Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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1. AGENCY USE ONLY (Leave blank)
2. REPORT DATE
3. REPORT TYPE AND DATES COVERED
January 1996
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Ice Jam Flooding and Mitigation: Lower Platte River Basin, Nebraska
6. AUTHORS
Kathleen D. White and Roger L. Kay
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION
REPORT NUMBER
U.S. Army Cold Regions Research and Engineering Laboratory
72 Lyme Road
Special Report 96-1
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
U.S. Army Engineer District, Omaha
State of Nebraska Governor's Emergency Fund
State of Nebraska Natural Resources Commission
11. SUPPLEMENTARY NOTES
12a. DISTRIBUTION/AVAILABILITY STATEMENT
12b. DISTRIBUTION CODE
Approved for public release; distribution is unlimited.
Available from NTIS, Springfield, Virginia 22161
13. ABSTRACT (Maximum 200 words)
This report presents the results of the Corps of Engineers' Section 22 study of ice jam flooding in the Lower Platte
River basin. The purpose of the study was to gather and analyze historical data relating to ice jams, with the intent
of developing guidance that can be used to alleviate ice jam flooding at seven sites within the study area. Ice event
and related information is summarized for each site. Ice event characteristics for the study area are identified and
analyzed. A model for predicting the occurrence of ice jams or other ice events within the study area was
developed based on data for the Platte River at North Bend, Nebraska. The model provides the minimum
discharge associated with ice events for a given date, assuming a threshold value of accumulated freezing degree-
days has been reached. A data collection program for future field observations was developed and placed in
operation during the winter of 1993-94. General information on ice jam mitigation measures, as well as specific
information on such operations as dusting and blasting, is provided. Specific recommendations include increased
monitoring of ice conditions, installation of ice motion detectors and water stage recorders, and further study of
nonstructural and structural mitigation measures. The use of dusting and blasting as mitigation measures is also
presented. The study was divided into six phases. Phase 1 involved collection of historical information from all
available data sources, published and oral. Site visits were made to each identified site. Phase 2 entailed analysis
and assessment of the collected hydrological, hydraulical, meteorological and ice data. Aerial reconnaissance of
14. SUBJECT TERMS
15. NUMBER OF PAGES
93
Ice jams
Flooding
Platte River
16. PRICE CODE
17. SECURITY CLASSIFICATION
18. SECURITY CLASSIFICATION
19. SECURITY CLASSIFICATION
20. LIMITATION OF ABSTRACT
OF REPORT
OF THIS PAGE
OF ABSTRACT
UNCLASSIFIED
UNCLASSIFIED
UNCLASSIFIED
UL
Standard Form 298 (Rev. 2-89)
NSN 7540-01-280-5500
Prescribed by ANSI Std. Z39-18
298-102
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