basin-wide approach to souris river floodplain management · basin-wide approach to souris river...
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Basin-wide approach to Souris River floodplain management
Adam Howard, PE, CFM
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overview
• the Souris River
• history of flooding and flood mitigation projects
• response to 2011 flood
• basin-wide management tools
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Souris River
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Souris River
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flood mitigation projects have been
constructed in response to past flood events
1970’s
USACE federal
levee project
1957
Boundary Dam
constructed
1994
Rafferty & Alameda
dams constructed
1930’s
Wildlife Refuge
dams constructed
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several reservoirs provide flood storage
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Boundary, Rafferty and Alameda dams
USGS / photo by: Joel M Galloway USGS / photo by: Joel M Galloway
USGS / photo by: Joel M Galloway
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Lake Darling stores water for the J. Clark Salyer
national wildlife refuge and provides flood storage
USGS / photo by: Joel M Galloway
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Reservoirs are managed to limit flows through
Minot to the design flood if possible
levee system
designed for
5,000 cfs
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spring flooding filled the reservoirs and saturated the
watershed – then it rained… a lot
closed all but two Minot
bridge crossings
displaced over
11,000 people
flooded over
4,300 structures
caused over $1.4B
in damages
~27,000 cfs
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bridge closures limited transportation connectivity
FEMA / photo by: Andrea Booher
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FEMA / photo by: Andrea Booher
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FEMA / photo by: Andrea Booher
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local stakeholders are determined to protect their
community from a 2011 magnitude event
FEMA / photo by: Andrea Booher
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state and local leaders recognized that the
system needed a basin-wide approach
• State / Region• North Dakota State Water
Commission (NDSWC)• Souris River Joint Water
Resources Board (SJRB)• Saskatchewan Water Security
Agency (WSA)
• Federal• US Army Corps of Engineers
(USACE)• FEMA• US Fish and Wildlife (USFW)
• Local• Minot• Burlington• Velva• Sawyer• Rural landowners
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objectives for a basin-wide approach
• reduce flood risk in the Souris River Valley
• understand the watershed as a system
• maintain broad stakeholder support
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response to 2011 flood
structural projects in developed areas
reservoir operations rural alternatives assessment
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Preliminary Engineering Report establish a
project footprint for developed areas
structural projects in developed areas
rural alternatives assessment
reservoir operations
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stakeholder objectives for structural projects
• 3 feet of freeboard above flood of record
• minimize loss of housing
• improve transportation connectivity
• no-adverse impact to base flood profile
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levee floodwall projects for developed
areas along the Souris River
Burlington
VelvaSawyer
Minot
Mouse
River
Park
Subdivisions
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high flow diversions minimized loss of
housing in Minot
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reservoir operations need to balance water
supply needs with flood mitigation
structural projects in developed areas
reservoir operations rural alternatives assessment
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review of reservoir operation plans
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rural alternatives assessment focused on
frequent flooding of ag lands
structural projects in developed areas
reservoir operations rural alternatives assessment
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historic flood analysis evaluated stream
gage records to identify flood sources
2,600 cfs
2,670 cfs
3,200 cfs
2,960 cfs
6,770 cfs
1999 summer flood
March August
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rural alternatives assessment for
addressing summer flooding in rural areas
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hydrologic & hydraulic modeling tool
development
• HEC-HMS hydrologic model
•ungaged areas in North Dakota
• HEC-RAS unsteady flow hydraulic models
•North Dakota
• Saskatchewan
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HEC-HMS model was calibrated to
the historic flood events
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prairie potholes can create significant
non-contributing drainage areas
USGS / photo by: Joel M Galloway
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HEC-RAS unsteady flow models allow
dynamic routing of flood hydrographs
North Dakota model was
calibrated to flood events
from 2009, 2010, and 2011
Canadian model was calibrated
to the 2011 flood event
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application of modeling tools
project impacts
diversion operations
flood forecasting
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what’s next?
• design and permitting of structural projects
• Corps is preparing for the next flood fight
• FEMA is preparing Risk MAP products
• negotiations on international agreement for reservoir operations