ASDSO Dam Safety Toolbox

Permanent Impacts vs. Temporary Impacts

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In evaluating impacts to wetlands and other cultural/environmental features, regulations often require the delineation of permanent impacts and temporary impacts. For example, temporary impacts to wetlands and habitats may result from drawdown of a reservoir below its normal operating level in order to facilitate construction. Conversely, permanent impacts to wetlands and habitats may result from a spillway modification that raises the normal operating level of a reservoir as a means of increasing storage. Temporary impacts may require some restoration after a construction project is complete, but would generally be expected to recover to their pre-project state. Permanent impacts likely will require other mitigation measures to offset the permanent loss of the resource.


Revision ID: 5827
Revision Date: 12/16/2022