southside flood protection red river channel extension september 15, 2008

Southside FloodProtection

Red River Channel Extension

September 15, 2008

1997 Spring Flood –Fargo, Moorhead

Rose Coulee

Red River

Fargo

50th Avenue South

Moorhead

Univ

ers

ity D

rive

1997 Spring Flood – South of Fargo

Rose CouleeRed River

25th S

treet

Sou

th

Fargo

University DriveMoorhead

60th Ave. SW

Preliminary 100 & 500 Year

Floodplains

Oxbow

Horace

MoorheadWest Fargo

FargoInterstate Hwy 94

Inte

rsta

te H

wy 2

9

Southside Flood

Control

RED RIVER AT FARGO - USGS GAGING STATIONHISTORICAL FLOOD DATA

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

Years of Record

50 Year Discharge - 22,300 CFS

10 Year Discharge - 10,300 CFS

100 Year Discharge - 29,300 CFS

Pea

k D

isch

arge

(CFS)

1997 Spring Flood - 28,000 CFS

Southside Flood Control

North Dakota State Climate Office

• FEMA levees with and without diversion channels

• Channel extensions(Red River & drain improvements)

• Storage inside of project

• Storage in upstream watershed

Project Flood Control Methods

Base Project

Southside Flood

Control

Wild Rice River Levee Alternative

Issues Raised With Base Alternatives• Red River & Wild Rice River impacts

(Higher flood levels)

• Lost storage (Concern storage impact will simply move impacts upstream)

• Properties east of Hwy 81 and upstream receive no protection

CHANNEL EXTENSION AND

STORAGE SUMMARYExisting effective storage 6,000 Acre-Ft

Base project 0 Acre-Ft

Channel extension/storage 2,000 Acre-Ft

Supplemental storage 4,000 Acre-Ft

Southside Flood

Control

North Dakota

Minnesota

Red River

Red RiverChannel

Extension

Typical Red River Cross-Section

SOUTHSIDE FLOOD CONTROL

Wild Rice River Levees Alternative – Red River Impacts

SOUTHSIDE FLOOD CONTROL

Wild Rice River Levees Alternative – Red River Impacts

Red River Flood Timing

Red River - Average Channel Velocity Comparison

Wild

Ric

e R

iver

Cas

s H

wy

16 B

ridge

Mai

n A

ve B

ridge

Inte

rsta

te 9

4

Ros

e C

oule

e

Bria

rwoo

d

76th

Ave

nue

Sou

th

Cas

s H

wy

18 B

ridge

52nd

Ave

Bri

dge

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

450.00 455.00 460.00 465.00 470.00 475.00 480.00 485.00 490.00

River Miles

Ave

rag

e C

han

nel

Vel

oci

tyProject Existing

0.36 fps

Red River - Average Channel Velocity Change

Wild

Ric

e R

iver

Cas

s H

wy

16 B

ridge

Mai

n A

ve B

ridge

Inte

rsta

te 9

4

Ros

e C

oule

e

Bria

rwoo

d

76th

Ave

nue

Sou

th

Cas

s H

wy

18 B

ridge

52nd

Ave

Bri

dge

-0.100

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

450.00 455.00 460.00 465.00 470.00 475.00 480.00 485.00 490.00

River Miles

Vel

oci

ty C

han

ge

- F

eet

per

Sec

on

d

Red River - 100 Year Flood - 52nd Ave So.

885

890

895

900

905

9103/

24

3/26

3/28

3/30 4/

1

4/3

4/5

4/7

4/9

4/11

4/13

4/15

4/17

Wat

er S

urfa

ce E

leva

tion

ExistingProject

Red River - 100 Year Flood - 52nd Ave S./60th Avenue SW

906.0

906.5

907.0

907.5

908.04/

1

4/3

4/5

4/7

4/9

Wat

er S

urfa

ce E

leva

tion

Existing

Levees Only

Project26 Hours

3.2 Inches

1997 Spring Flood – South of Fargo

Rose CouleeRed River

25th S

treet

Sou

th

Fargo

University DriveMoorhead

Southside Flood Control

Red River Channel

Extension Options

Southside Flood Control

Technical Committee Preferred Option:

North Dakota Alignment

Southside FloodProtection

Red River Channel Extension Fly Through

Southside Flood

Control

Technical Committee Preferred

Alignments

1997 Spring Flood – South of Fargo

Interstate 29

Cass

Co

Hw

y 81

25th Street S

outh

Project ScheduleDevelopment of options east of University Drive April-June 2008

City Commission Selection of preferred base alternative

July 14, 2008

Public input meetings April 15 - September 2008

Environmental Assessment July – December 2008

Consultant Selection July - December 2008

Begin Design December 2008

CLOMR Submittal July – December 2008

CLOMR Approval March 2009

ROW Acquisitions October 2008 – October 2009

Permitting September 2008 – April 2009

Special Assessment District September – December 2008

Begin Construction June 2009

Functional Completion March 2011

Final Completion July 2012

Questions / Discussion

Southside Flood Control