EP 1110-2-11
30 Nov 94
peaking plants may initiate ice breakup and subsequent jamming. On the other hand, wise reservoir regulation during
freezeup or breakup periods can reduce ice jam flood risks.
g. Removing or building a dam may cause problems. In many parts of the country, small dams that once
functioned for hydropower have fallen into disrepair. Communities may remove them as part of a beautification scheme
or to improve fish habitat. However, the effects of an existing dam on ice conditions should be considered before remov-
ing or substantially altering an existing dam. It is possible that the old dams provide ice control by delaying ice breakup
or providing storage for ice debris. Dam construction can also affect ice conditions in a river by creating a jam initiation
point. On the other hand, the presence of a dam and its pool may be beneficial if frazil ice production and transport
decrease as a result of ice cover growth on the pool.
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