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PAPILLION CREEK AND TRIBUTARIES LAKES, NEBRASKA … · law 97-88) House Report No. 97-177 authorized a reevaluation of the Papillion Creek and Tributaries Lakes, Nebraska Report 2.
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“The views, opinions and findings contained in this report are
those of the authors(s) and should not be construed as an
official Department of the Army position, policy or decision,
unless so designated by other official documentation.”
PAPILLION CREEK AND
TRIBUTARIES LAKES, NEBRASKA
GENERAL REEVALUATION STUDY
Public Meeting
July 23, 2019
FOUO/FOR DISCUSSION
Tiffany Vanosdall
Project Manager, USACE
BACKGROUND
• Papillion Creek and Tributaries Lakes, Nebraska, a comprehensive plan
to reduce flood risks for the Papillion Creek basin, was authorized in the
Flood Control Act of 1968 and consisted of 21 dams for flood control,
recreation, and water quality.
• only 4 of the original 21 dams were constructed as part of the federal
project
• updated in the 1980s to substitute some channel improvements and
levees to address localized risks in specific reaches
• 4 dams and 6 levee systems comprising the federal project are owned
and operated by local sponsors
• additional dams, detention basins, and non-federal levee systems have
been constructed
• The Energy and Water Development Appropriation Act, 1982 (public
law 97-88) House Report No. 97-177 authorized a reevaluation of the
Papillion Creek and Tributaries Lakes, Nebraska Report
2
GOAL
• Reduce flood damage and risk to life safety in the
Papillion Creek watershed
3
STUDY AREA4
TYPES OF ALTERNATIVES CONSIDERED 5
Channel Improvements LeveesFloodwall
ReservoirsElevationFloodproofing
ALTERNATIVES CONSIDERED
• West Papillion Creek• Channel Widening (144th St
to RR Bridge)
• Levee Raise (96th St to
confluence)
• Dam Site 12
• Nonstructural Measures
South Papillion Creek• Channel Widening (156th St
to confluence)
• Dam Site 19
• Nonstructural Measures
6
ALTERNATIVES CONSIDERED
• Little Papillion Creek• Channel Widening (Maple St
to Grover St)
• Levee Construction/Floodwall
(Cass St to Center St)
• Levee Modification (Big
Papillion Creek confluence)
• Dam Site 10 on Thomas
Creek
• Nonstructural Measures
7
ALTERNATIVES CONSIDERED
• Big Papillion Creek• Channel Widening (Blondo St
to West Center Rd)
• Channel Widening/Levee
Raise Combination (Center St
to L St)
• Levee Raise (L St to West
Papillion Confluence)
• Dam Sites W, 7, 8a, 9a
• Nonstructural Measures
8
METHOD OF EVALUATION
Calculate Benefits
• HEC-HMS (Hydrology)
• HEC-RAS (Hydraulics)
• HEC-FDA (Economics)
9
Estimate Costs
• Construction
• Real estate
• Mitigation requirements
Flood damages
to existing
homes and
businesses
Flood damages
to roads and
infrastructure
ALTERNATIVES CARRIED FORWARD
• West Papillion Creek• Floodwall (144th St to Q St)