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Estimated OCI Calculations Within Scenarios

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The scenario and network estimated OCI calculations may be weighted by the value of a particular field on the asset.

The Adjust OCI Using field on a scenario allows the user to specify which field is used for weighting the scenario and network estimated OCI calculations. The values for this field contain any integer, number, or quantity fields defined on the asset. Using this field allows an asset with greater value to have a larger impact and allows an asset with a smaller value to have less of an impact on the overall ending OCI. If each asset should be treated equally, no field should be used; select the value <None> from this list. This field is also used in the OCI calculation for Scenarios that have an OCI Target scenario type.

Example

This example shows how the network OCI is calculated.

Scenario Details

  • Asset type: Pavement
  • Adjust OCI using: Length
  • Plan year length: 1 year

Assets Within the Scenario Filter

  • Pavement segment 1 
    • Length: 10 feet
    • Estimated OCI: 70

The activity applied when running the scenario increases the segment's ending OCI to 90.

  • Pavement segment 2
    • Length: 50 feet
    • Estimated OCI: 60

The activity applied when running the scenario increases the segment's ending OCI to 70.

  • Pavement segment 3
    • Length: 30.48 meters (100 feet)
    • Estimated OCI: 60

The activity applied when running the scenario increases the segment's ending OCI to 90.

Assets Outside of the Scenario Filter

  • Pavement segment 4
    • Length: 1,000 feet
    • Estimated OCI: 20

No activity applied since the asset is not part of the scenario. Ending OCI is 10 as the asset naturally declines over time.

Since some of the pavement segments are in feet and one is in meters, all pavement segments are converted to the default quantity type, which is feet.

Scenario Estimated OCI Calculation

The total length of the three pavement records making up the scenario is 160 feet.

The ending scenario estimated OCI is calculated as follows:

  • (Sum(pavement length * ending oci) ) / total pavement length

  • (10 * 80) + (50 * 70) + (100 * 90)  / 160 = 83.125

The scenario ending estimated OCI is 83.125.

Network Estimated OCI Calculation

  • The total length of the four pavement records making up the scenario is 170 feet.
  • The ending network estimated OCI is calculated as follows:
    • (Sum(pavement length * ending oci) ) / total pavement length
    • (10 * 80) + (50 * 70) + (100 * 90) + (1000 * 10) / 1160 = 20.086

The network ending estimated OCI for the scenario is 20.086.

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