EP 1110-2-11
30 Nov 94
proper application rate on the test areas, and during subsequent measurement to evaluate the effectiveness of the program.
Dusting was performed using coal ash and slag from a local power plant.
c. Two periods of breakup occurred in March 1979. Because the dusted ice had already started to deteriorate, the
jams were minor, even following heavy rains. The ice and water flowed smoothly down the channel with no flood dam-
ages (USACE 1979).
d. Similar dusting operations were repeated in March 1994, prompted by severe ice jam flooding in the spring of
1993 that threatened the water wells supplying the city of Lincoln, NE (USACE 1994).
5-7. Allagash, ME - Floodproofing, Relocation
a. Rainfall and 5 to 6 days of mild temperatures resulted in breakup ice jams and severe flooding on the St. John,
Little Black, Allagash, and Aroostook Rivers in April 1991. In Allagash, two bridges and 11 homes on the St. John
River were destroyed. Twenty-two other homes suffered damages. A 304.8-m (1,000-ft) section of a state highway was
washed away. Ice jam flooding also caused evacuations and damage to 16 homes in neighboring towns. Damages
totaled more than million, mostly for rebuilding bridges, roads, and other public works (FEMA 1991).
b. Raising the affected buildings was considered. However, it was determined that elevation of the ground floor of
homes to meet the requirements of the National Flood Insurance Program and local floodplain regulations might not pro-
vide adequate protection from future ice jams. In the town of Dickey, several residents indicated a willingness to relocate
outside the floodplain. The following permanent settlement changes were made:
(1) Three new homes were built at higher elevations on the original lots, and one home was repaired and moved to
higher ground on the same lot.
(2) Two new homes were constructed on new sites outside the floodplain, three homes were repaired and were
moved to higher ground outside the floodplain, and two destroyed homes were replaced with mobile homes on higher
sites.
(3) Thirteen wells and/or septic systems were replaced with mitigation measures, meaning they were floodproofed or
moved to higher ground.
5-6
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