1. Overview
  2. Project Identification Information
  3. Human Impacts
  4. Economic Impacts
  5. Impact on Critical Functions

Facility Data

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Overview

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Provide today's date and name for the prioritization.

Project Identification Information

General Asset Details

Please provide the Dam name and any other useful asset information for the facility data.

Guidance for Parameter Data

Use an estimated data point if it is available, and enter it in the box on the left. The associated range will autofill the right-hand box. If you do not have data for any or all parameters, you can still provide an approximate range by using the dropdown menu in the right-hand box and leaving the left-hand box blank. If you plan to use continuous scaling, you must provide an estimated value.

Human Impacts

Impacts on human health and safety caused by inundation of downstream populated areas, industrial areas, and other critical infrastructure assets.

Total Population at Risk

Provide an estimated value for the Total Population at Risk (PART) within the flood inundation zone.
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For the purposes of this methodology, the Population at Risk (PAR) is the estimated number of humans occupying a permanent residence, commercial building, or recreational area in the potential zone of inundation represented by a dam breach flood scenario.

The Total Population at Risk (PART) can be determined by using site-specific inundation maps prepared for the dam. This map provides an estimation of the boundary of the inundation zone, and must be of a scale sufficient to locate all permanent structures and population within it. Recent census data can be used to estimate the number of persons within the entire inundation zone. Since the approach is based on a worst reasonable case scenario, any persons using recreational facilities within the zone should also be considered, including times of high use such as holidays or special sporting or other types of events that attract large crowds.

  • For unusual cases, such as pump storage facilities that are not fed by a river or other natural means, the toe of the dam shall be considered to be the most critical location around the walled peripheral of the reservoir with the highest PAR in the event of its breach.
  • Total Population at Risk (PART) should include all potential populations at risk within the expected downstream inundation area, which typically extends to a distance where the estimated change in water depth is less than two feet.
  • Close range populations at risk breaks out the PAR into different downstream distances. Although the sum of close range PARs may equal Total PAR, this does not need to be true, as there may be additional PAR that fall outside of the close range considerations.
  • It should be emphasized that PAR does not represent the expected loss of life, but rather the number of residents impacted by a possible flood scenario from dam failure. The number of expected deaths from a dam-break may be significantly less than the PAR and is dependent on many factors, including a) time of warning, b) depth of flooding, c) velocity of flood wave, etc.

Close Range Population at Risk

Provide estimated values for the population within different downstream distance ranges from the toe of the dam.

Economic Impacts

Impacts associated with damages to the facility, direct damage to downstream inundated areas, and direct monetary impacts associated with lost project benefits.
Provide estimates based on the worst reasonable case scenario, which will often, but not always, represent some form of catastrophic failure. This section refers only to economic losses as measured in US Dollars.
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For purposes of this estimation, the dam-break flood condition is likely to be the initiating case, although site-specific studies may show variations. The scenario resulting in maximum economic losses should be used, which may differ from the scenario that can cause the greatest human impact. All pertinent structures of value located within the downstream inundation zone should be considered. The estimation should be made as to whether they would be damaged or destroyed based on expert judgment and prior case histories of dam failure incidents. If in doubt, total destruction of affected structures should be used. The highest value property losses may not necessarily correspond to the maximum number of buildings and equipment. For example, a central control building or switch gear room at a dam is likely to have a much higher replacement cost value than a maintenance shop or warehouse.

Impact on Critical Functions

Secondary effects associated with the disruption or loss of the critical functions provided by the facility.
The failure or disruption of the facility may severely impact essential services or critical functions that affect populated centers, industrial areas, agricultural regions, flood protected areas, or inland navigation systems. The data provided here represents an estimation of the relative importance (in terms of size or capacity) of the critical functions provided by a project.

If you would like to save your data and continue at a later date, you may export your information at anytime by saving to a local drive. Note: All exported and imported data must be in .json format.

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