| A semiempirical estimate of chute length for a 1000 | Current | Percent of runners | Number of runners | Number of runners | Runners | Runners | Chute length | |||||||
| runner 5K. | Interval | entering chute in | entering chute in | cumulative | processed | still in chute | ||||||||
| Ending | current minute | Interval | ||||||||||||
| The following input is from Mike Early of Charm City Run | ||||||||||||||
| According to RRCA queuing data, runners occupy an area | 15 | 0.001 | 1 | 1 | 2 | 0 | 0 | |||||||
| two square feet. | 16 | 0.001 | 1 | 2 | 4 | 0 | 0 | |||||||
| Mike also provided a runner processing rate of | 17 | 0.002 | 2 | 4 | 6 | 0 | 0 | |||||||
| 2 runners per minute,and he uses a chute width of 10 feet. | 18 | 0.004 | 4 | 8 | 8 | 0 | 0 | |||||||
| Model Assumptions: | 19 | 0.006 | 6 | 13 | 10 | 3 | 1 | |||||||
| Based on experience, our model assumes a normal distribution, | 20 | 0.009 | 9 | 22 | 12 | 10 | 2 | |||||||
| with a mean at 30 minutes and a standard deviation of 5 minutes, | 21 | 0.013 | 13 | 35 | 14 | 21 | 4 | |||||||
| Each incoming runner adds 2sq ft in the chute, and | 22 | 0.019 | 19 | 54 | 16 | 38 | 8 | |||||||
| we assume a runner processing rate of 2 runners per minute, | 23 | 0.026 | 26 | 80 | 18 | 62 | 12 | |||||||
| Input | 24 | 0.034 | 34 | 114 | 20 | 94 | 19 | |||||||
| Number of runners | 1000 | 25 | 0.044 | 44 | 158 | 22 | 136 | 27 | ||||||
| Runners processed per minute: | 2 | 26 | 0.053 | 53 | 211 | 24 | 187 | 37 | ||||||
| Chute Width | 10 | 27 | 0.062 | 62 | 274 | 26 | 248 | 50 | ||||||
| Results | 28 | 0.070 | 70 | 344 | 28 | 316 | 63 | |||||||
| Early arrivals appear between 14 and 15 minutes, and | 683 | 29 | 0.076 | 76 | 420 | 30 | 390 | 78 | ||||||
| (approximately 2/3) of the runners enter the chute between 25 | 683 | 30 | 0.079 | 79 | 499 | 32 | 467 | 93 | ||||||
| and 35 minutes. The (required) chute length increases | 31 | 0.079 | 79 | 579 | 34 | 545 | 109 | |||||||
| monotonically until the 42nd minute, reaching a maximum: | 187 | feet. | 32 | 0.076 | 76 | 655 | 36 | 619 | 124 | |||||
| 33 | 0.070 | 70 | 725 | 38 | 687 | 137 | ||||||||
| 34 | 0.062 | 62 | 787 | 40 | 747 | 149 | ||||||||
| 35 | 0.053 | 53 | 841 | 42 | 799 | 160 | ||||||||
| 36 | 0.044 | 44 | 884 | 44 | 840 | 168 | ||||||||
| 37 | 0.034 | 34 | 919 | 46 | 873 | 175 | ||||||||
| 38 | 0.026 | 26 | 945 | 48 | 897 | 179 | ||||||||
| 39 | 0.019 | 19 | 963 | 50 | 913 | 183 | ||||||||
| 40 | 0.013 | 13 | 977 | 52 | 925 | 185 | ||||||||
| 41 | 0.009 | 9 | 985 | 54 | 931 | 186 | ||||||||
| Peak chute length starts at 42 minutes --- | ---------------- | ---------------- | ---------------- | ----------------> | 42 | 0.006 | 6 | 991 | 56 | 935 | 187 | |||
| 43 | 0.004 | 4 | 995 | 58 | 937 | 187 | ||||||||
| 44 | 0.002 | 2 | 997 | 60 | 937 | 187 | ||||||||
| 45 | 0.001 | 1 | 998 | 62 | 936 | 187 | ||||||||
| 46 | 0.001 | 1 | 999 | 64 | 935 | 187 | ||||||||
| 47 | 0 | 999 | 66 | 933 | 187 | |||||||||
| MSTI Home page | 48 | 0 | 999 | 68 | 931 | 186 | ||||||||
| 49 | 0 | 999 | 70 | 929 | 186 | |||||||||
| 50 | 0 | 999 | 72 | 927 | 185 | |||||||||
| 51 | 0 | 999 | 74 | 925 | 185 | |||||||||
| 52 | 0 | 999 | 76 | 923 | 185 | |||||||||
| 53 | 0 | 999 | 78 | 921 | 184 | |||||||||
| 54 | 0 | 999 | 80 | 919 | 184 | |||||||||
| 55 | 0 | 999 | 82 | 917 | 183 | |||||||||
| 56 | 0 | 999 | 84 | 915 | 183 | |||||||||
| 57 | 0 | 999 | 86 | 913 | 183 | |||||||||
| 58 | 0 | 999 | 88 | 911 | 182 | |||||||||
| 59 | 0 | 999 | 90 | 909 | 182 | |||||||||
| 60 | 0 | 999 | 92 | 907 | 181 | |||||||||
| Total = | 0.999 | 999 | ||||||||||||