HomeMy WebLinkAboutSawyer_Creek_Public_Information_Meeting_Presentation1
City of Oshkosh
Stormwater Management
Public Information MeetingsPublic Information Meetings
Sawyer Creek WatershedSawyer Creek Watershed
September 15 & 17, 2009September 15 & 17, 2009
Room 404 / 406, City HallRoom 404 / 406, City Hall
2
Overview
• Sawyer Creek Storm Water Management Plan
• Combined Mitigation Strategies for Sawyer Creek
and Campbell Creek Watersheds
• Water Quality Analysis
• Options Analysis
• Future Direction from Common Council
3
Sawyer Creek
4
• Reduce or eliminate street flooding to the maximum extent practicable.
• Reduce 100-year floodplain elevations to remove habitable buildings
from the 100-year floodplain, where possible.
• Culverts/Bridges at street crossings should convey stormwater runoff
from a 100-year storm event without roadway overtopping, where
possible. If this is not possible, provide passage of the greatest storm
event possible (25-year to 50-year being desirable).
• Stormwater management practices to be employed should improve
stormwater quality by reducing the amount of suspended solids and
attached nutrients in the runoff to the maximum extent practicable.
Sawyer Creek Plan Goals
5
Sawyer Creek Existing Conditions
Flooding Analysis Points:
1150 South Oakwood Road
Mercy Medical Generator
729 North Washburn Street
1020 North Westfield Street
1036 North Lark Street
Mercy Medical Center
(Looking North from 9th)
Oakwood Road (Looking
East from Ruschfield)
Kienast Bridge
(Looking West)
US
H
4
1
STH 21
6
Sawyer Creek Existing Conditions
100Sawyer Street
50-100Westfield Drive
100USH 41 and Frontage Roads
5-10Naslund Residence
5-10Pommerening Residence
25-50Westhaven Drive
25-50West 9th Avenue
25-50Oakwood Road
<2Pedestrian Bridge 1
<2Pedestrian Bridge 2
25-50Clairville / CTH K
Approximate Overtopping
Frequency (Design Storm
Event)
Roadway Crossing
Bridge Overtopping Frequency
7
Considered Detention
•Vacant Land N.E. of Clairville/W. 20th
•Vacant Land (17.1 Ac) N. of Mercy
•Vacant Land (14.1 Ac) W. of Fleet Farm
•Vacant Area S. of Meadow Park Dr. and W.
of Badger/Oakwood intersection
•Various Locations in Rural Watersheds
Upstream of Clairville
Sawyer Creek Alternatives Analysis
US
H
4
1
STH 21
STH 44
8
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
• Sawyer Creek
– Alternatives 6 and 7 have best performance based upon
flood reduction.
• Alternative 6 impacts Westhaven Golf Course
• Alternative 7 does not impact Westhaven Golf Course
• Campbell Creek
– Alternatives 12 and 13B have best performance based
upon flood reduction
• Alternative 13B impacts Westhaven Golf Course
• Alternative 12 does not impact Westhaven Golf Course
9
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
• Impacting Westhaven
– James Road / STH 91
– Oakwood Road
– Sawyer Creek Dredging
– Tipler Middle School
– Armory
– Westhaven Golf Course
• Not Impacting Westhaven
– James Road / STH 91
– Oakwood Road
– Sawyer Creek Dredging
– Tipler Middle School
– Expanded Armory
– 9th & Washburn
Options for Managing Stormwater
10
James Road / STH 91 Detention Basin
US
H
4
1
STH 21
STH 44
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
11
Oakwood Road Detention Basin
(Southwest Industrial Park)
US
H
4
1
STH 21
STH 44
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
12
Sawyer Creek Dredging – Westfield Street Locale
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
13
Tipler Middle School Dry Detention Basin
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
14
Westhaven East
Westhaven West
Sawyer Creek
Westhaven East
Westhaven West
Campbell Creek
Westhaven Golf Course
Detention Basins
US
H
4
1
STH 21
STH 44
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
15
Westhaven Golf Course
Detention Basins
Golf Course Operations are
Retained
Oa
k
w
o
o
d
R
o
a
d
9th Avenue
W
e
s
t
h
a
v
e
n
D
r
i
v
e
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
16
Armory Detention Basin
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
17
Expanded Armory Detention Basin
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
18
9th and Washburn Detention Basin
Combined Mitigation Strategies for Sawyer
Creek and Campbell Creek Watersheds
19
Water Quality Analysis
• Wisconsin DNR Storm Water Discharge Permit
Coverage issued on January 2, 2007
• Permit requires reduction of pollution to waters
of the state
• Pollutant of Interest: Total Suspended Solids
(TSS)
• Must reduce Base Load by 40% by 2013
20
0
100
200
300
400
500
600
700
Storage
Provided (ac-ft)
Without
Westhaven
With
Westhaven
Options Analysis
0
10000
20000
30000
40000
50000
60000
70000
Cost per ac-ft
Without
Westhaven
With
Westhaven
21
Options Analysis
200
250
300
350
400
450
500
550
600
100-year Flood
Plain (acres)
Existing
Without
Westhaven
With
Westhaven
1000
1200
1400
1600
1800
2000
2200
Dwelling Units
within Flood
Plain
Existing
Without
Westhaven
With
Westhaven
22
Options Analysis
6
7
8
9
10
11
12
13
Miles of Street
within Flood
Plain
Existing
Without
Westhaven
With
Westhaven
0
10
20
30
40
50
60
70
80
90
Tons TSS
Removed
Existing
Without
Westhaven
With
Westhaven
23
Summary
Options Analysis
NA
12.37
2,182
683
$ 265,778,500
591
NA
NA
Existing Conditions
1,2951,535
Number of Dwelling Units
within City within 100-year
Flood Plain
$ 36,664,169$ 25,217,169Project Cost
6.408.19Miles of Streets within 100-
year Flood Plain
410496
Number of Residential City
Parcels within 100-year Flood
Plain
$ 176,244,500$ 192,006,500Estimated City Parcel Value
in 100-year Flood Plain
359385100-year Flood Plain Area
(ac)
80.926.6Total TSS Removed
(tons/year)
Storage Provided (ac-ft)677.6365.5
Impacting WesthavenNot Impacting Westhaven
To make up the pollution reduction difference between the two options, approximately 460 acres of Commercial, Industrial
and Institutional Land would require treatment with Bio-filters. The estimated construction cost would be $4.2 million, with
estimated annual maintenance costs of $620,000 vs. $28,000 for the detention basins.
24
Future Direction from Common Council
• To utilize Westhaven Golf Course, or not.
• To begin implementation of Sawyer Creek
Storm Water Management Plan.
25
Discussion