the peak hour call load for the 36 months studied was 247 calls, a rate of 4.1 calls per minute. Figure 43 Peak Hour Call Load /Month Sao 247 237 233 250 220 226 219 199 197 203 204 204 202 200 ; -- -r ........•...I.. ; loo - F-- ;-- ;- -; - - -, -- F - -' --' ' ' - - -, I _, so 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec t2009 — 2010 -x2011 Solutions for Local Government, Inc. 69