SENA Lake Hiawatha Meeting Presentation
-
Upload
lautenschlager -
Category
Documents
-
view
6 -
download
0
description
Transcript of SENA Lake Hiawatha Meeting Presentation
CITY OF MINNEAPOLIS
Standish‐Ericcson Neighborhood Association Community Discussion
Lake Hiawatha Recreation CenterDecember 9, 2015
1
Presenters
• City of Minneapolis Department of Public WorksLisa Cerney, PE Director, Surface Water & Sewers Division
• Minneapolis Park & Recreation BoardRachael Crabb, Water Quality Supervisor
• Minnehaha Creek Watershed DistrictBecky Christopher, Lead Planner and Project Manager
2
The Big Picture
3
Drainage to Lake Hiawatha includes parts of Minneapolis and parts of cities upstream that drain to Minnehaha Creek
Approximate size and population of drainage area to Minnehaha Creek
Size Population7.5 million acres 340,000
LakePowderhorn
Lake Nokomis
Lake Hiawatha
Six drainage areas through storm pipes to the outfalls
Six pipe outfalls to lake
Approximate size and population of drainage areas direct to Lake Hiawatha
Size Population900+ acres 12,000 140 acres 1,000 85 acres 7008 acres 905 acres 402.5 acres 20
LEGEND
Creek flow into lake
Bancroft Meadows Flood Basin (Bloomington and 42nd )
Built 1989
1
LakePowderhorn
Lake Nokomis
Lake Hiawatha
1
Sibley Field Flood Basin (next to Sibley Field Park)
Built 1990
2
LakePowderhorn
Lake Nokomis
Lake Hiawatha
1
2
Lake Hiawatha
37th & Columbus 2‐Cell Flood Basin
Built 2003
3
Dry Cell
LakePowderhorn
Lake Nokomis
1
2
3
Wet Cell
Blue Water Partnership Rain Garden(E 43rd Street and 20th Avenue S )
Built 2012
4
Lake Hiawatha
LakePowderhorn
Lake Nokomis
1
2
3
4
Annual City Programs
Street Sweeping
Annual City Programs
Inspecting Outfalls
Annual City Programs
Catch Basin StencilingBy Volunteers
Annual City Programs
NEW in 2016!Adopt‐A‐Catch Basin Program
Storm drains and catch basins are designed for rain and snowmelt – not leaves, grass clippings, trash or oil.
1. Sweep or rake the debris from area around grate, and dispose of in the trash.
2. If debris is lodged in the grate ‐ or visible under the grate inside the catch basin – don’t tackle this yourself. Contact 311 for City crews to clean out.
2
1
2
Lake Hiawatha: Then and NowRachael Crabb
Minneapolis Park & Recreation Board
1850’s Era South Minneapolis
1956
MPRB Water Monitoring Activities since 1992
• Lake Levels• Nutrients (phosphorus, nitrogen)• Clarity (secchi depth, chloroplyll)• Physical parameters (temp., pH, conductivity)• Beach Monitoring• Phytoplankton and Zooplankton species• Aquatic plant species and abundance• Zebra mussel monitoring(since 2010)
809
810
811
812
813
814
815
816
817
1995 2000 2005 2010 2015
Ele
vatio
n (m
sl)
Year
Lake Hiawatha OutletElevation (OHW) = 812.8…
Trophic State Index (TSI)• Index that combines phosphorus, Secchi (clarity), and chlorophyll data calculated
in order to characterize a lake’s overall “health”.
• Higher scores indicate more algal biomass, lower scores indicate clearer water.
Hiawatha TSI – Drought Years Highlighted
Beach Bacteria Monitoring
• Weekly monitoring during swim season• “double trigger” for closure
– Single sample over 1260 cfu– Geometric mean over 126
• Multiple sources (humans, pets, animals, creek, stormwater)
• Minnehaha Creek TMDL – long term project
No waterborne outbreaks ever in MPRB system
Beach Issues
Recent Projects at Hiawatha
Minnehaha Creek Influence on Lake Hiawatha
Becky ChristopherMinnehaha Creek Watershed District
Total Maximum Daily Load (TMDL) Study
Total Maximum Daily Load (TMDL) Study
Upstream Improvements
Upstream Improvements
What Can You Do?• Source control:
• Keep stormwater where it lands• Clean up leaves, grass clippings, and trash in streets and alleys
• Specific program/events:• Annual Creek Clean‐up – July 24, 2016• Cost share grants
• http://www.minnehahacreek.org/grants• Become a Master Water Steward
• http://masterwaterstewards.org/• December 15 deadline
• Sign up for Splash e‐newsletter