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Table 4 Monte Carlo model parameters

From: A model to assess tephra clean-up requirements in urban environments

Duration model      
Category Name Distribution a Minimum Mean Maximum
Street sweepers Operation hours Discrete 12 h 24 h
Number available Triangle 10 20 40
Sweeping speed Triangle 5 km/h 6 km/h 7 km/h
Disposal time Triangle 0.17 0.25 0.5
Efficiency factor Triangle 1 2 10
4×2 trucks Volume capacity Uniform 7 m3 7.5 m3 8 m3
Number available Triangle 1 50 100
Unloading time Triangle 2 mins 5 mins 10 mins
6 wheeler trucks Volume capacity Uniform 10 m3 15 m3 20 m3
Number available Triangle 1 50 100
Unloading time Triangle 2 mins 5 mins 10 mins
8 wheeler trucks Volume capacity Uniform 19 m3 23 m3 27 m3
Number available Triangle 1 50 100
Unloading time Triangle 2 mins 5 mins 10 mins
10 wheeler trucks Volume capacity Uniform 10 m3 37 m3 64 m3
Number available Triangle 1 50 100
Unloading time Triangle 2 mins 5 mins 10 mins
Operation hrs   Discrete 12 h 24 h
Bucket loader Scenario modelled Uniform 1 4
1 - Capacity Triangle 0.7 1.5 2.3
1 – Swing time Triangle 27 28 30
2 – Capacity Triangle 3 3.5 4
2 – Swing time Triangle 30 31.5 33
3 – Capacity Triangle 4.5 5 5.5
3 – Swing time Triangle 33 34.5 36
4 – Capacity Triangle 10 14 18
4 – Swing time Triangle 36 39 42
Cost model
 Dump trucks Distance to disposal Triangle 3 5 20
 Sweeping Cost per kilometre Uniform $45 $68 $90
  1. aDescription of various statistical distributions used for Monte Carlo modelling available at http://www.palisade.com/models/RISKDistributions.asp